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Postretirement Benefit Plans - Amounts Recognized on our Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Overfunded retirement plans $ 246 $ 218
Accrued expenses and other liabilities & other long-term liabilities (11) (21)
Underfunded retirement plans (131) (93)
Funded status at end of year 104 104
U.S. | Defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Overfunded retirement plans 9 73
Accrued expenses and other liabilities & other long-term liabilities (6) (17)
Underfunded retirement plans (39) (29)
Funded status at end of year (36) 27
U.S. | Retiree health care plan    
Defined Benefit Plan Disclosure [Line Items]    
Overfunded retirement plans 3 0
Accrued expenses and other liabilities & other long-term liabilities 0 0
Underfunded retirement plans (3) (3)
Funded status at end of year 0 (3)
Non-U.S. | Defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Overfunded retirement plans 234 145
Accrued expenses and other liabilities & other long-term liabilities (5) (4)
Underfunded retirement plans (89) (61)
Funded status at end of year $ 140 $ 80