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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

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