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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | $ 55 | $ 48 |  |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | (13) | 2 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 42 | 52 |  |
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 |  |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | (13) | 1 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 39 | 49 |  |
Operating Segments [Member] | Group Benefits |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 0 |  |
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 | 0 |  |
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 1 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 2 | 2 |  |
Uncollectible reinsurance |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 108 | 114 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 98 | 117 |  |
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 | 105 | 114 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 95 | 114 |  |
Uncollectible reinsurance | Operating Segments [Member] | Group Benefits |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 | 0 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 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 | 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 | 53 | 66 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 56 | 65 |  |
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 | 53 | 66 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance | 56 | 65 |  |
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 |  |
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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