Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Expenses [Abstract]
Insurance commissions	$ 130	$ 120	$ 383	$ 351
Technology and communications	77	77	236	227
Lease and loan administration	57	40	141	122
Advertising and marketing	36	46	112	129
Property and equipment depreciation	34	25	102	72
Professional services	28	32	87	91
Regulatory and licensing fees	18	29	76	85
Vehicle remarketing and repossession	17	26	51	78
Occupancy	14	14	43	43
Non-income taxes	9	9	23	29
Amortization of intangible assets	4	2	14	8
Other	54	48	155	144
Total other operating expenses	$ 478	$ 468	$ 1,423	$ 1,379