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Receivables (Tables)
 9 Months Ended
Sep. 30, 2016
Receivables [Abstract]  
Schedule of Accounts Receivable
The components of receivables, net, consisted of the following:
 
 
September 30,
2016
 
January 1,
2016
 
 
(in millions)
Billed and billable receivables
 
$
756

 
$
715

Unbilled receivables:
 
 
 
 
Amounts billable
 
913

 
187

Contract retentions
 
18

 
29

Allowance for doubtful accounts
 
(10
)
 
(10
)
 
 
$
1,677

 
$
921