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Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Accounts receivable $ 1,411 $ 1,303
Less: allowance for doubtful accounts (64) (65)
Net trade receivables 1,347 1,238
Unbilled receivables 236 181
Miscellaneous receivables 212 183
Receivables, net $ 1,795 $ 1,602