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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | $ 105 | $ 99 | $ 99 | $ 108
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 1 | 1 | 0 | (11)
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 105 | 99 | 105 | 99
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 102 | 96 | 96 | 105
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 1 | 1 | 0 | (11)
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 102 | 96 | 102 | 96
Operating Segments [Member] | Group Benefits |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 1 | 1 | 1
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0 | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 1 | 1 | 1 | 1
Corporate, Non-Segment [Member] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 2 | 2 | 2 | 2
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0 | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2 | 2 | 2
Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 44 | 43 | 45 | 55
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 45 | 44 | 45 | 44
Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 41 | 40 | 42 | 52
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 42 | 41 | 42 | 41
Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] | Operating Segments [Member] | Group Benefits |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 1 | 1 | 1
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 1 | 1 | 1 | 1
Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] | Corporate, Non-Segment [Member] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 2 | 2 | 2 | 2
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2 | 2 | 2
Reinsurance Contract [Axis]: Disputes [Member] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 61 | 56 | 54 | 53
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 60 | 55 | 60 | 55
Reinsurance Contract [Axis]: Disputes [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 61 | 56 | 54 | 53
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 60 | 55 | 60 | 55
Reinsurance Contract [Axis]: Disputes [Member] | Operating Segments [Member] | Group Benefits |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 0 | 0 | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 0 | 0 | 0 | 0
Reinsurance Contract [Axis]: Disputes [Member] | Corporate, Non-Segment [Member] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 0 | 0 | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | $ 0 | $ 0 | $ 0 | $ 0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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