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Accounts Receivable
 12 Months Ended
Dec. 31, 2018
Accounts Receivable, Net [Abstract]  
Accounts Receivable Accounts Receivable, net
Accounts receivable at December 31 consisted of the following:
 
2018

 
2017

Commercial customer contracts

$2,059

 

$1,560

U.S. government contracts(1)
1,877

 
1,396

Less valuation allowance
(57
)
 
(62
)
Total

$3,879

 

$2,894


(1) 
Includes foreign military sales through the U.S. government
Accounts receivable expected to be collected after one year are not material.