Loans and Allowance for Loan Losses (Details 7) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Consumer portfolio loans
Nonaccrual		$ 419	$ 375
Loans held for investment	[1]	76,641	76,804
Total loans held for investment, before purchased credit-impaired loans		76,253	76,279
Consumer
Consumer portfolio loans
Loans and Leases Receivable, Net Amount		21	28
Accrual		30,905	32,019
Nonaccrual		233	271
Total loans held for investment, before purchased credit-impaired loans		31,138	32,290
Consumer portfolio
Consumer portfolio loans
Accrual		30,747	31,823
Nonaccrual		233	271
Loans held for investment		30,980	32,094
Total loans held for investment, before purchased credit-impaired loans		30,980	32,094
Consumer portfolio | Residential mortgage
Consumer portfolio loans
Accrual		27,655	28,746
Nonaccrual		201	231
Total loans held for investment, before purchased credit-impaired loans		27,856	28,977
Consumer portfolio | Home equity and other consumer loans
Consumer portfolio loans
Accrual		3,092	3,077
Nonaccrual		32	40
Total loans held for investment, before purchased credit-impaired loans		3,124	3,117
Purchased credit-impaired loans
Consumer portfolio loans
Nonaccrual		8	9
Loans held for investment		388	525
Purchased credit-impaired loans | Consumer
Consumer portfolio loans
Accrual		158	196
Nonaccrual		0	0
Total loans held for investment, before purchased credit-impaired loans		$ 158	$ 196

[1] Includes $152 million and $151 million at September 30, 2015 and December 31, 2014, respectively, for net unamortized discounts and premiums and deferred fees and costs.