Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Expenses [Abstract]
Insurance commissions	$ 475	$ 440	$ 415
Technology and communications	311	299	284
Advertising and marketing	180	172	133
Lease and loan administration	172	164	159
Professional services	126	133	113
Regulatory and licensing fees	115	121	113
Vehicle remarketing and repossession	105	111	110
Premises and equipment depreciation	96	87	89
Occupancy	57	45	46
Non-income taxes	34	29	21
Amortization of intangible assets	13	11	11
Other operating expenses	202	202	189
Total other operating expenses	$ 1,886	$ 1,814	$ 1,683