Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details 4)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net periodic pension and other Postretirement benefit cost      
Corridor Approach for Amortizing Actuarial Gains and Losses 10.00%    
Pension benefits      
Net periodic pension and other Postretirement benefit cost      
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax $ (12) $ (10)  
Defined Benefit Plan, Plan Assets, Payment for Settlement 892 794  
Service cost 124 197 $ 239
Interest cost 294 306 319
Expected return on plan assets (650) (650) (653)
Amortization of prior service cost (credit) (3) 0 (2)
Amortization of actuarial loss 128 175 183
Net periodic benefit cost (107) 28 86
Settlement charge 240 228 118
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 5 4 0
Special termination benefits 7 106 37
Defined Benefit Plan, Other Cost (Credit) 0 1 (3)
Total cost recognized in the statement of income 145 367 238
Changes in AOCI for our benefit plans, pretax      
Beginning balance in AOCI (2,493) (2,932)  
Prior service credit (cost) arising in the current year (1) (1)  
Net actuarial (loss) gain arising in the current year (389) 75  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax 1 4  
Recognized net actuarial loss (gain) 369 403  
Ending balance in AOCI (2,482) (2,493) $ (2,932)
Net actuarial loss (2,470) $ (2,483)  
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]      
Amounts in AOCI expected to be recognized as component of net periodic pension cost in next fiscal year 148    
Amortization of prior service cost (credit) (4)    
Amortization of actuarial loss $ 152    
Weighted average assumptions used in computing the benefit obligations      
Discount rate (as a percent) 4.00% 3.50%  
Rate of increase in compensation levels (as a percent) 3.75% 3.50%  
Weighted-average assumptions used in computing net periodic benefit cost      
Discount rate (as a percent) 3.50% 4.00% 4.25%
Rate of increase in compensation levels (as a percent) 3.50% 3.75% 3.50%
Other Comprehensive Income Defined Benefit Plans, Net Translation Gain (Loss) Arising During Period before Tax $ 27 $ (42)  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 8.00% 8.00% 8.25%
Pension benefits | Divestitures, deconsolidations and other [Member]      
Changes in AOCI for our benefit plans, pretax      
Net actuarial (loss) gain arising in the current year $ 4 $ 0  
Pension benefits | Curtailment charges (credits) [Member]      
Changes in AOCI for our benefit plans, pretax      
Net actuarial (loss) gain arising in the current year 63    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax 4    
Pension benefits | Impact of settlements [Member]      
Changes in AOCI for our benefit plans, pretax      
Recognized net actuarial loss (gain) 240 228  
Other benefits      
Net periodic pension and other Postretirement benefit cost      
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax 29 36  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Service cost 11 17 $ 22
Interest cost 23 29 31
Expected return on plan assets (13) (12) (11)
Amortization of prior service cost (credit) (14) (18) (19)
Amortization of actuarial loss 3 8 7
Net periodic benefit cost 10 24 30
Settlement charge 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (4) (79) 0
Special termination benefits 0 0 1
Defined Benefit Plan, Other Cost (Credit) (1) 0 23
Total cost recognized in the statement of income 5 (55) 54
Changes in AOCI for our benefit plans, pretax      
Beginning balance in AOCI (26) (48)  
Prior service credit (cost) arising in the current year 8 21  
Net actuarial (loss) gain arising in the current year 15 92  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax (18) (54)  
Recognized net actuarial loss (gain) 3 (36)  
Ending balance in AOCI (15) (26) $ (48)
Net actuarial loss (44) $ (62)  
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]      
Amounts in AOCI expected to be recognized as component of net periodic pension cost in next fiscal year 0    
Amortization of prior service cost (credit) (2)    
Amortization of actuarial loss $ 2    
Weighted average assumptions used in computing the benefit obligations      
Discount rate (as a percent) 4.25% 3.50%  
Weighted-average assumptions used in computing net periodic benefit cost      
Discount rate (as a percent) 3.50% 4.00% 4.25%
Other Comprehensive Income Defined Benefit Plans, Net Translation Gain (Loss) Arising During Period before Tax $ 3 $ (1)  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.50% 4.75% 4.75%
Other benefits | Divestitures, deconsolidations and other [Member]      
Changes in AOCI for our benefit plans, pretax      
Net actuarial (loss) gain arising in the current year $ 0 $ 0  
Other benefits | Curtailment charges (credits) [Member]      
Changes in AOCI for our benefit plans, pretax      
Net actuarial (loss) gain arising in the current year 63 45  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax $ (4) (36)  
Recognized net actuarial loss (gain)   $ (43)  
United States      
Net periodic pension and other Postretirement benefit cost      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Change Due to Subsequent Interim Measurement, Weighted-Average Expected Long-term Rate of Return on Plan Assets 8.00%    
Weighted-average assumptions used in computing net periodic benefit cost      
The 5-year annualized return on plan assets (as a percent) 5.50%    
The 10-year annualized return on plan assets (as a percent) 9.20%    
The 15-year annualized return on plan assets (as a percent) 6.40%    
Annualized return on plan assets since inception (as a percent) 10.30%