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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule Of Contract Assets And Liabilities [Line Items]          
Deferred customer acquisition costs $ 133   $ 133   $ 133
Total accounts receivable, net 1,015   1,015   1,025
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 328   328   402
Deferred revenues 84   84   82
Deferred revenue from contract with customers 33       24
Revenue recognized 25 $ 19 13 $ 13  
Accounts receivable, net - Contracts with customers          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net 981   981   1,002
Accounts receivable, net - Derivative instruments          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net 30   30   18
Accounts receivable, net - Affiliate          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net $ 4   $ 4   $ 5