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New Accounting Standards (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reduction to income $ (254) $ (249) $ (688) $ (624)  
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201613Member    
Cumulative effect of change in accounting principle          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Tax impact of ASU 2016-13         $ 14
Financing Receivables and Unfunded Loan Commitments | Cumulative effect of change in accounting principle          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for expected credit losses         $ 65
Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reduction to income     $ 15