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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule Of Contract Assets And Liabilities [Line Items]      
Deferred customer acquisition costs $ 133   $ 133
Total accounts receivable, net 915   1,025
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 328   402
Deferred revenues 87   82
Deferred revenue from contract with customers 27   24
Revenue recognized 13 $ 13  
Accounts receivable, net - Contracts with customers      
Schedule Of Contract Assets And Liabilities [Line Items]      
Total accounts receivable, net 885   1,002
Accounts receivable, net - Derivative instruments      
Schedule Of Contract Assets And Liabilities [Line Items]      
Total accounts receivable, net 26   18
Accounts receivable, net - Affiliate      
Schedule Of Contract Assets And Liabilities [Line Items]      
Total accounts receivable, net $ 4   $ 5