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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule Of Contract Assets And Liabilities [Line Items]            
Deferred customer acquisition costs $ 124     $ 124   $ 113
Total accounts receivable, net 3,096     3,096   904
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 1,268     1,268   393
Deferred revenues 312     312   60
Deferred revenue from contract with customers   $ 31   303    
Revenue recognized 162   $ 31 23 $ 13  
Accounts receivable, net - Contracts with customers            
Schedule Of Contract Assets And Liabilities [Line Items]            
Total accounts receivable, net 2,955     2,955   866
Accounts receivable, net - Derivative instruments            
Schedule Of Contract Assets And Liabilities [Line Items]            
Total accounts receivable, net 136     136   33
Accounts receivable, net - Affiliate            
Schedule Of Contract Assets And Liabilities [Line Items]            
Total accounts receivable, net $ 5     $ 5   $ 5