Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Expenses [Abstract]
Insurance Commissions	$ 109	$ 104	$ 219	$ 203
Communications and Information Technology	74	71	145	140
Lease And Loan Administration	40	39	82	75
Marketing and Advertising Expense	29	33	68	63
Professional Fees	35	27	67	53
Federal Deposit Insurance Corporation Premium Expense	35	28	65	55
Vehicle remarketing and repossession	26	25	58	53
Depreciation, Nonproduction	22	23	42	45
Occupancy, Net	11	11	22	23
Taxes, Miscellaneous	6	8	14	16
Amortization of Intangible Assets	3	3	6	6
Other Cost and Expense, Operating	56	48	103	93
Other Noninterest Expense	$ 446	$ 420	$ 891	$ 825