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Goodwill & Other Intangible Assets - Goodwill Carrying Value (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |
Beginning balance | $ 1,911,000,000 | $ 1,913,000,000 |
Goodwill, Purchase Accounting Adjustments | 0 | (2,000,000) |
Ending balance | 1,911,000,000 | 1,911,000,000 | $ 1,913,000,000
Goodwill, Impairment Loss | 0 | 0 | 0
Operating Segments | P&C Commercial Lines |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 659,000,000 | 661,000,000 |
Goodwill, Purchase Accounting Adjustments | 0 | (2,000,000) |
Ending balance | 659,000,000 | 659,000,000 | 661,000,000
Operating Segments | P&C Personal Lines |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 119,000,000 | 119,000,000 |
Goodwill, Purchase Accounting Adjustments | 0 | 0 |
Ending balance | 119,000,000 | 119,000,000 | 119,000,000
Operating Segments | Hartford Funds |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 180,000,000 | 180,000,000 |
Goodwill, Purchase Accounting Adjustments | 0 | 0 |
Ending balance | 180,000,000 | 180,000,000 | 180,000,000
Operating Segments | Group Benefits [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 723,000,000 | 723,000,000 |
Goodwill, Purchase Accounting Adjustments | 0 | 0 |
Ending balance | 723,000,000 | 723,000,000 | 723,000,000
Corporate |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 230,000,000 | 230,000,000 |
Goodwill, Purchase Accounting Adjustments | 0 | 0 |
Ending balance | 230,000,000 | 230,000,000 | 230,000,000
Corporate | Hartford Funds |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 92,000,000 | 92,000,000 |
Ending balance | 92,000,000 | 92,000,000 | 92,000,000
Corporate | Group Benefits [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 138,000,000 | 138,000,000 |
Ending balance | $ 138,000,000 | $ 138,000,000 | $ 138,000,000

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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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: 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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