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Restructuring Programs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Strategic transformation costs | $ 1 | $ 2 | $ 2 | $ 4
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 6 | 21
Provision |  |  | 22 | 31
Changes in estimates |  |  | (3) | 1
Total Net Current Period Charges | 7 | 27 | 19 | 32
Charges against reserve and currency |  |  | (21) | (37)
Balance at end of period | 4 | 16 | 4 | 16
Unallocated costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Total Net Current Period Charges | 5 | 18 | 17 | 21
Commercial Industries: | Operating Segments |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Total Net Current Period Charges | 2 | 5 | 2 | 7
Government Services: | Operating Segments |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Total Net Current Period Charges | 0 | 1 | 0 | 1
Transportation: | Operating Segments |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Total Net Current Period Charges | 0 | 3 | 0 | 3
Severance and Related Costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 3 | 15
Provision |  |  | 2 | 10
Changes in estimates |  |  | 0 | 0
Total Net Current Period Charges |  |  | 2 | 10
Charges against reserve and currency |  |  | (2) | (13)
Balance at end of period | 3 | 12 | 3 | 12
Termination and Other Costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 3 | 6
Provision |  |  | 16 | 10
Changes in estimates |  |  | (3) | 1
Total Net Current Period Charges |  |  | 13 | 11
Charges against reserve and currency |  |  | (15) | (13)
Balance at end of period | 1 | 4 | 1 | 4
Asset Impairments |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 0 | 0
Provision |  |  | 4 | 11
Changes in estimates |  |  | 0 | 0
Total Net Current Period Charges |  |  | 4 | 11
Charges against reserve and currency |  |  | (4) | (11)
Balance at end of period | 0 | 0 | 0 | 0
Data Center Consolidation [Member] | Termination and Other Costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Provision | $ 8 | $ 6 | $ 15 | $ 8

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