Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Expenses [Abstract]
Insurance commissions	$ 517	$ 475	$ 440
Technology and communications	314	311	299
Lease and loan administration	203	172	164
Advertising and marketing	171	180	172
Property and equipment depreciation	136	96	87
Professional services	118	126	133
Regulatory and licensing fees	96	115	121
Vehicle remarketing and repossession	73	105	111
Occupancy	57	57	45
Non-income taxes	28	34	29
Amortization of intangible assets	18	13	11
Other	313	202	202
Total other operating expenses	$ 2,044	$ 1,886	$ 1,814