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Accounts Receivable, Net - Schedule of Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade receivables $ 2,901 $ 2,723
Unbilled receivables 120 108
Miscellaneous receivables 93 113
Total receivables 3,114 2,944
Less: allowance for expected credit losses (156) (83)
Balance $ 2,958 $ 2,861