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Restructuring Charges and Asset Impairments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | $ 116 |
Asset Impairments |  | 98 |
Total Restructuring Charges & Asset Impairments | $ 2 | 214 | $ 0
Government Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 2 |
Asset Impairments |  | 2 |
Total Restructuring Charges & Asset Impairments |  | 4 |
Sustainable Technology Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 39 |
Asset Impairments |  | 47 |
Total Restructuring Charges & Asset Impairments |  | 86 |
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 75 |
Asset Impairments |  | 49 |
Total Restructuring Charges & Asset Impairments |  | 124 |
Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 32 |
Severance | Government Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 2 |
Severance | Sustainable Technology Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 29 |
Severance | Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 1 |
Lease Abandonment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 58 |
Lease Abandonment | Government Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 0 |
Lease Abandonment | Sustainable Technology Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 4 |
Lease Abandonment | Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 54 |
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 26 |
Other | Government Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 0 |
Other | Sustainable Technology Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | 6 |
Other | Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Restructuring Charges |  | $ 20 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
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