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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Segment Reconciling Items | Catastrophe |  |
Prior accident year development [1] | $ (32) | $ (98)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (143) | (113)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items | COVID-19 related Claims |  |
Prior accident year development [1] | 14 |
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | 27 | 26
General Liability [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | 33 | 451
Marine | Segment Reconciling Items |  |
Prior accident year development [1] | 2 | 0
Package Business [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (35) | (66)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items |  |
Prior accident year development [1] | (17) | (24)
Property Insurance [Member] | Personal Lines | Segment Reconciling Items |  |
Prior accident year development [1] | (2) | 2
Professional Liability Insurance [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (9) | (7)
Surety Product Line [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (4) | (26)
Assumed reinsurance | Segment Reconciling Items |  |
Prior accident year development [1] | 12 | 0
Automobiles [Member] | Commercial Lines | Segment Reconciling Items |  |
Prior accident year development [1] | 23 | 9
Automobiles [Member] | Personal Lines | Segment Reconciling Items |  |
Prior accident year development [1] | (14) | (73)
Uncollectible reinsurance | Segment Reconciling Items |  |
Prior accident year development [1] | 3 | (10)
Insurance, Other [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | 9 | 26
Property, Liability and Casualty Insurance Product Line |  |
Prior accident year development [1] | (147) | 170
Prior accident year development before change in deferred gain | (147) | 97
Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |
Increase (Decrease) in Deferred Revenue | $ 0 | $ 73

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- Definition Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit + References No definition available. + Details
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- Definition Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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