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Commitments and Contingencies - Additional Information (Details) (USD $)
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3 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | ||||||||||||
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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Mar. 31, 2013
522110 Commercial Banking [Member]
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Dec. 31, 2012
522110 Commercial Banking [Member]
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Mar. 31, 2013
S P Es [Member]
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Mar. 31, 2013
Luther Litigation [Member]
offering
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Mar. 31, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Mar. 31, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
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Mar. 31, 2013
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Mar. 31, 2013
Payment Guarantee [Member]
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Dec. 31, 2012
Payment Guarantee [Member]
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Jul. 13, 2012
MasterCard and Visa [Member]
Definitive Settlement Agreement, Class Plaintiffs [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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Mar. 31, 2013
Luther Litigation [Member]
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| Guarantor Obligations [Line Items] | ||||||||||||||||
| Unfunded equity investment commitments | $ 275,000,000 | $ 307,000,000 | ||||||||||||||
| Commitment to purchase residential mortgage and commercial real estate loans | 1,700,000,000 | 1,300,000,000 | ||||||||||||||
| Forward Dated Resale and Securities Borrowing Agreements Commitment | 86,900,000,000 | 67,300,000,000 | ||||||||||||||
| Forward Dated Repurchase And Securities Lending Agreements Commitment | 56,900,000,000 | 42,300,000,000 | ||||||||||||||
| Operating Leases, Future Minimum Payments Due [Abstract] | ||||||||||||||||
| 2013 | 2,277,000,000 | |||||||||||||||
| 2014 | 2,600,000,000 | |||||||||||||||
| 2015 | 2,300,000,000 | |||||||||||||||
| 2016 | 1,900,000,000 | |||||||||||||||
| 2017 | 1,500,000,000 | |||||||||||||||
| Thereafter | 6,700,000,000 | |||||||||||||||
| Notional Amount of Derivatives | 1,655,235,000,000 | 1,600,315,000,000 | 2,600,000,000 | 2,900,000,000 | 1,400,000,000 | 13,200,000,000 | 13,400,000,000 | 3,000,000,000 | 15,700,000,000 | 18,400,000,000 | ||||||
| Life Insurance Book Value Protection, Fair Value Liability | 49,000,000 | 52,000,000 | ||||||||||||||
| Merchant Services Transactions Processed And Settled By Sponsored Entitites | 148,300,000,000 | 133,200,000,000 | ||||||||||||||
| Losses As Result Of Cardholder Disputed Transactions | 4,000,000 | 2,000,000 | ||||||||||||||
| Merchant escrow deposits held as collateral | 226,000,000 | 202,000,000 | ||||||||||||||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 259,100,000,000 | 263,900,000,000 | ||||||||||||||
| Registration Payment Arrangement, Maximum Potential Consideration | 3,300,000,000 | 3,100,000,000 | ||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 391,000,000 | 510,000,000 | ||||||||||||||
| Payment Protection Insurance Claims Expense | 0 | 200,000,000 | ||||||||||||||
| Loss Contingency, Loss in Period | 500,000,000 | |||||||||||||||
| Litigation Settlement, Expense | 2,200,000,000 | 793,000,000 | ||||||||||||||
| Litigation Settlement Distribution of Amount Equal to Interchange Rate Basis Points | 0.00% | |||||||||||||||
| Loss Contingency, Range of Possible Loss, Minimum | 0 | |||||||||||||||
| Loss Contingency, Range of Possible Loss, Maximum | $ 2,600,000,000 | |||||||||||||||
| Loss Contingency, Cases Filed Against Other Financial Institutions, Number | 429 | |||||||||||||||