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Accounts Receivable
12 Months Ended
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Accounts Receivable Accounts Receivable, net
Accounts receivable at December 31 consisted of the following:
20202019
U.S. government contracts(1)
$811 $1,121 
Commercial Airplanes17 29 
Global Services(2)
1,437 1,967 
Defense, Space, & Security(2)
120 220 
Other14 
Less valuation allowance(444)(73)
Total$1,955 $3,266 
(1)Includes foreign military sales through the U.S. government
(2)Excludes U.S. government contracts
Our valuation allowance was increased from $73 to $138 on January 1, 2020 upon adoption of ASU 2016-13. See note 6. Accounts receivable expected to be collected after one year are not material.