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Contracts in Process, Net
 12 Months Ended
Dec. 31, 2016
Contract in Process Net [Abstract]  
Contracts in Process, Net
Contracts in Process, Net
Contracts in process, net, consisted of the following at December 31: 
 
Cost-Type
 
Fixed-Price
 
Total
(In millions)
2016

 
2015

 
2016

 
2015

 
2016

 
2015

U.S. government contracts (including foreign military sales):
 
 
 
 
 
 
 
 
 
 
 
Billed
$
343

 
$
432

 
$
195

 
$
196

 
$
538

 
$
628

Unbilled
990

 
867

 
7,957

 
8,381

 
8,947

 
9,248

Progress payments
—

 
—

 
(5,608
)
 
(5,752
)
 
(5,608
)
 
(5,752
)
 
1,333

 
1,299

 
2,544

 
2,825

 
3,877

 
4,124

Other customers:
 
 
 
 
 
 
 
 
 
 
 
Billed
19

 
22

 
669

 
524

 
688

 
546

Unbilled
54

 
21

 
1,997

 
1,317

 
2,051

 
1,338

Progress payments
—

 
—

 
(406
)
 
(439
)
 
(406
)
 
(439
)
 
73

 
43

 
2,260

 
1,402

 
2,333

 
1,445

Allowance for doubtful accounts
—

 
—

 
(8
)
 
(5
)
 
(8
)
 
(5
)
Total contracts in process, net
$
1,406

 
$
1,342

 
$
4,796

 
$
4,222

 
$
6,202

 
$
5,564



The U.S. government has title to the assets related to unbilled amounts on contracts that provide progress payments. Unbilled amounts are recorded under the percentage-of-completion method and are recoverable from the customer upon shipment of the product, presentation of billings or completion of the contract. Included in unbilled at December 31, 2016 was $154 million which is expected to be collected outside of one year.
 
Billed and unbilled contracts in process include retentions arising from contractual provisions. At December 31, 2016, retentions were $72 million. We anticipate collecting $10 million of these retentions in 2017 and the balance thereafter.