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Postretirement Benefit Plans - Schedule of Change in AOCI (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
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 $ 347
Adjustments, net actuarial loss 44
Recognized within net income, net actuarial loss (38)
Tax effect, net actuarial loss 6
Total change to AOCI, net actuarial loss 12
AOCI balance, net actuarial loss portion (net of taxes), period end 359
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 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 (1)
U.S. | Defined benefit plan  
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 91
Adjustments, net actuarial loss 66
Recognized within net income, net actuarial loss (23)
Tax effect, net actuarial loss (9)
Total change to AOCI, net actuarial loss 34
AOCI balance, net actuarial loss portion (net of taxes), period end 125
U.S. | Retiree health care plan  
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 (3)
Adjustments, net actuarial loss (6)
Recognized within net income, net actuarial loss 0
Tax effect, net actuarial loss 1
Total change to AOCI, net actuarial loss (5)
AOCI balance, net actuarial loss portion (net of taxes), period end (8)
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 (4)
Adjustments, prior service credit 0
Recognized within net income, prior service credit 2
Tax effect, prior service credit 0
Total change to AOCI, prior service credit 2
AOCI balance, net prior service credit (net of taxes), period end (2)
Non-U.S. | Defined benefit plan  
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 259
Adjustments, net actuarial loss (16)
Recognized within net income, net actuarial loss (15)
Tax effect, net actuarial loss 14
Total change to AOCI, net actuarial loss (17)
AOCI balance, net actuarial loss portion (net of taxes), period end 242
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 (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 $ 1