Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Expenses [Abstract]
Insurance commissions	$ 440	$ 415	$ 389
Technology and communications	299	284	274
Advertising and marketing	172	133	112
Lease and loan administration	164	159	136
Professional services	133	113	103
Regulatory and licensing fees	121	113	94
Vehicle remarketing and repossession	111	110	95
Premises and equipment depreciation	87	89	84
Occupancy	45	46	51
Non-income taxes	29	21	25
Amortization of intangible assets	11	11	6
Other operating expenses	202	189	236
Total other operating expenses	$ 1,814	$ 1,683	$ 1,605