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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Goodwill by segment
Goodwill	$ 3,922	$ 4,008
Reportable Segments [Member] \| Business Insurance [Member]
Goodwill by segment
Goodwill	2,538	2,610
Reportable Segments [Member] \| Bond & Specialty Insurance [Member]
Goodwill by segment
Goodwill	550	550
Reportable Segments [Member] \| Personal Insurance [Member]
Goodwill by segment
Goodwill	808	822
Other [Member]
Goodwill by segment
Goodwill	$ 26	$ 26

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.

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