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
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Operating Leases, Future Minimum Payments Receivable [Abstract]    
Other commitment, remainder of fiscal year $ 600  
2019 2,300  
2020 2,100  
2021 1,900  
2022 1,600  
Thereafter 6,300  
Liquefied Natural Gas Commodities    
Loss Contingencies [Line Items]    
Other commitments $ 1,700 $ 1,500
Forward-Dated Securities Agreements    
Loss Contingencies [Line Items]    
Other commitment, period 15 months  
Forward-Dated Resale and Securities Borrowing Agreements    
Loss Contingencies [Line Items]    
Other commitments $ 80,200 56,800
Forward-Dated Repurchase and Securities Lending Agreements    
Loss Contingencies [Line Items]    
Other commitments 40,300 34,300
Auto Loans and Leases    
Loss Contingencies [Line Items]    
Other commitment, due in next twelve months $ 3,000 3,000
Other commitment, termination prior notice period 12 months  
Retail Automotive Loans    
Loss Contingencies [Line Items]    
Other commitments   345
Residential and Commercial Portfolio Segments | Residential and Commercial Financing Receivable | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 341 344
Commercial Portfolio Segment | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 764 $ 994