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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts Receivable, Net
4. ACCOUNTS RECEIVABLE, NET
Unbilled amounts represent sales for which billings have not been presented to customers by period-end. These amounts are usually billed and collected within one year. Substantially all accounts receivable at December 31, 2015 are expected to be collected in 2016. The company does not believe it has significant exposure to credit risk, as accounts receivable and the related unbilled amounts are primarily from contracts where the U.S. Government is the primary customer.
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


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