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Commitments and Contingencies - Additional Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | ||||||||||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Commercial Bank [Member]
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Dec. 31, 2013
Commercial Bank [Member]
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Jun. 30, 2014
Variable Interest Entities [Member]
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Dec. 31, 2013
Variable Interest Entities [Member]
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Jun. 30, 2014
FGIC [Member]
trust
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Aug. 06, 2013
DOJ and SEC [Member]
claim
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Jun. 30, 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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Jun. 30, 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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Jun. 30, 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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Jun. 30, 2014
Payment Guarantee [Member]
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Dec. 31, 2013
Payment Guarantee [Member]
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Jul. 15, 2014
Subsequent Event [Member]
AIG Litigation [Member]
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Jul. 18, 2014
Subsequent Event [Member]
Interchange and Related Litigation [Member]
claim
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| Guarantor Obligations [Line Items] | |||||||||||||||||||||
| Unfunded equity investment commitments | $ 92,000,000 | $ 92,000,000 | $ 195,000,000 | ||||||||||||||||||
| Commitment to purchase residential mortgage and commercial real estate loans | 3,200,000,000 | 3,200,000,000 | 1,500,000,000 | ||||||||||||||||||
| Forward Dated Resale and Securities Borrowing Agreements Commitment | 105,300,000,000 | 105,300,000,000 | 75,500,000,000 | ||||||||||||||||||
| Forward Dated Repurchase And Securities Lending Agreements Commitment | 72,800,000,000 | 72,800,000,000 | 38,300,000,000 | ||||||||||||||||||
| Operating Leases, Future Minimum Payments Due [Abstract] | |||||||||||||||||||||
| 2014 | 1,400,000,000 | 1,400,000,000 | |||||||||||||||||||
| 2015 | 2,500,000,000 | 2,500,000,000 | |||||||||||||||||||
| 2016 | 2,200,000,000 | 2,200,000,000 | |||||||||||||||||||
| 2017 | 1,800,000,000 | 1,800,000,000 | |||||||||||||||||||
| 2018 | 1,400,000,000 | 1,400,000,000 | |||||||||||||||||||
| Thereafter | 5,900,000,000 | 5,900,000,000 | |||||||||||||||||||
| Notional Amount of Derivatives | 1,302,648,000,000 | 1,302,648,000,000 | 1,328,787,000,000 | 656,000,000 | 1,800,000,000 | 1,100,000,000 | 1,300,000,000 | 13,500,000,000 | 13,400,000,000 | 3,100,000,000 | 3,000,000,000 | 2,000,000,000 | 4,600,000,000 | ||||||||
| Life Insurance Book Value Protection, Fair Value Liability | 32,000,000 | 32,000,000 | 39,000,000 | ||||||||||||||||||
| Merchant Services Transactions Processed And Settled By Sponsored Entitites | 164,300,000,000 | 157,900,000,000 | 313,700,000,000 | 306,200,000,000 | |||||||||||||||||
| Losses As Result Of Cardholder Disputed Transactions | 4,000,000 | 4,000,000 | 8,000,000 | 8,000,000 | |||||||||||||||||
| Noncontrolling Interest, Ownership Percentage by Parent | 49.00% | 49.00% | |||||||||||||||||||
| Merchant escrow deposits held as collateral | 116,000,000 | 116,000,000 | 203,000,000 | ||||||||||||||||||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 253,000,000,000 | 253,000,000,000 | 258,500,000,000 | 6,500,000,000 | 6,900,000,000 | ||||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 242,000,000 | 242,000,000 | 381,000,000 | ||||||||||||||||||
| Payment Protection Insurance Claims Expense | 43,000,000 | 29,000,000 | 184,000,000 | 29,000,000 | |||||||||||||||||
| Litigation Settlement, Expense | 4,000,000,000 | 471,000,000 | 10,000,000,000 | 2,700,000,000 | |||||||||||||||||
| Loss Contingency, Range of Possible Loss, Minimum | 0 | 0 | |||||||||||||||||||
| Loss Contingency, Range of Possible Loss, Maximum | 5,000,000,000.0 | 5,000,000,000.0 | |||||||||||||||||||
| Number Of Trusts Involved In Settlement Agreement | 2 | ||||||||||||||||||||
| Loss Contingency, Pending Claims, Number | 1 | ||||||||||||||||||||
| Payments for Legal Settlements | $ 650,000,000 | ||||||||||||||||||||
| offering materials related to RMBS | 1 | ||||||||||||||||||||