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Accounts Receivable, Net (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net were as follows:
(in millions)
 
June 30, 2017
 
December 31, 2016
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