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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Other commitment, due in next twelve months $ 2,400  
Operating Leases, Future Minimum Payments Receivable [Abstract]    
2019 2,400  
2020 2,200  
2021 2,000  
2022 1,700  
2023 1,300  
Thereafter 6,200  
Liquefied Natural Gas Commodities    
Loss Contingencies [Line Items]    
Other commitments $ 1,300 $ 1,500
Forward-Dated Securities Agreements    
Loss Contingencies [Line Items]    
Other commitment, period 12 months  
Forward-Dated Resale and Securities Borrowing Agreements    
Loss Contingencies [Line Items]    
Other commitments $ 59,700 56,800
Forward-Dated Repurchase and Securities Lending Agreements    
Loss Contingencies [Line Items]    
Other commitments 21,200 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  
Operating Leases, Future Minimum Payments Receivable [Abstract]    
2019 $ 3,000 3,000
Residential and Commercial Portfolio Segments | Residential and Commercial Financing Receivable | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments 329 344
Commercial Portfolio Segment | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 463 $ 994