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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | $ 99 | $ 108
Reinsurance Recoverable, Credit Loss Expense (Reversal) | (2) | (13)
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 99 | 98
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 | 96 | 105
Reinsurance Recoverable, Credit Loss Expense (Reversal) | (2) | (13)
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 96 | 95
Operating Segments [Member] | Group Benefits |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 1
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 1 | 1
Corporate, Non-Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 2 | 2
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2
Disputes [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 54 | 53
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 56 | 56
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 | 54 | 53
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 56 | 56
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
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 0 | 0
Disputes [Member] | Corporate, Non-Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 0 | 0
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 0 | 0
Before Uncollectible Reinsurance |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 45 | 55
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 43 | 42
Before Uncollectible Reinsurance | 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 | 42 | 52
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 40 | 39
Before Uncollectible Reinsurance | Operating Segments [Member] | Group Benefits |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 1
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 1 | 1
Before Uncollectible Reinsurance | Corporate, Non-Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 2 | 2
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | $ 2 | $ 2

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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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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