Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Expenses [Abstract]
Insurance commissions	$ 127	$ 117	$ 253	$ 231
Technology and communications	80	73	159	150
Lease and loan administration	46	43	84	82
Advertising and marketing	32	35	76	83
Property and equipment depreciation	34	25	68	47
Professional services	28	30	59	59
Regulatory and licensing fees	29	28	58	56
Vehicle remarketing and repossession	11	25	34	52
Occupancy	13	16	29	29
Non-income taxes	7	11	14	20
Amortization of intangible assets	5	3	10	6
Other	47	52	101	96
Total other operating expenses	$ 459	$ 458	$ 945	$ 911