Loans and Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2008
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
Purchased Credit Impaired Loans (carrying value)	$ 27,834	$ 30,968	$ 58,797
Loans	812,325	799,574
Residential Mortgage [Member]
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
Purchased Credit Impaired Loans (carrying value)	24,857	26,991
Loans	322,599	325,365
Residential Mortgage [Member] \| Loans Excluding Purchased Credit-Impaired Loans [Member]
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
0-60%	83,639	68,417
60.01-80%	90,177	84,927
80.01-100%	49,792	52,868
100.01-120%	23,611	30,580
Greater than 120%	17,790	28,139
No LTV/CLTV Available	3,177	3,724
Government insured/guaranteed loans	29,556	29,719
Loans, excluding Purchased Credit Impaired Loans	297,742	298,374
Real estate 1-4 family first mortgage [Member]
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
Purchased Credit Impaired Loans (carrying value)	24,730	26,839	39,214
Loans	254,924	249,900
Real estate 1-4 family first mortgage [Member] \| Loans Excluding Purchased Credit-Impaired Loans [Member]
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
0-60%	70,848	56,247
60.01-80%	74,080	69,759
80.01-100%	33,386	34,830
100.01-120%	12,551	17,004
Greater than 120%	8,066	13,529
No LTV/CLTV Available	1,707	1,973
Government insured/guaranteed loans	29,556	29,719
Loans, excluding Purchased Credit Impaired Loans	230,194	223,061
Real estate 1-4 family junior lien mortgage [Member]
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
Purchased Credit Impaired Loans (carrying value)	127	152	728
Loans	67,675	75,465
Real estate 1-4 family junior lien mortgage [Member] \| Loans Excluding Purchased Credit-Impaired Loans [Member]
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]
0-60%	12,791	12,170
60.01-80%	16,097	15,168
80.01-100%	16,406	18,038
100.01-120%	11,060	13,576
Greater than 120%	9,724	14,610
No LTV/CLTV Available	1,470	1,751
Government insured/guaranteed loans	0	0
Loans, excluding Purchased Credit Impaired Loans	$ 67,548	$ 75,313

The balance of financing receivables that were acquired with deteriorated credit quality.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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