Loans and Allowance for Loan Losses (Details 7) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Consumer portfolio loans
Nonaccrual		$ 362	$ 375
Loans held for investment	[1]	76,399	76,804
Total loans held for investment, before purchased credit-impaired loans		75,956	76,279
Consumer
Consumer portfolio loans
Loans and Leases Receivable, Net Amount		23	28
Accrual		31,398	32,019
Nonaccrual		245	271
Total loans held for investment, before purchased credit-impaired loans		31,643	32,290
Consumer portfolio
Consumer portfolio loans
Accrual		31,227	31,823
Nonaccrual		245	271
Loans held for investment		31,472	32,094
Total loans held for investment, before purchased credit-impaired loans		31,472	32,094
Consumer portfolio | Residential mortgage
Consumer portfolio loans
Accrual		28,165	28,746
Nonaccrual		209	231
Total loans held for investment, before purchased credit-impaired loans		28,374	28,977
Consumer portfolio | Home equity and other consumer loans
Consumer portfolio loans
Accrual		3,062	3,077
Nonaccrual		36	40
Total loans held for investment, before purchased credit-impaired loans		3,098	3,117
Purchased credit-impaired loans
Consumer portfolio loans
Nonaccrual		10	9
Loans held for investment		443	525
Purchased credit-impaired loans | Consumer
Consumer portfolio loans
Accrual		171	196
Nonaccrual		0	0
Total loans held for investment, before purchased credit-impaired loans		$ 171	$ 196

[1] Includes $157 million and $151 million at June 30, 2015 and December 31, 2014, respectively, for net unamortized discounts and premiums and deferred fees and costs.