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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts receivable
Accounts receivable consisted of the following:
 
 
December 31
$ in millions
 
2017
 
2016
Due from U.S. Government (1)
 
 
 
 
Billed
 
$
656

 
$
482

Unbilled
 
10,818

 
9,730

Progress and performance-based payments received
 
(8,068
)
 
(7,484
)
 Total due from U.S. Government
 
3,406

 
2,728

Due from International and Other Customers
 
 
 
 
Billed
 
218

 
200

Unbilled
 
3,397

 
3,895

Progress and performance-based payments received
 
(2,966
)
 
(3,461
)
Total due from International and Other Customers
 
649

 
634

Total accounts receivable
 
4,055

 
3,362

Allowance for doubtful accounts
 
(79
)
 
(63
)
Total accounts receivable, net
 
$
3,976

 
$
3,299


(1) 
Includes receivables due from the U.S. Government associated with foreign military sales (FMS). For FMS, we contract with and are paid by the U.S. Government.