Allowance and Carrying Value of Outstanding Loans and Leases by Portfolio Segment (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Jun. 30, 2013
Impaired Loans and Troubled Debt Restructurings [Member]
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Dec. 31, 2012
Impaired Loans and Troubled Debt Restructurings [Member]
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Jun. 30, 2013
Collectively Evaluated For Impairment [Member]
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Dec. 31, 2012
Collectively Evaluated For Impairment [Member]
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Jun. 30, 2013
Purchased Credit-Impaired Loans [Member]
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Jun. 30, 2012
Purchased Credit-Impaired Loans [Member]
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Jun. 30, 2013
Purchased Credit-Impaired Loans [Member]
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Jun. 30, 2012
Purchased Credit-Impaired Loans [Member]
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Dec. 31, 2012
Purchased Credit-Impaired Loans [Member]
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Jun. 30, 2013
Home Loans [Member]
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Jun. 30, 2013
Home Loans [Member]
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Mar. 31, 2013
Home Loans [Member]
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Dec. 31, 2012
Home Loans [Member]
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Jun. 30, 2012
Home Loans [Member]
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Mar. 31, 2012
Home Loans [Member]
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Dec. 31, 2011
Home Loans [Member]
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Jun. 30, 2013
Home Loans [Member]
Impaired Loans and Troubled Debt Restructurings [Member]
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Dec. 31, 2012
Home Loans [Member]
Impaired Loans and Troubled Debt Restructurings [Member]
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Jun. 30, 2013
Home Loans [Member]
Collectively Evaluated For Impairment [Member]
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Dec. 31, 2012
Home Loans [Member]
Collectively Evaluated For Impairment [Member]
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Jun. 30, 2013
Home Loans [Member]
Purchased Credit-Impaired Loans [Member]
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Dec. 31, 2012
Home Loans [Member]
Purchased Credit-Impaired Loans [Member]
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Jun. 30, 2013
Credit Card and Other Consumer [Member]
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Jun. 30, 2013
Credit Card and Other Consumer [Member]
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Mar. 31, 2013
Credit Card and Other Consumer [Member]
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Dec. 31, 2012
Credit Card and Other Consumer [Member]
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Jun. 30, 2012
Credit Card and Other Consumer [Member]
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Mar. 31, 2012
Credit Card and Other Consumer [Member]
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Dec. 31, 2011
Credit Card and Other Consumer [Member]
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Jun. 30, 2013
Credit Card and Other Consumer [Member]
Impaired Loans and Troubled Debt Restructurings [Member]
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Dec. 31, 2012
Credit Card and Other Consumer [Member]
Impaired Loans and Troubled Debt Restructurings [Member]
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Jun. 30, 2013
Credit Card and Other Consumer [Member]
Collectively Evaluated For Impairment [Member]
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Dec. 31, 2012
Credit Card and Other Consumer [Member]
Collectively Evaluated For Impairment [Member]
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Jun. 30, 2013
Commercial [Member]
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Jun. 30, 2013
Commercial [Member]
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Mar. 31, 2013
Commercial [Member]
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Dec. 31, 2012
Commercial [Member]
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Jun. 30, 2012
Commercial [Member]
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Mar. 31, 2012
Commercial [Member]
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Dec. 31, 2011
Commercial [Member]
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Jun. 30, 2013
Commercial [Member]
Impaired Loans and Troubled Debt Restructurings [Member]
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Dec. 31, 2012
Commercial [Member]
Impaired Loans and Troubled Debt Restructurings [Member]
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Jun. 30, 2013
Commercial [Member]
Collectively Evaluated For Impairment [Member]
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Dec. 31, 2012
Commercial [Member]
Collectively Evaluated For Impairment [Member]
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Jun. 30, 2013
Small Business Commercial Loan [Member]
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Dec. 31, 2012
Small Business Commercial Loan [Member]
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Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Allowance for Loan and Lease Losses, Loans Acquired | $ (252,000,000) | $ 6,000,000 | $ (459,000,000) | $ 493,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Purchased Credit Impaired Loans, Write Offs | (313,000,000) | (1,152,000,000) | 313,000,000 | 0 | 1,200,000,000 | 0 | (313,000,000) | (1,152,000,000) | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Carrying Value of Outstanding Loans and Leases [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Allowance for Loan and Lease Losses | 21,235,000,000 | 21,235,000,000 | 22,441,000,000 | 24,179,000,000 | 30,288,000,000 | 32,211,000,000 | 33,783,000,000 | 2,808,000,000 | [1],[2] | 3,314,000,000 | [1],[2] | 14,502,000,000 | 15,329,000,000 | 3,925,000,000 | [2] | 3,925,000,000 | [2] | 5,536,000,000 | 12,396,000,000 | 12,396,000,000 | 13,438,000,000 | 14,933,000,000 | 19,964,000,000 | 20,973,000,000 | 21,079,000,000 | 1,719,000,000 | [1],[2] | 1,700,000,000 | [1],[2] | 6,752,000,000 | 7,697,000,000 | 3,925,000,000 | 5,536,000,000 | 5,671,000,000 | 5,671,000,000 | 5,874,000,000 | 6,140,000,000 | 7,024,000,000 | 7,664,000,000 | 8,569,000,000 | 761,000,000 | [1],[2] | 1,139,000,000 | [1],[2] | 4,910,000,000 | 5,001,000,000 | 3,168,000,000 | 3,168,000,000 | 3,129,000,000 | 3,106,000,000 | 3,300,000,000 | 3,574,000,000 | 4,135,000,000 | 328,000,000 | [1],[2] | 475,000,000 | [1],[2] | 2,840,000,000 | 2,631,000,000 | ||||||||||||||||||||||||||||||||||||
Carrying Value Gross of Valuation Allowance | 912,109,000,000 | [3],[4] | 912,109,000,000 | [3],[4] | 898,817,000,000 | [3],[4] | 40,236,000,000 | [2],[3] | 39,077,000,000 | [2],[3] | 843,218,000,000 | [3],[4] | 833,622,000,000 | [3],[4] | 28,655,000,000 | [2] | 28,655,000,000 | [2] | 26,118,000,000 | 353,970,000,000 | [3],[4] | 353,970,000,000 | [3],[4] | 361,069,000,000 | [3],[4] | 33,793,000,000 | [2],[3] | 30,250,000,000 | [2],[3] | 291,522,000,000 | [3],[4] | 304,701,000,000 | [3],[4] | 28,655,000,000 | 26,118,000,000 | 186,024,000,000 | [3],[4] | 186,024,000,000 | [3],[4] | 191,365,000,000 | [3],[4] | 2,821,000,000 | [2],[3] | 3,946,000,000 | [2],[3] | 183,203,000,000 | [3],[4] | 187,419,000,000 | [3],[4] | 372,115,000,000 | [3],[4] | 372,115,000,000 | [3],[4] | 346,383,000,000 | [3],[4] | 3,622,000,000 | [2],[3] | 4,881,000,000 | [2],[3] | 368,493,000,000 | [3],[4] | 341,502,000,000 | [3],[4] | ||||||||||||||||||||||||||||||||
Valuation Allowance As A Percentage Of Carrying Value | 2.33% | [4] | 2.33% | [4] | 2.69% | [4] | 6.98% | [2] | 8.48% | [2] | 1.72% | [4] | 1.84% | [4] | 13.70% | [2] | 13.70% | [2] | 21.20% | 3.50% | [4] | 3.50% | [4] | 4.14% | [4] | 5.09% | [2] | 5.62% | [2] | 2.32% | [4] | 2.53% | [4] | 13.70% | 21.20% | 3.05% | [4] | 3.05% | [4] | 3.21% | [4] | 26.98% | [2] | 28.86% | [2] | 2.68% | [4] | 2.67% | [4] | 0.85% | [4] | 0.85% | [4] | 0.90% | [4] | 9.06% | [2] | 9.73% | [2] | 0.77% | [4] | 0.77% | [4] | ||||||||||||||||||||||||||||||||
Financing Receivable, Modifications, Recorded Investment | 2,821,000,000 | 2,821,000,000 | 3,946,000,000 | 58,000,000 | 97,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Loans Receivable, Fair Value Disclosure | $ 9,461,000,000 | $ 9,461,000,000 | $ 9,002,000,000 | $ 8,409,000,000 | [5] | $ 8,409,000,000 | [5] | $ 7,997,000,000 | [6] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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