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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Receivables [Abstract]          
Amounts billed or billable $ 1,067   $ 1,067   $ 963
Unbilled amounts 360   360   289
Allowance for doubtful accounts (7)   (7)   (6)
Accounts Receivable, Net 1,420   1,420   1,246
Billable contracts receivable to be invoiced in the subsequent month 464   464   443
Accounts Receivable Sales Arrangements [Abstract]          
Remaining account receivable sold and derecognized 63   63   $ 136
Accounts Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable sales 74 $ 60 228 $ 179  
Estimated increase (decrease) to operating cash flows [1] $ (1) $ 1 $ (73) $ (19)  
[1] Represents the difference between current and prior period receivable sales adjusted for the effects of: (i) the deferred proceeds, (ii) collections prior to the end of the quarter and, (iii) currency.