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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule Of Contract Assets And Liabilities [Line Items]          
Deferred customer acquisition costs $ 123   $ 123   $ 111
Total accounts receivable, net 1,062   1,062   1,024
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 403   403   392
Deferred revenues 89   89   67
Deferred revenue from contract with customers     31   19
Revenue recognized 19 $ 16 13 $ 16  
Accounts receivable, net - Contracts with customers          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net 1,015   1,015   999
Accounts receivable, net - Derivative instruments          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net 43   43   20
Accounts receivable, net - Affiliate          
Schedule Of Contract Assets And Liabilities [Line Items]          
Total accounts receivable, net $ 4   $ 4   $ 5