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
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Operating Leases, Future Minimum Payments Receivable [Abstract]    
Other commitment, remainder of fiscal year $ 1,100  
2019 2,200  
2020 2,100  
2021 1,800  
2022 1,500  
Thereafter 6,200  
Liquefied Natural Gas Commodities    
Loss Contingencies [Line Items]    
Other commitments $ 1,500 $ 1,500
Forward-Dated Securities Agreements    
Loss Contingencies [Line Items]    
Other Commitment, Period 18 months  
Forward-Dated Resale and Securities Borrowing Agreements    
Loss Contingencies [Line Items]    
Other commitments $ 76,400 56,800
Forward-Dated Repurchase and Securities Lending Agreements    
Loss Contingencies [Line Items]    
Other commitments 45,800 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 $ 455 344
Commercial Portfolio Segment | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 473 $ 994