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

X
- 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=121599337&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=121599337&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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