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Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Accounts receivable $ 1,299 $ 1,084
Less: allowance for credit losses (27) (20)
Net trade receivables 1,272 1,064
Unbilled receivables 288 248
Miscellaneous receivables 280 210
Receivables, net $ 1,840 $ 1,522