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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | $ 42 | $ 52 | $ 55 | $ 48 |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 1 | 1 | (12) | 3 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 43 | 54 | 43 | 54 |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 1 | 0 | 1 |
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 | 39 | 49 | 52 | 48 |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 1 | 1 | (12) | 2 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 40 | 51 | 40 | 51 |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 1 | 0 | 1 |
Operating Segments [Member] | Group Benefits |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 1 | 1 | 0 |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0 | 0 | 0 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 1 | 1 | 1 | 1 |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 0 | 0 | 0 |
Corporate, Non-Segment [Member] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 2 | 2 | 2 | 0 |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0 | 0 | 1 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2 | 2 | 2 |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 0 | 0 | 0 |
Uncollectible reinsurance |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 98 | 117 | 108 | 114 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 99 | 111 | 99 | 111 |
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 | 95 | 114 | 105 | 114 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 96 | 108 | 96 | 108 |
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 | 1 | 0 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 1 | 1 | 1 | 1 |
Uncollectible reinsurance | Corporate, Non-Segment [Member] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 2 | 2 | 2 | 0 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2 | 2 | 2 |
Disputes [Member] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 56 | 65 | 53 | 66 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 56 | 57 | 56 | 57 |
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 | 56 | 65 | 53 | 66 |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 56 | 57 | 56 | 57 |
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 |
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 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | $ 2
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Operating Segments [Member] | Group Benefits |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 1
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | $ 1
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance |  |  | 55 | 50 |
Cumulative Effect, Period of Adoption, Adjusted Balance [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 |  |  | 52 | 48 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Operating Segments [Member] | Group Benefits |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance |  |  | 1 | 1 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance |  |  | $ 2 | $ 1 |

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- Definition Amount of increase in allowance for credit loss on reinsurance recoverable, from recovery. + 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 (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + 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 stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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