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 3 Months Ended 0 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
522110 Commercial Banking [Member]
Dec. 31, 2011
522110 Commercial Banking [Member]
Sep. 30, 2012
S P Es [Member]
Dec. 31, 2011
S P Es [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Dec. 31, 2011
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
Dec. 31, 2011
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
Sep. 30, 2012
Payment Guarantee [Member]
Dec. 31, 2011
Payment Guarantee [Member]
Sep. 30, 2012
Definitive Settlement Agreement [Member]
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]
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