Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Other Commitments (Details)

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Commitments and Contingencies - Other Commitments (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
2017 $ 1,200  
2018 2,200  
2019 2,000  
2020 1,800  
2021 1,500  
Thereafter 5,700  
Liquefied Natural Gas Commodities    
Loss Contingencies [Line Items]    
Other commitments 1,600 $ 1,900
Forward-Dated Resale and Securities Borrowing Agreements    
Loss Contingencies [Line Items]    
Other commitments 74,200 48,900
Forward-Dated Repurchase and Securities Lending Agreements    
Loss Contingencies [Line Items]    
Other commitments 41,300 24,400
Retail Automotive Loans    
Loss Contingencies [Line Items]    
Other commitments 345 475
Auto Loans and Leases    
Loss Contingencies [Line Items]    
Other commitment, due this year 1,500  
Residential and Commercial Portfolio Segments | Residential and Commercial Financing Receivable | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments 598 767
Commercial Portfolio Segment | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 2,700 $ 636