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Commitments and Contingencies - Additional Information (Details) (USD $)
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3 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 48 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | |||||||||||||||||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Mar. 31, 2014
US Government and Government Agencies and Authorities [Member]
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Dec. 31, 2013
Credit Card Cancellation and Identity Theft Consumers [Member]
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Mar. 25, 2014
New York Attorney General (NYAG) [Member]
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Mar. 31, 2014
522110 Commercial Banking [Member]
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Dec. 31, 2013
522110 Commercial Banking [Member]
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Mar. 31, 2014
S P Es [Member]
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Dec. 31, 2013
S P Es [Member]
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Mar. 31, 2014
FGIC Settlement [Member]
trust
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Mar. 31, 2014
Federal Housing Finance Agency (FHFA) [Member]
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Dec. 31, 2008
Federal Housing Finance Agency (FHFA) [Member]
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Mar. 31, 2014
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Dec. 31, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Mar. 31, 2014
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
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Dec. 31, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
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Mar. 31, 2014
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Dec. 31, 2013
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Mar. 31, 2014
Payment Guarantee [Member]
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Dec. 31, 2013
Payment Guarantee [Member]
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Mar. 31, 2014
FGIC Settlement [Member]
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Mar. 31, 2014
Residential Mortgage Backed Securities [Member]
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Apr. 07, 2014
FGIC Settlement [Member]
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Mar. 31, 2014
FGIC Settlement [Member]
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Apr. 07, 2014
Subsequent Event [Member]
FGIC Settlement [Member]
Second Mortgage [Member]
trust
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| Guarantor Obligations [Line Items] | ||||||||||||||||||||||||||
| Unfunded equity investment commitments | $ 133,000,000 | $ 195,000,000 | ||||||||||||||||||||||||
| Commitment to purchase equity securities | 1,400,000,000 | 1,400,000,000 | ||||||||||||||||||||||||
| Commitment to purchase residential mortgage and commercial real estate loans | 2,800,000,000 | 1,500,000,000 | ||||||||||||||||||||||||
| Purchase Commitment, Remaining Minimum Amount Committed | 3,200,000,000 | |||||||||||||||||||||||||
| Forward Dated Resale and Securities Borrowing Agreements Commitment | 93,500,000,000 | 75,500,000,000 | ||||||||||||||||||||||||
| Forward Dated Repurchase And Securities Lending Agreements Commitment | 56,500,000,000 | 38,300,000,000 | ||||||||||||||||||||||||
| Operating Leases, Future Minimum Payments Due [Abstract] | ||||||||||||||||||||||||||
| 2014 | 2,200,000,000 | |||||||||||||||||||||||||
| 2015 | 2,500,000,000 | |||||||||||||||||||||||||
| 2016 | 2,200,000,000 | |||||||||||||||||||||||||
| 2017 | 1,700,000,000 | |||||||||||||||||||||||||
| 2018 | 1,300,000,000 | |||||||||||||||||||||||||
| Thereafter | 5,700,000,000 | |||||||||||||||||||||||||
| Notional Amount of Derivatives | 1,348,481,000,000 | 1,328,787,000,000 | 1,700,000,000 | 1,800,000,000 | 1,300,000,000 | 1,300,000,000 | 13,400,000,000 | 13,400,000,000 | 3,100,000,000 | 3,000,000,000 | 3,300,000,000 | 4,600,000,000 | ||||||||||||||
| Life Insurance Book Value Protection, Fair Value Liability | 35,000,000 | 39,000,000 | ||||||||||||||||||||||||
| Merchant Services Transactions Processed And Settled By Sponsored Entitites | 149,400,000,000 | 148,300,000,000 | ||||||||||||||||||||||||
| Losses As Result Of Cardholder Disputed Transactions | (4,000,000) | (4,000,000) | ||||||||||||||||||||||||
| Noncontrolling Interest, Ownership Percentage by Parent | 49.00% | |||||||||||||||||||||||||
| Merchant escrow deposits held as collateral | 114,000,000 | 203,000,000 | ||||||||||||||||||||||||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 251,700,000,000 | 258,500,000,000 | ||||||||||||||||||||||||
| Registration Payment Arrangement, Maximum Potential Consideration | 6,800,000,000 | 6,900,000,000 | ||||||||||||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 413,000,000 | 381,000,000 | ||||||||||||||||||||||||
| Payment Protection Insurance Claims Expense | 141,000,000 | 0 | ||||||||||||||||||||||||
| Litigation Settlement, Expense | 6,000,000,000 | 2,200,000,000 | 3,600,000,000 | |||||||||||||||||||||||
| Loss Contingency, Loss in Period | 103,000,000 | |||||||||||||||||||||||||
| Loss Contingency, Range of Possible Loss, Minimum | 0 | |||||||||||||||||||||||||
| Loss Contingency, Range of Possible Loss, Maximum | 5,000,000,000 | |||||||||||||||||||||||||
| Number Of Trusts Involved In Settlement Agreement | 7 | |||||||||||||||||||||||||
| Loss Contingency, Pending Claims, Number | 2 | |||||||||||||||||||||||||
| Payments for Legal Settlements | 45,000,000 | 738,000,000 | 900,000,000 | 900,000,000 | ||||||||||||||||||||||
| Litigation Settlement, Amount | 15,000,000 | |||||||||||||||||||||||||
| Additional litigation payment subject to settlement completion [Line Items] | 50,000,000 | 50,000,000 | ||||||||||||||||||||||||
| Litigation Settlement to be Paid in Cash | 9,500,000,000 | |||||||||||||||||||||||||
| Proceeds from Legal Settlements | 3,200,000,000 | |||||||||||||||||||||||||
| FHFA Settlement, net cost | 6,300,000,000 | |||||||||||||||||||||||||
| FHFA Settlement, charge | 3,700,000,000 | |||||||||||||||||||||||||
| Loss Contingency, MBS Offerings, Securities Issued | $ 57,500,000,000 | |||||||||||||||||||||||||