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Postretirement Benefit Plans - Schedule of Change in AOCI (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Defined benefit plan amounts recognized in other comprehensive income net actuarial loss portion roll forward  
AOCI balance, net actuarial loss portion (net of taxes), beginning of period $ 359
Adjustments, net actuarial loss (231)
Recognized within net income, net actuarial loss (37)
Tax effect, net actuarial loss 64
Total change to AOCI, net actuarial loss (204)
AOCI balance, net actuarial loss portion (net of taxes), period end 155
Defined benefit plan amounts recognized in other comprehensive income prior service credit portion roll forward  
AOCI balance, net prior service credit (net of taxes), beginning of period (1)
Adjustments, prior service credit 0
Recognized within net income, prior service credit 1
Tax effect, prior service credit 0
Total change to AOCI, prior service credit 1
AOCI balance, net prior service credit (net of taxes), period end 0
U.S. | Defined Benefit  
Defined benefit plan amounts recognized in other comprehensive income net actuarial loss portion roll forward  
AOCI balance, net actuarial loss portion (net of taxes), beginning of period 125
Adjustments, net actuarial loss (84)
Recognized within net income, net actuarial loss (28)
Tax effect, net actuarial loss 23
Total change to AOCI, net actuarial loss (89)
AOCI balance, net actuarial loss portion (net of taxes), period end 36
U.S. | Retiree Health Care  
Defined benefit plan amounts recognized in other comprehensive income net actuarial loss portion roll forward  
AOCI balance, net actuarial loss portion (net of taxes), beginning of period (8)
Adjustments, net actuarial loss (28)
Recognized within net income, net actuarial loss 0
Tax effect, net actuarial loss 6
Total change to AOCI, net actuarial loss (22)
AOCI balance, net actuarial loss portion (net of taxes), period end (30)
Defined benefit plan amounts recognized in other comprehensive income prior service credit portion roll forward  
AOCI balance, net prior service credit (net of taxes), beginning of period (2)
Adjustments, prior service credit 0
Recognized within net income, prior service credit 2
Tax effect, prior service credit (1)
Total change to AOCI, prior service credit 1
AOCI balance, net prior service credit (net of taxes), period end (1)
Non-U.S. | Defined Benefit  
Defined benefit plan amounts recognized in other comprehensive income net actuarial loss portion roll forward  
AOCI balance, net actuarial loss portion (net of taxes), beginning of period 242
Adjustments, net actuarial loss (119)
Recognized within net income, net actuarial loss (9)
Tax effect, net actuarial loss 35
Total change to AOCI, net actuarial loss (93)
AOCI balance, net actuarial loss portion (net of taxes), period end 149
Defined benefit plan amounts recognized in other comprehensive income prior service credit portion roll forward  
AOCI balance, net prior service credit (net of taxes), beginning of period 1
Adjustments, prior service credit 0
Recognized within net income, prior service credit (1)
Tax effect, prior service credit 1
Total change to AOCI, prior service credit 0
AOCI balance, net prior service credit (net of taxes), period end $ 1