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Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Receivables [Abstract]      
Accounts receivable $ 1,396   $ 894
Less: allowance for doubtful accounts (75)   (71)
Net trade receivables 1,321   823
Unbilled receivables 229   0
Miscellaneous receivables 240   218
Receivables, net $ 1,790 $ 1,195 $ 1,041