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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Schedule Of Contract Assets And Liabilities [Line Items]        
Deferred customer acquisition costs $ 116     $ 113
Total accounts receivable, net 3,037     904
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 1,234     393
Deferred revenues 258     60
Deferred revenue from contract with customers 232   $ 31  
Revenue recognized 23 $ 13    
Accounts receivable, net - Contracts with customers        
Schedule Of Contract Assets And Liabilities [Line Items]        
Total accounts receivable, net 2,920     866
Accounts receivable, net - Derivative instruments        
Schedule Of Contract Assets And Liabilities [Line Items]        
Total accounts receivable, net 113     33
Accounts receivable, net - Affiliate        
Schedule Of Contract Assets And Liabilities [Line Items]        
Total accounts receivable, net $ 4     $ 5