Postretirement Benefit Plans - Amounts Recognized on our Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	$ 218	$ 92
Accrued expenses and other liabilities & other long-term liabilities	(21)	(11)
Underfunded retirement plans	(93)	(118)
Funded status at end of year	104	(37)
U.S. | Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	73	40
Accrued expenses and other liabilities & other long-term liabilities	(17)	(8)
Underfunded retirement plans	(29)	(37)
Funded status at end of year	27	(5)
U.S. | Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	0	0
Accrued expenses and other liabilities & other long-term liabilities	0	0
Underfunded retirement plans	(3)	(31)
Funded status at end of year	(3)	(31)
Non-U.S. | Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	145	52
Accrued expenses and other liabilities & other long-term liabilities	(4)	(3)
Underfunded retirement plans	(61)	(50)
Funded status at end of year	$ 80	$ (1)