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Employee Benefit Obligations - AOCI, Obligations exceeding assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Amounts recognized in accumulated other comprehensive (earnings) loss    
Decrease in net actuarial losses from prior period $ 361  
Unfunded Plan    
Benefit plans with an accumulated benefit obligation in excess of plan assets    
Fair value of plan assets 0 $ 0
Defined Benefit Pension Plans    
Amounts recognized in accumulated other comprehensive (earnings) loss    
Net actuarial (loss) gain (207) (568)
Net prior service (cost) credit (36) (39)
Tax effect and currency exchange rates 74 141
Accumulated other comprehensive (earnings) loss (169) (466)
Benefit plans with an accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 2,615 3,108
Accumulated benefit obligation 2,478 2,996
Fair value of plan assets 2,033 2,153
Defined Benefit Pension Plans | United States    
Amounts recognized in accumulated other comprehensive (earnings) loss    
Net actuarial (loss) gain (290) (625)
Net prior service (cost) credit 15 15
Tax effect and currency exchange rates 80 162
Accumulated other comprehensive (earnings) loss (195) (448)
Benefit plans with an accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 2,304 2,752
Accumulated benefit obligation 2,171 2,643
Fair value of plan assets 1,960 2,085
Defined Benefit Pension Plans | Non U.S.    
Amounts recognized in accumulated other comprehensive (earnings) loss    
Net actuarial (loss) gain 83 57
Net prior service (cost) credit (51) (54)
Tax effect and currency exchange rates (6) (21)
Accumulated other comprehensive (earnings) loss 26 (18)
Benefit plans with an accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 311 356
Accumulated benefit obligation 307 353
Fair value of plan assets $ 73 $ 68