Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension benefits      
Changes in benefit obligations      
Benefit obligation at January 1 $ 8,757 $ 8,015  
Service cost 112 104 $ 124
Interest cost 235 291 296
Participant Contributions 1 1  
Foreign currency exchange rate changes 67 (28)  
Amendments 3 (1)  
Actuarial loss (gain) 746 931  
Benefits Paid (485) (537)  
Settlements (81) (19)  
Curtailments (15) (2)  
Special termination benefits 2 1 7
Other 72 1  
Benefit obligation at December 31 9,414 8,757 8,015
Accumulated Benefit Obligations 9,263 8,607  
Fair value of plan assets      
Fair value of plan assets at January 1 8,080 7,429  
Actual return on plan assets 830 1,111  
Employer contributions 30 36  
Contributions by Plan Participant 1 1  
Foreign currency exchange rate changes 97 (26)  
Benefits Paid (419) (453)  
Settlements (53) (18)  
Other 73 0  
Fair value of plan assets at December 31 8,639 8,080 7,429
Net liability recognized (775) (677)  
Pension and other benefit amounts recognized in our consolidated balance sheets      
Noncurrent asset 1,151 998  
Current liability (116) (72)  
Long-term liability (1,810) (1,603)  
Net liability recognized (775) (677)  
Accumulated benefit obligations in excess of the fair value of plan assets      
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation 7,722 7,194  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 5,796 5,515  
Accumulated Benefit Obligations 7,553 7,052  
Fair value of plan assets 5,745 5,485  
Pension benefits | Change in Assumptions for Defined Benefit Plans      
Changes in benefit obligations      
Actuarial loss (gain) 491 611  
Other benefits      
Changes in benefit obligations      
Benefit obligation at January 1 757 719  
Service cost 11 9 11
Interest cost 21 28 25
Participant Contributions 12 20  
Foreign currency exchange rate changes (1) (2)  
Amendments 0 0  
Actuarial loss (gain) 22 71  
Benefits Paid (59) (86)  
Settlements 0 0  
Curtailments 6 (2)  
Special termination benefits 0 0 0
Other 0 0  
Benefit obligation at December 31 769 757 719
Fair value of plan assets      
Fair value of plan assets at January 1 339 289  
Actual return on plan assets 51 38  
Employer contributions 0 0  
Contributions by Plan Participant 7 15  
Foreign currency exchange rate changes 0 0  
Benefits Paid (1) (3)  
Settlements 0 0  
Other 0 0  
Fair value of plan assets at December 31 396 339 $ 289
Net liability recognized (373) (418)  
Pension and other benefit amounts recognized in our consolidated balance sheets      
Noncurrent asset 0 0  
Current liability (19) (21)  
Long-term liability (354) (397)  
Net liability recognized $ (373) (418)  
Domestic Plan      
Defined Benefit Plan Disclosure      
Portion of projected pension benefit obligation represented by the defined benefit plan (as a percent) 61.00%    
Defined Benefit Plan Portion of Projected Pension Plan Assets Percentage 59.00%    
Fair value of plan assets      
Fair value of plan assets at January 1 $ 5,149    
Fair value of plan assets at December 31 $ 5,373 $ 5,149