Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,185	$ 1,186
Foreign currency translation	(18)	(4)
Balance at end of period	1,167	1,182
North America Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period	1,105	1,105
Foreign currency translation	0	0
Balance at end of period	1,105	1,105
International Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period	80	81
Foreign currency translation	(18)	(4)
Balance at end of period	$ 62	$ 77