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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance |  |  | $ 105 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | $ 110 | $ 105 | 110 | $ 105
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 | 102 | 96
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 1 | 1 | 3 | (1)
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 107 | 102 | 107 | 102
Operating Segments [Member] | Group Benefits |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance |  |  | 1 |
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 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2 | 2 | 2
Reinsurance Contract [Axis]: Before Disputed Amounts [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 | 44 | 40 | 42 | 42
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 45 | 41 | 45 | 41
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 | 58 | 56 | 60 | 54
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | $ 62 | $ 61 | $ 62 | $ 61

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + 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 -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479616/944-310-45-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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