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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Accounts receivable
Accounts receivable consisted of the following:
 
 
December 31
$ in millions
 
2016
 
2015
Due from U.S. Government
 
 
 
 
Billed
 
$
444

 
$
506

Unbilled
 
8,878

 
7,699

Progress and performance-based payments received
 
(7,123
)
 
(6,140
)
 
 
2,199

 
2,065

Due from International and Other Customers(1)
 
 
 
 
Billed
 
238

 
223

Unbilled
 
4,747

 
3,713

Progress and performance-based payments received
 
(3,822
)
 
(3,101
)
 
 
1,163

 
835

Total accounts receivable
 
3,362

 
2,900

Allowance for doubtful accounts
 
(63
)
 
(59
)
Total accounts receivable, net
 
$
3,299

 
$
2,841


(1) 
Includes receivables due from the U.S. Government associated with foreign military sales.