Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Nonoperating Income (Expense) [Abstract]
Late charges and other administrative fees	$ 28	$ 29	$ 85	$ 83
Remarketing fees	19	19	56	63
Income from equity-method investments	7	5	19	18
Servicing fees	4	5	14	21
Other income, net	38	43	102	122
Total other income, net of losses	$ 96	$ 101	$ 276	$ 307