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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts receivable
Accounts receivable consisted of the following:
 
 
December 31
$ in millions
 
2018
 
2017
Due from U.S. government (1)
 
$
1,164

 
$
825

Due from international and other customers
 
318

 
268

Accounts receivable, gross
 
1,482

 
1,093

Allowance for doubtful accounts
 
(34
)
 
(39
)
Accounts receivable, net
 
$
1,448

 
$
1,054


(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.