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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
737 MAX Customer Concessions and Other Considerations Liability
The following table summarizes changes in the 737 MAX customer concessions and other considerations liability during the three months ended March 31, 2021 and 2020.
20212020
Beginning balance – January 1$5,537 $7,389 
Reductions for payments made(1,172)(671)
Reductions for concessions and other in-kind considerations(25)(2)
Changes in estimates30 (30)
Ending balance – March 31$4,370 $6,686 
Environmental
The following table summarizes environmental remediation activity during the three months ended March 31, 2021 and 2020.
20212020
Beginning balance – January 1$565 $570 
Reductions for payments made(13)(9)
Changes in estimates15 7 
Ending balance – March 31$567 $568 
Product Warranties
The following table summarizes product warranty activity recorded during the three months ended March 31, 2021 and 2020.
20212020
Beginning balance – January 1$1,527 $1,267 
Additions for current year deliveries17 23 
Reductions for payments made(44)(82)
Changes in estimates234 341 
Ending balance – March 31$1,734 $1,549 
Financing Commitments The estimated earliest potential funding dates for these commitments as of March 31, 2021 are as follows:

Total
April through December 2021$2,166 
20221,667 
20233,839 
20242,328 
20251,934 
Thereafter1,449 
$13,383 
Severance Liability [Table Text Block]
The following table summarizes changes in the severance liability during 2021:
2021
Beginning balance – January 1$283 
Reductions for payments made(48)
Changes in estimates(75)
Ending balance – March 31$160