XML 45 R34.htm IDEA: XBRL DOCUMENT v3.7.0.1
Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Amounts billed or billable $ 1,116 $ 1,014
Unbilled amounts 262 279
Allowance for doubtful accounts (4) (7)
Accounts Receivable, Net 1,374 1,286
Billable contracts receivable to be invoiced in the subsequent month $ 414 $ 429