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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts receivable
Accounts receivable consisted of the following:
 
 
December 31
$ in millions
 
2015
 
2014
Due from U.S. Government
 
 
 
 
Billed
 
$
506

 
$
536

Unbilled
 
7,699

 
6,806

Progress and performance-based payments received
 
(6,140
)
 
(5,150
)
 
 
2,065

 
2,192

Due from International and Other Customers(1)
 
 
 
 
Billed
 
223

 
283

Unbilled
 
3,713

 
3,461

Progress and performance-based payments received
 
(3,101
)
 
(3,062
)
 
 
835

 
682

Total accounts receivable
 
2,900

 
2,874

Allowance for doubtful accounts
 
(59
)
 
(68
)
Total accounts receivable, net
 
$
2,841

 
$
2,806