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 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
522110 Commercial Banking [Member]
Dec. 31, 2012
522110 Commercial Banking [Member]
Mar. 31, 2013
S P Es [Member]
Mar. 31, 2013
Luther Litigation [Member]
offering
Mar. 31, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Mar. 31, 2013
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
Mar. 31, 2013
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
Dec. 31, 2012
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
Mar. 31, 2013
Payment Guarantee [Member]
Dec. 31, 2012
Payment Guarantee [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]
Mar. 31, 2013
Luther Litigation [Member]
Guarantor Obligations [Line Items]                                
Unfunded equity investment commitments $ 275,000,000   $ 307,000,000                          
Commitment to purchase residential mortgage and commercial real estate loans 1,700,000,000   1,300,000,000                          
Forward Dated Resale and Securities Borrowing Agreements Commitment 86,900,000,000   67,300,000,000                          
Forward Dated Repurchase And Securities Lending Agreements Commitment 56,900,000,000   42,300,000,000                          
Operating Leases, Future Minimum Payments Due [Abstract]                                
2013 2,277,000,000                              
2014 2,600,000,000                              
2015 2,300,000,000                              
2016 1,900,000,000                              
2017 1,500,000,000                              
Thereafter 6,700,000,000                              
Notional Amount of Derivatives 1,655,235,000,000   1,600,315,000,000 2,600,000,000 2,900,000,000 1,400,000,000   13,200,000,000 13,400,000,000 3,000,000,000 15,700,000,000 18,400,000,000        
Life Insurance Book Value Protection, Fair Value Liability 49,000,000   52,000,000                          
Merchant Services Transactions Processed And Settled By Sponsored Entitites 148,300,000,000 133,200,000,000                            
Losses As Result Of Cardholder Disputed Transactions 4,000,000 2,000,000                            
Merchant escrow deposits held as collateral 226,000,000   202,000,000                          
Guarantor Obligations, Maximum Exposure, Undiscounted 259,100,000,000   263,900,000,000                          
Registration Payment Arrangement, Maximum Potential Consideration                         3,300,000,000 3,100,000,000    
Loss Contingency Accrual, at Carrying Value 391,000,000   510,000,000                          
Payment Protection Insurance Claims Expense 0 200,000,000                            
Loss Contingency, Loss in Period                               500,000,000
Litigation Settlement, Expense 2,200,000,000 793,000,000                            
Litigation Settlement Distribution of Amount Equal to Interchange Rate Basis Points                             0.00%  
Loss Contingency, Range of Possible Loss, Minimum 0                              
Loss Contingency, Range of Possible Loss, Maximum $ 2,600,000,000                              
Loss Contingency, Cases Filed Against Other Financial Institutions, Number             429