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, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 10 $ 12  
Net actuarial loss 3,002 2,666  
Service cost 112 104 $ 124
Interest cost 235 291 296
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (587) (552) (650)
Amortization of prior service cost (credit) 3 (4) (3)
Defined Benefit Plan, Amortization of Gain (Loss) 171 151 128
Net periodic benefit cost (66) (10) (105)
Settlement charge 23 6 240
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 1 0 5
Special termination benefits 2 1 7
Defined Benefit Plan, Other Cost (Credit) (4) 1 0
Total cost recognized in the statement of income (44) (2) 147
Changes in AOCI for our benefit plans, pretax      
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax (2,678) (2,482)  
Recognized net actuarial loss (gain) 195 157  
Prior service credit (cost) arising in the current year (3) 1  
Net actuarial (loss) gain arising in the current year (488) (370)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax 3 (4)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax $ (3,012) $ (2,678) $ (2,482)
Weighted average assumptions used in computing the benefit obligations      
Discount rate (as a percent) 2.50% 3.25%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate 3.00% 3.50%  
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) 3.25% 4.00% 3.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate 3.50% 3.75% 3.25%
Rate of increase in compensation levels (as a percent) 3.75% 3.75% 3.50%
Expected Long-term Rate of Return on Plan Assets 7.50% 7.75% 8.00%
Other Comprehensive Income Defined Benefit Plans, Net Translation Gain (Loss) Arising During Period before Tax $ (41) $ 20  
Pension benefits | Curtailment charges (credits) [Member]      
Changes in AOCI for our benefit plans, pretax      
Net actuarial (loss) gain arising in the current year (15)    
Pension benefits | Impact of settlements [Member]      
Changes in AOCI for our benefit plans, pretax      
Recognized net actuarial loss (gain) (23)    
Other benefits      
Net periodic pension and other Postretirement benefit cost      
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax (17) (23)  
Net actuarial loss 64 82  
Service cost 11 9 $ 11
Interest cost 21 28 25
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (16) (13) (13)
Amortization of prior service cost (credit) (3) (2) (14)
Defined Benefit Plan, Amortization of Gain (Loss) 5 2 3
Net periodic benefit cost 18 24 12
Settlement charge 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 6 (2) (4)
Special termination benefits 0 0 0
Defined Benefit Plan, Other Cost (Credit) 0 0 (1)
Total cost recognized in the statement of income 24 22 7
Changes in AOCI for our benefit plans, pretax      
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax (59) (15)  
Recognized net actuarial loss (gain) 11 2  
Prior service credit (cost) arising in the current year 0 0  
Net actuarial (loss) gain arising in the current year 7 (44)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax (3) (4)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax $ (47) $ (59) $ (15)
Weighted average assumptions used in computing the benefit obligations      
Discount rate (as a percent) 2.75% 3.50%  
Weighted-average assumptions used in computing net periodic benefit cost      
Discount rate (as a percent) 3.50% 4.25% 3.50%
Expected Long-term Rate of Return on Plan Assets 4.50% 4.50% 4.50%
Other Comprehensive Income Defined Benefit Plans, Net Translation Gain (Loss) Arising During Period before Tax $ (3) $ 2  
Domestic Plan      
Weighted-average assumptions used in computing net periodic benefit cost      
Rate of increase in compensation levels (as a percent) 7.50%    
The 5-year annualized return on plan assets (as a percent) 10.20%    
The 10-year annualized return on plan assets (as a percent) 8.40%    
The 15-year annualized return on plan assets (as a percent) 6.90%    
Annualized return on plan assets since inception (as a percent) 10.50%