Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Other Commitments (Details)

v3.8.0.1
Commitments and Contingencies - Other Commitments (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Operating Leases, Future Minimum Payments Receivable [Abstract]    
Other commitment, remainder of fiscal year $ 1,700  
2019 2,200  
2020 2,000  
2021 1,700  
2022 1,400  
Thereafter 6,000  
Liquefied Natural Gas Commodities    
Loss Contingencies [Line Items]    
Other commitments 1,400 $ 1,500
Forward-Dated Resale and Securities Borrowing Agreements    
Loss Contingencies [Line Items]    
Other commitments 89,700 56,800
Forward-Dated Repurchase and Securities Lending Agreements    
Loss Contingencies [Line Items]    
Other commitments 46,400 34,300
Retail Automotive Loans    
Loss Contingencies [Line Items]    
Other commitments   345
Auto Loans and Leases [Member]    
Loss Contingencies [Line Items]    
Other commitment, due in next twelve months 3,000  
Residential and Commercial Portfolio Segments | Residential and Commercial Financing Receivable | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments 399 344
Commercial Portfolio Segment | Loan Purchase Commitments    
Loss Contingencies [Line Items]    
Other commitments $ 450 $ 994