Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Expenses [Abstract]
Insurance commissions	$ 120	$ 113	$ 351	$ 332
Technology and communications	77	75	227	220
Advertising and marketing	46	38	129	106
Lease and loan administration	40	42	122	124
Professional services	32	33	91	100
Regulatory and licensing fees	29	33	85	98
Vehicle remarketing and repossession	26	27	78	85
Premises and equipment depreciation	25	22	72	64
Occupancy	14	11	43	33
Non-income taxes	9	10	29	24
Amortization of intangible assets	2	2	8	8
Other operating expenses	48	50	144	153
Total other operating expenses	$ 468	$ 456	$ 1,379	$ 1,347