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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule Of Contract Assets And Liabilities [Line Items]          
Deferred customer acquisition costs $ 122   $ 122   $ 133
Total accounts receivable, net 1,126   1,126   1,025
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 411   411   402
Deferred revenues 60   60   82
Deferred revenue from contract with customers 31       24
Revenue recognized 31 $ 21 13 $ 13  
Accounts receivable, net - Contracts with customers          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net 1,084   1,084   1,002
Accounts receivable, net - Derivative instruments          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net 37   37   18
Accounts receivable, net - Affiliate          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net $ 5   $ 5   $ 5