Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ (292)	$ (300)	$ (200)
Change during period	74	7	(101)
Reclassified into operations	0	1	1
Balance at the end of the period	(218)	(292)	(300)
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	(256)	(282)	(183)
Change during period	85	26	(99)
Reclassified into operations	0	0	0
Balance at the end of the period	(171)	(256)	(282)
Derivative Financial Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	(11)	0	0
Change during period	(6)	(11)	0
Reclassified into operations	0	0	0
Balance at the end of the period	(17)	(11)	0
Other comprehensive income (loss), tax benefit (expense)	0	4	0
Unrecognized pension benefit costs, net of taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	(25)	(18)	(17)
Change during period	(5)	(8)	(2)
Reclassified into operations	0	1	1
Balance at the end of the period	(30)	(25)	(18)
Other comprehensive income (loss), tax benefit (expense)	$ 0	$ 1	$ 1