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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Increase (Decrease) in Deferred Revenue | $ 32 | $ (24)
Amortization of Deferred Gain on Retroactive Reinsurance | 32 | 24
Property, Liability and Casualty Insurance Product Line |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | (122) | (56)
Prior accident year development before change in deferred gain | (90) | (32)
Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Increase (Decrease) in Deferred Revenue | (32) | (24)
Segment Reconciling Items |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Increase (Decrease) in Deferred Revenue | (32) | (24)
Segment Reconciling Items | Catastrophe |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 0
Segment Reconciling Items | Asbestos and Environmental |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 0
Segment Reconciling Items | Workers' Compensation |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | (65) | (67)
Segment Reconciling Items | Workers' Compensation | COVID-19 related Claims |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] |  | (20)
Segment Reconciling Items | Change in Workers Compensation Discount Including Accretion [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 12 | 12
Segment Reconciling Items | General Liability [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 17
Segment Reconciling Items | Marine |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 7
Segment Reconciling Items | Package Business [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 0
Segment Reconciling Items | Property Insurance [Member] | P&C Business Insurance |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | (3) | (3)
Segment Reconciling Items | Property Insurance [Member] | P&C Personal Insurance |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | (18) | 0
Segment Reconciling Items | Professional Liability Insurance [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | (5)
Segment Reconciling Items | Surety Product Line [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 0
Segment Reconciling Items | Assumed reinsurance |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 9
Segment Reconciling Items | Automobiles [Member] | P&C Business Insurance |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 0
Segment Reconciling Items | Automobiles [Member] | P&C Personal Insurance |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | (12) | 0
Segment Reconciling Items | Uncollectible reinsurance |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | 0 | 0
Segment Reconciling Items | Insurance, Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Prior accident year development [1] | $ (4) | $ (2)

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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/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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