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Commitments and Contingencies - Additional Information (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 0 Months Ended | ||||||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Sep. 30, 2012
522110 Commercial Banking [Member]
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Dec. 31, 2011
522110 Commercial Banking [Member]
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Sep. 30, 2012
S P Es [Member]
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Dec. 31, 2011
S P Es [Member]
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Sep. 30, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Dec. 31, 2011
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Sep. 30, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
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Sep. 30, 2012
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Dec. 31, 2011
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Sep. 30, 2012
Payment Guarantee [Member]
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Dec. 31, 2011
Payment Guarantee [Member]
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Sep. 30, 2012
Definitive Settlement Agreement [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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| Guarantor Obligations [Line Items] | ||||||||||||||||||
| Unfunded equity investment commitments | $ 315,000,000 | $ 315,000,000 | $ 772,000,000 | |||||||||||||||
| Commitment to purchase residential mortgage and commercial real estate loans | 1,700,000,000 | 1,700,000,000 | 2,500,000,000 | |||||||||||||||
| Forward Dated Resale and Securities Borrowing Agreements Commitment | 98,900,000,000 | 98,900,000,000 | 67,000,000,000 | |||||||||||||||
| Forward Dated Repurchase And Securities Lending Agreements Commitment | 56,400,000,000 | 56,400,000,000 | 42,000,000,000 | |||||||||||||||
| Operating Leases, Future Minimum Payments Due [Abstract] | ||||||||||||||||||
| 2012 | 790,000,000 | 790,000,000 | ||||||||||||||||
| 2013 | 2,900,000,000 | 2,900,000,000 | ||||||||||||||||
| 2014 | 2,300,000,000 | 2,300,000,000 | ||||||||||||||||
| 2015 | 1,900,000,000 | 1,900,000,000 | ||||||||||||||||
| 2016 | 1,600,000,000 | 1,600,000,000 | ||||||||||||||||
| Thereafter | 7,200,000,000 | 7,200,000,000 | ||||||||||||||||
| Committed Minimum Fees On Market Data Communications Systems Consulting And Other Office Related Services | 1,600,000,000 | 1,600,000,000 | 1,900,000,000 | |||||||||||||||
| Notional Amount of Derivatives | 1,672,446,000,000 | 1,672,446,000,000 | 1,903,782,000,000 | 3,100,000,000 | 3,200,000,000 | 1,500,000,000 | 1,800,000,000 | 15,900,000,000 | 15,800,000,000 | 3,400,000,000 | 20,200,000,000 | 28,800,000,000 | ||||||
| Life Insurance Book Value Protection, Fair Value Liability | 35,000,000 | 35,000,000 | 48,000,000 | |||||||||||||||
| Merchant Services Transactions Processed And Settled By Sponsored Entitites | 153,900,000,000 | 128,200,000,000 | 442,700,000,000 | 323,100,000,000 | ||||||||||||||
| Losses As Result Of Cardholder Disputed Transactions | 3,000,000 | 2,000,000 | 7,000,000 | 8,000,000 | ||||||||||||||
| Equity Method Investment, Ownership Percentage | 49.00% | 49.00% | ||||||||||||||||
| Merchant escrow deposits held as collateral | 210,000,000 | 210,000,000 | 238,000,000 | |||||||||||||||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 256,400,000,000 | 256,400,000,000 | 236,000,000,000 | |||||||||||||||
| Registration Payment Arrangement, Maximum Potential Consideration | 3,200,000,000 | 3,700,000,000 | ||||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 410,000,000 | 410,000,000 | 476,000,000 | |||||||||||||||
| Payment Protection Insurance Claims Expense | 267,000,000 | 467,000,000 | 77,000,000 | |||||||||||||||
| Litigation Settlement, Expense | 1,600,000,000 | 566,000,000 | 3,300,000,000 | 3,800,000,000 | 2,400,000,000 | |||||||||||||
| Litigation Settlement Distribution of Amount Equal to Interchange Rate Basis Points | 0.00% | |||||||||||||||||
| Loss Contingency, Range of Possible Loss, Minimum | 0 | 0 | ||||||||||||||||
| Loss Contingency, Range of Possible Loss, Maximum | $ 2,800,000,000 | $ 2,800,000,000 | ||||||||||||||||