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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Schedule Of Contract Assets And Liabilities [Line Items]      
Deferred customer acquisition costs $ 111   $ 133
Total accounts receivable, net 3,291   3,245
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) 1,237   1,574
Deferred revenues 177   227
Deferred revenue from contract with customers 169   224
Revenue recognized 117 $ 23  
Accounts receivable, net - Contracts with customers      
Schedule Of Contract Assets And Liabilities [Line Items]      
Total accounts receivable, net 3,091   3,057
Accounts receivable, net - Derivative instruments      
Schedule Of Contract Assets And Liabilities [Line Items]      
Total accounts receivable, net 197   182
Accounts receivable, net - Affiliate      
Schedule Of Contract Assets And Liabilities [Line Items]      
Total accounts receivable, net $ 3   $ 6