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

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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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Loans and Allowance for Credit Losses, Loans by Credit Impairment Methodology (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2008
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated	$ 10,569		$ 11,475
Allowance for Credit Losses, Individually evaluated	5,978		5,885
Allowance for Credit Losses, Purchased Credit-Impaired	71		117	212
Total allowance for credit losses	16,618	17,193	17,477	18,646	19,129	19,668
Financing Receivable, Collectively evaluated	743,496		738,594
Financing Receivable, Individually evaluated	29,679		30,012
Purchased Credit Impaired Loans	28,799		30,968				58,797
Loans	801,974		799,574
Commercial Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated	4,360		3,951
Allowance for Credit Losses, Individually evaluated	1,487		1,675
Allowance for Credit Losses, Purchased Credit-Impaired	49		88
Total allowance for credit losses	5,896	5,786	5,714	6,159	6,130	6,358
Financing Receivable, Collectively evaluated	353,554		349,035
Financing Receivable, Individually evaluated	6,661		8,186
Purchased Credit Impaired Loans	3,257		3,977				18,704
Loans	363,472		361,198
Consumer Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated	6,209		7,524
Allowance for Credit Losses, Individually evaluated	4,491		4,210
Allowance for Credit Losses, Purchased Credit-Impaired	22		29
Total allowance for credit losses	10,722	11,407	11,763	12,487	12,999	13,310
Financing Receivable, Collectively evaluated	389,942		389,559
Financing Receivable, Individually evaluated	23,018		21,826
Purchased Credit Impaired Loans	25,542		26,991				40,093
Loans	$ 438,502		$ 438,376