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Equity Method Investments and Variable Interest Entities (Balance Sheet Amounts Related to Services Provided) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Accounts receivable, net of allowance for doubtful accounts $ 1,411 $ 899
Contract assets 224 178
Other current assets 147 121
Contract liabilities 313 356
Transactions with Related Parties    
Schedule of Equity Method Investments [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 35 83
Contract assets 2 2
Other current assets 25 0
Contract liabilities $ 5 $ 53