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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Operating Leases, Future Minimum Payments Due [Abstract]          
Remainder of 2016 $ 604,000,000   $ 604,000,000    
2017 2,300,000,000   2,300,000,000    
2018 2,000,000,000   2,000,000,000    
2019 1,700,000,000   1,700,000,000    
2020 1,500,000,000   1,500,000,000    
Thereafter 5,400,000,000   5,400,000,000    
Deposit insurance increase per quarter     100,000,000    
Litigation expense 250,000,000 $ 231,000,000 908,000,000 $ 776,000,000  
Merchant Processing Servicers, Sponsored Entities          
Operating Leases, Future Minimum Payments Due [Abstract]          
Transactions processed and settled by sponsored entities 189,900,000,000 168,600,000,000 527,700,000,000 494,200,000,000  
Losses as result of cardholder disputed transactions 9,000,000 6,000,000 23,000,000 16,000,000  
Merchant escrow deposits held as collateral 175,000,000   175,000,000   $ 181,000,000
Minimum          
Operating Leases, Future Minimum Payments Due [Abstract]          
Estimate of possible loss 0   0    
Maximum          
Operating Leases, Future Minimum Payments Due [Abstract]          
Estimate of possible loss 1,100,000,000   1,100,000,000    
Payment Protection Insurance          
Operating Leases, Future Minimum Payments Due [Abstract]          
Loss contingency accrual 165,000,000   165,000,000   360,000,000
Provision (benefit) 0 $ 13,000,000 303,000,000 $ 319,000,000  
Life Insurance Book Value Protection          
Operating Leases, Future Minimum Payments Due [Abstract]          
Notional amount of derivatives 13,900,000,000   13,900,000,000   13,800,000,000
Maximum potential exposure 3,200,000,000   3,200,000,000   3,100,000,000
Net fair value of bank-owned life insurance book value protection 6,000,000   6,000,000   12,000,000
Merchant Services | Merchant Processing Servicers, Sponsored Entities          
Operating Leases, Future Minimum Payments Due [Abstract]          
Maximum potential exposure 302,100,000,000   302,100,000,000   277,100,000,000
Other Guarantee          
Operating Leases, Future Minimum Payments Due [Abstract]          
Maximum potential exposure 6,500,000,000   6,500,000,000   6,000,000,000
Commodities Investment          
Loss Contingencies [Line Items]          
Other commitments 1,900,000,000   1,900,000,000   1,900,000,000
Forward-Dated Resale and Securities Borrowing Agreements          
Loss Contingencies [Line Items]          
Other commitments 50,000,000,000   50,000,000,000   88,600,000,000
Forward-Dated Repurchase and Securities Lending Agreements          
Loss Contingencies [Line Items]          
Other commitments 28,600,000,000   28,600,000,000   53,700,000,000
Retail Automotive Loans          
Loss Contingencies [Line Items]          
Other commitments 1,800,000,000   1,800,000,000   1,200,000,000
Auto Loans and Leases          
Loss Contingencies [Line Items]          
Other commitment due in the remainder of 2016 620,000,000   620,000,000    
Other commitment due in 2017 $ 2,400,000,000   $ 2,400,000,000    
Merchant Servicing Joint Venture          
Operating Leases, Future Minimum Payments Due [Abstract]          
Equity method investment ownership percentage 49.00%   49.00%    
Residential and Commercial Portfolio Segments | Residential and Commercial Financing Receivable | Loan Commitments          
Loss Contingencies [Line Items]          
Other commitments $ 902,000,000   $ 902,000,000   729,000,000
Commercial | Loan Commitments          
Loss Contingencies [Line Items]          
Other commitments $ 630,000,000   $ 630,000,000   $ 874,000,000