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Goodwill (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |
Goodwill | $ 1,519 | $ 1,528
Foreign currency translation | (9) |
Gross goodwill | 4,406 |
Accumulated impairment | (2,887) |
Commercial Industries: |  |
Goodwill [Line Items] |  |
Goodwill | 833 | 837
Foreign currency translation | (4) |
Gross goodwill | 2,386 |
Accumulated impairment | (1,553) |
Government Services: |  |
Goodwill [Line Items] |  |
Goodwill | 620 | 623
Foreign currency translation | (3) |
Gross goodwill | 1,374 |
Accumulated impairment | (754) |
Transportation: |  |
Goodwill [Line Items] |  |
Goodwill | 66 | $ 68
Foreign currency translation | (2) |
Gross goodwill | 646 |
Accumulated impairment | $ (580) |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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