Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Expenses [Abstract]
Insurance commissions	$ 136	$ 126
Technology and communications	78	79
Lease and loan administration	55	38
Advertising and marketing	41	44
Property and equipment depreciation	36	34
Professional services	33	31
Vehicle remarketing and repossession	21	23
Regulatory and licensing fees	18	29
Occupancy	15	16
Non-income taxes	6	7
Amortization of intangible assets	5	5
Other	41	54
Total other operating expenses	$ 485	$ 486