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Equity Method Investments and Variable Interest Entities (Related Party Disclosures) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Accounts receivable, net of allowance for credit losses $ 934 $ 899
Contract assets 183 178
Contract liabilities 278 356
Transactions with Related Parties    
Schedule of Equity Method Investments [Line Items]    
Accounts receivable, net of allowance for credit losses 53 83
Contract assets 1 2
Contract liabilities $ 11 $ 53