Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Nonoperating Income (Expense) [Abstract]
Late charges and other administrative fees	$ 28	$ 25	$ 57	$ 54
Remarketing fees	19	21	37	44
Income from equity-method investments	8	7	12	13
Servicing fees	4	8	10	16
Other income, net	34	36	64	79
Total other income, net of losses	$ 93	$ 97	$ 180	$ 206