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New Accounting Standards (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for expected credit losses $ 99   $ 33
Retained earnings (accumulated deficit) $ 51   $ (25)
Cumulative Effect, Period Of Adoption, Adjustment, Pre-tax      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for expected credit losses   $ 62  
Retained earnings (accumulated deficit)   (65)  
Cumulative Effect, Period Of Adoption, Adjustment, Tax      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings (accumulated deficit)   14  
Financing Receivables and Unfunded Loan Commitments | Cumulative Effect, Period Of Adoption, Adjustment, Pre-tax      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for expected credit losses   $ 65