Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Nonoperating Income (Expense) [Abstract]
Late charges and other administrative fees	$ 110	$ 102	$ 98
Remarketing fees	79	104	103
Income from equity method investments	46	14	18
Servicing fees	27	51	64
Other income, net	155	130	106
Total other income, net of losses	$ 417	$ 401	$ 389