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Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Accounts receivable $ 1,429 $ 1,303
Less: allowance for doubtful accounts (66) (65)
Net trade receivables 1,363 1,238
Unbilled receivables 245 181
Miscellaneous receivables 222 183
Receivables, net $ 1,830 $ 1,602