Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

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Commitments and Contingencies - Additional Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Guarantor Obligations [Line Items]          
Unfunded equity investment commitments $ 235,000,000   $ 235,000,000   $ 307,000,000
Commitment to purchase residential mortgage and commercial real estate loans 1,400,000,000   1,400,000,000   1,300,000,000
Forward Dated Resale and Securities Borrowing Agreements Commitment 92,300,000,000   92,300,000,000   67,300,000,000
Forward Dated Repurchase And Securities Lending Agreements Commitment 59,100,000,000   59,100,000,000   42,300,000,000
Operating Leases, Future Minimum Payments Due [Abstract]          
2013 731,000,000   731,000,000    
2014 2,700,000,000   2,700,000,000    
2015 2,400,000,000   2,400,000,000    
2016 2,000,000,000   2,000,000,000    
2017 1,600,000,000   1,600,000,000    
Thereafter 7,100,000,000   7,100,000,000    
Notional Amount of Derivatives 1,495,423,000,000   1,495,423,000,000   1,600,315,000,000
Life Insurance Book Value Protection, Fair Value Liability 42,000,000   42,000,000   52,000,000
Merchant Services Transactions Processed And Settled By Sponsored Entitites 154,700,000,000 153,900,000,000 460,900,000,000 442,700,000,000  
Losses As Result Of Cardholder Disputed Transactions 4,000,000 3,000,000 12,000,000 7,000,000  
Noncontrolling Interest, Ownership Percentage by Parent 49.00%   49.00%    
Merchant escrow deposits held as collateral 207,000,000   207,000,000   202,000,000
Guarantor Obligations, Maximum Exposure, Undiscounted 260,400,000,000   260,400,000,000   263,900,000,000
Loss Contingency Accrual, at Carrying Value 300,000,000   300,000,000   510,000,000
Payment Protection Insurance Claims Expense 66,000,000 267,000,000 95,000,000 467,000,000  
Litigation Settlement, Expense 1,100,000,000 1,600,000,000 3,800,000,000 3,300,000,000  
Loss Contingency, Range of Possible Loss, Minimum 0   0    
Loss Contingency, Range of Possible Loss, Maximum 5,100,000,000   5,100,000,000    
522110 Commercial Banking [Member]
          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional Amount of Derivatives 2,400,000,000   2,400,000,000   2,900,000,000
S P Es [Member]
          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional Amount of Derivatives 1,400,000,000   1,400,000,000   1,400,000,000
Financial Guarantee [Member] | Guarantee Life Insurance Book Value Protection Derivative [Member]
          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional Amount of Derivatives 13,300,000,000   13,300,000,000   13,400,000,000
Financial Guarantee [Member] | Guarantee Life Insurance Book Value Protection Derivative [Member] | Maximum [Member]
          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional Amount of Derivatives 3,000,000,000   3,000,000,000   3,000,000,000
Financial Guarantee [Member] | Guarantee Employee Retirement Protection Derivative [Member]
          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional Amount of Derivatives 6,100,000,000   6,100,000,000   18,400,000,000
Payment Guarantee [Member]
          
Operating Leases, Future Minimum Payments Due [Abstract]          
Registration Payment Arrangement, Maximum Potential Consideration $ 6,700,000,000   $ 6,700,000,000   $ 6,800,000,000