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Commitments and Contingencies - Additional Information (Details)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 0 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
USD ($)
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Jun. 30, 2012
USD ($)
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Jun. 30, 2013
USD ($)
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Jun. 30, 2012
USD ($)
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Dec. 31, 2012
USD ($)
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Jun. 30, 2013
AIG Litigation [Member]
USD ($)
offering
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Jun. 30, 2013
522110 Commercial Banking [Member]
USD ($)
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Dec. 31, 2012
522110 Commercial Banking [Member]
USD ($)
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Jun. 30, 2013
S P Es [Member]
USD ($)
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Dec. 31, 2012
S P Es [Member]
USD ($)
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Jun. 30, 2013
Prudential Litigation [Member]
claim
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Jun. 30, 2013
LIBOR Litigation [Member]
USD ($)
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Jun. 30, 2013
LIBOR Litigation [Member]
SGD
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Jun. 30, 2013
LIBOR Litigation - defendants requiring statutory reserve [Member]
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Jun. 30, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
USD ($)
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Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
USD ($)
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Jun. 30, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
USD ($)
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Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
USD ($)
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Jun. 30, 2013
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
USD ($)
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Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
USD ($)
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Jun. 30, 2013
Payment Guarantee [Member]
USD ($)
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Dec. 31, 2012
Payment Guarantee [Member]
USD ($)
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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 | $ 234,000,000 | $ 234,000,000 | $ 307,000,000 | ||||||||||||||||||||
| Commitment to purchase residential mortgage and commercial real estate loans | 2,000,000,000 | 2,000,000,000 | 1,300,000,000 | ||||||||||||||||||||
| Forward Dated Resale and Securities Borrowing Agreements Commitment | 94,100,000,000 | 94,100,000,000 | 67,300,000,000 | ||||||||||||||||||||
| Forward Dated Repurchase And Securities Lending Agreements Commitment | 58,900,000,000 | 58,900,000,000 | 42,300,000,000 | ||||||||||||||||||||
| Operating Leases, Future Minimum Payments Due [Abstract] | |||||||||||||||||||||||
| 2013 | 1,500,000,000 | 1,500,000,000 | |||||||||||||||||||||
| 2014 | 2,700,000,000 | 2,700,000,000 | |||||||||||||||||||||
| 2015 | 2,300,000,000 | 2,300,000,000 | |||||||||||||||||||||
| 2016 | 2,000,000,000 | 2,000,000,000 | |||||||||||||||||||||
| 2017 | 1,600,000,000 | 1,600,000,000 | |||||||||||||||||||||
| Thereafter | 6,900,000,000 | 6,900,000,000 | |||||||||||||||||||||
| Notional Amount of Derivatives | 1,560,455,000,000 | 1,560,455,000,000 | 1,600,315,000,000 | 2,400,000,000 | 2,900,000,000 | 1,400,000,000 | 1,400,000,000 | 13,300,000,000 | 13,400,000,000 | 3,000,000,000 | 3,000,000,000 | 10,200,000,000 | 18,400,000,000 | ||||||||||
| Life Insurance Book Value Protection, Fair Value Liability | 45,000,000 | 45,000,000 | 52,000,000 | ||||||||||||||||||||
| Merchant Services Transactions Processed And Settled By Sponsored Entitites | 157,900,000,000 | 155,600,000,000 | 306,200,000,000 | 288,800,000,000 | |||||||||||||||||||
| Losses As Result Of Cardholder Disputed Transactions | 4,000,000 | 2,000,000 | 8,000,000 | 4,000,000 | |||||||||||||||||||
| Noncontrolling Interest, Ownership Percentage by Parent | 49.00% | 49.00% | |||||||||||||||||||||
| Merchant escrow deposits held as collateral | 216,000,000 | 216,000,000 | 202,000,000 | ||||||||||||||||||||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 256,000,000,000 | 256,000,000,000 | 263,900,000,000 | ||||||||||||||||||||
| Registration Payment Arrangement, Maximum Potential Consideration | 3,600,000,000 | 3,100,000,000 | |||||||||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 312,000,000 | 312,000,000 | 510,000,000 | ||||||||||||||||||||
| Payment Protection Insurance Claims Expense | 29,000,000 | 0 | 29,000,000 | 200,000,000 | |||||||||||||||||||
| Litigation Settlement, Expense | 471,000,000 | 963,000,000 | 2,700,000,000 | 1,800,000,000 | |||||||||||||||||||
| 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 | |||||||||||||||||||||
| Loss Contingency, Number of Defendants | 20 | 20 | 19 | ||||||||||||||||||||
| Increased statutory reserve with the MAS - percent interest | 0.00% | 0.00% | |||||||||||||||||||||
| Increased statutory reserve with the MAS - Term Length | 1 year | 1 year | |||||||||||||||||||||
| Increased statutory reserve with MAS | 700,000,000 | ||||||||||||||||||||||
| Increased statutory reserve with MAS - United States Dollars | 551,000,000 | ||||||||||||||||||||||
| Increased statutory reserve with the MAS - conversion rate | 0 | ||||||||||||||||||||||
| loss contingency, number of offerings sought to rescind | 322 | 54 | |||||||||||||||||||||
| Loss Contingency, Damages Sought, Value | $ 9,000,000,000 | ||||||||||||||||||||||