Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Other Commitments (Details)

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Commitments and Contingencies - Other Commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Receivable [Abstract]    
2018 $ 2,300  
2019 2,100  
2020 1,900  
2021 1,700  
2022 1,400  
Thereafter 5,100  
Liquefied Natural Gas Commodities    
Loss Contingencies [Line Items]    
Other commitments 1,500 $ 1,900
Forward-Dated Resale and Securities Borrowing Agreements    
Loss Contingencies [Line Items]    
Other commitments 56,800 48,900
Forward-Dated Repurchase and Securities Lending Agreements    
Loss Contingencies [Line Items]    
Other commitments 34,300 24,400
Retail Automotive Loans    
Loss Contingencies [Line Items]    
Other commitments 345 475
Auto Loans and Leases    
Operating Leases, Future Minimum Payments Receivable [Abstract]    
Other commitment, due next year 3,000  
Residential and Commercial Portfolio Segments | Residential and Commercial Financing Receivable | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments 344 767
Commercial Portfolio Segment | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 994 $ 636