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, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 12  
Net actuarial loss 2,666 2,470  
Service cost 104 124 $ 197
Interest cost 291 296 306
Expected return on plan assets 552 650 650
Amortization of prior service cost (credit) (4) (3) 0
Amortization of actuarial loss (151) (128) (175)
Net periodic benefit cost (10) (105) 28
Settlement charge 6 240 228
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 (5) (4)
Special termination benefits 1 7 106
Defined Benefit Plan, Other Cost (Credit) 1 0 1
Total cost recognized in the statement of income (2) 147 367
Changes in AOCI for our benefit plans, pretax      
Beginning balance in AOCI 2,482 2,493  
Recognized net actuarial loss (gain) 157 369  
Prior service credit (cost) arising in the current year 1 (1)  
Net actuarial (loss) gain arising in the current year (370) (386)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax (4) 1  
Ending balance in AOCI 2,678 $ 2,482 $ 2,493
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 171    
Amortization of prior service cost (credit) 0    
Amortization of actuarial loss $ (171)    
Weighted average assumptions used in computing the benefit obligations      
Discount rate (as a percent) 3.25% 4.00%  
Rate of increase in compensation levels (as a percent) 3.75% 3.75%  
Weighted-average assumptions used in computing net periodic benefit cost      
Discount rate (as a percent) 4.00% 3.50% 4.00%
Rate of increase in compensation levels (as a percent) 3.75% 3.50% 3.75%
Expected Long-term Rate of Return on Plan Assets 7.75% 8.00% 8.00%
Other Comprehensive Income Defined Benefit Plans, Net Translation Gain (Loss) Arising During Period before Tax $ 20 $ 24  
Pension benefits | Divestitures, deconsolidations and other [Member]      
Changes in AOCI for our benefit plans, pretax      
Net actuarial (loss) gain arising in the current year 0 4  
Pension benefits | Curtailment charges (credits) [Member]      
Net periodic pension and other Postretirement benefit cost      
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax 2    
Changes in AOCI for our benefit plans, pretax      
Recognized net actuarial loss (gain)   4  
Net actuarial (loss) gain arising in the current year   63  
Pension benefits | Impact of settlements [Member]      
Net periodic pension and other Postretirement benefit cost      
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax 6 240  
Other benefits      
Net periodic pension and other Postretirement benefit cost      
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax (23) (28)  
Net actuarial loss 82 43  
Service cost 9 11 $ 17
Interest cost 28 25 29
Expected return on plan assets 13 13 12
Amortization of prior service cost (credit) (2) (14) (18)
Amortization of actuarial loss (2) (3) (8)
Net periodic benefit cost 24 12 24
Settlement charge 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 2 4 79
Special termination benefits 0 0 0
Defined Benefit Plan, Other Cost (Credit) 0 (1) 0
Total cost recognized in the statement of income 22 7 (55)
Changes in AOCI for our benefit plans, pretax      
Beginning balance in AOCI 15 26  
Recognized net actuarial loss (gain) 2 3  
Prior service credit (cost) arising in the current year 0 8  
Net actuarial (loss) gain arising in the current year (44) 17  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax (4) (18)  
Ending balance in AOCI 59 $ 15 $ 26
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 3    
Amortization of prior service cost (credit) 2    
Amortization of actuarial loss $ (5)    
Weighted average assumptions used in computing the benefit obligations      
Discount rate (as a percent) 3.50% 4.25%  
Weighted-average assumptions used in computing net periodic benefit cost      
Discount rate (as a percent) 4.25% 3.50% 4.00%
Expected Long-term Rate of Return on Plan Assets 4.50% 4.50% 4.75%
Other Comprehensive Income Defined Benefit Plans, Net Translation Gain (Loss) Arising During Period before Tax $ 2 $ 1  
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      
Recognized net actuarial loss (gain) 2 $ 4  
Net actuarial (loss) gain arising in the current year $ 2    
United States      
Weighted-average assumptions used in computing net periodic benefit cost      
Rate of increase in compensation levels (as a percent) 7.75%    
The 5-year annualized return on plan assets (as a percent) 7.40%    
The 10-year annualized return on plan assets (as a percent) 8.90%    
The 15-year annualized return on plan assets (as a percent) 6.70%    
Annualized return on plan assets since inception (as a percent) 10.50%