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Restructuring Programs (Tables)
6 Months Ended
Jun. 30, 2021
Restructuring and Related Activities [Abstract]  
Restructuring Program Activity
A summary of the Company's restructuring program activity during the six months ended June 30, 2021 and 2020 is as follows:

(in millions)Severance and Related CostsTermination and Other CostsAsset ImpairmentsTotal
Accrued Balance at December 31, 2020$$$— $
Provision16 22 
Changes in estimates— (3)— (3)
Total Net Current Period Charges(1)
13 19 
Charges against reserve and currency(2)(15)(4)(21)
Accrued Balance at June 30, 2021$$$— $
(in millions)Severance and Related CostsTermination and Other CostsAsset ImpairmentsTotal
Accrued Balance at December 31, 2019$15 $$— $21 
Provision10 10 11 31 
Changes in estimates— — 
Total Net Current Period Charges(1)
10 11 11 32 
Charges against reserve and currency(13)(13)(11)(37)
Accrued Balance at June 30, 2020$12 $$— $16 
Total Costs incurred with Restructuring programs, by segment
The following table summarizes the total amount of costs incurred in connection with these restructuring programs by reportable and non-reportable segment:
 Three Months Ended
June 30,
Six Months Ended
June 30,
(in millions)2021202020212020
Commercial Industries$$$$
Government Services— — 
Transportation— — 
Unallocated Costs(1)
18 17 21 
Total Net Restructuring Charges$$27 $19 $32