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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Operating Leases, Future Minimum Payments Due [Abstract]          
Remainder of 2015 $ 640,000,000   $ 640,000,000    
2016 2,400,000,000   2,400,000,000    
2017 2,100,000,000   2,100,000,000    
2018 1,700,000,000   1,700,000,000    
2019 1,400,000,000   1,400,000,000    
Thereafter 5,500,000,000   5,500,000,000    
Litigation expense 231,000,000 $ 6,000,000,000 776,000,000 $ 16,000,000,000  
Minimum estimate range of possible loss 0   0    
Maximum estimated range of possible loss 2,400,000,000.0   2,400,000,000.0    
Commercial Banks          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional amount of derivatives 396,000,000   396,000,000   $ 527,000,000
Unconsolidated VIEs          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional amount of derivatives 980,000,000   980,000,000   1,200,000,000
Life Insurance Book Value Protection          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional amount of derivatives 13,700,000,000   13,700,000,000   13,600,000,000
Maximum potential exposure 3,100,000,000   3,100,000,000   3,100,000,000
Net fair value of bank-owned life insurance book value protection 14,000,000   14,000,000   25,000,000
Other Guarantee          
Operating Leases, Future Minimum Payments Due [Abstract]          
Maximum potential exposure 6,100,000,000   6,100,000,000   6,200,000,000
Loan Commitments          
Loss Contingencies [Line Items]          
Other commitments 559,000,000   559,000,000   1,800,000,000
Commodities Investment          
Loss Contingencies [Line Items]          
Other commitments 2,600,000,000   2,600,000,000   241,000,000
Forward-Dated Resale and Securities Borrowing Agreements          
Loss Contingencies [Line Items]          
Other commitments 121,500,000,000   121,500,000,000   73,200,000,000
Forward-Dated Repurchase and Securities Lending Agreements          
Loss Contingencies [Line Items]          
Other commitments 96,600,000,000   96,600,000,000   55,800,000,000
Payment Protection Insurance          
Operating Leases, Future Minimum Payments Due [Abstract]          
Loss contingency accrual 434,000,000   434,000,000   $ 378,000,000
Provision (benefit) $ 303,000,000 298,000,000 $ 319,000,000 482,000,000  
Merchant Servicing Joint Venture          
Operating Leases, Future Minimum Payments Due [Abstract]          
Equity method investment ownership percentage 49.00%   49.00%   49.00%
Merchant Processing Servicers, Sponsored Entities          
Operating Leases, Future Minimum Payments Due [Abstract]          
Transactions processed and settled by sponsored entities $ 168,600,000,000 162,700,000,000 $ 494,200,000,000 476,400,000,000  
Losses as result of cardholder disputed transactions 6,000,000 $ 3,000,000 16,000,000 $ 11,000,000  
Merchant escrow deposits held as collateral 165,000,000   165,000,000   $ 130,000,000
Merchant Processing Servicers, Sponsored Entities | Merchant Services          
Operating Leases, Future Minimum Payments Due [Abstract]          
Maximum potential exposure $ 274,600,000,000   274,600,000,000   $ 269,300,000,000
Pennsylvania Public School Employees' Retirement System          
Operating Leases, Future Minimum Payments Due [Abstract]          
Litigation settlement     $ 335,000,000