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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Amortization of Deferred Gain on Retroactive Reinsurance | $ 26 | $ 87 |
Property, Liability and Casualty Insurance Product Line |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (221) | $ (82)
Prior accident year development before change in deferred gain |  | (134) | (82)
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 |  | (87) | 0
Segment Reconciling Items |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Increase (Decrease) in Deferred Revenue |  | (87) | 0
Segment Reconciling Items | Catastrophe |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (38) | (44)
Segment Reconciling Items | Asbestos and Environmental |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 0 | 0
Segment Reconciling Items | Accident and Health Insurance Product Line [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (188) | (174)
Segment Reconciling Items | Accident and Health Insurance Product Line [Member] | COVID-19 related Claims |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 48 | 38
Segment Reconciling Items | Change in Workers Compensation Discount Including Accretion [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 34 | 32
Segment Reconciling Items | General Liability [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 81 | 39
Segment Reconciling Items | Marine |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (1) | (1)
Segment Reconciling Items | Package Business [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (6) | (18)
Segment Reconciling Items | Property Insurance [Member] | Commercial Lines |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (7) | 2
Segment Reconciling Items | Property Insurance [Member] | Personal Lines |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (15) | 1
Segment Reconciling Items | Professional Liability Insurance [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (7) | (3)
Segment Reconciling Items | Surety Product Line [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (22) | 12
Segment Reconciling Items | Assumed reinsurance |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 24 | 19
Segment Reconciling Items | Automobiles [Member] | Commercial Lines |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 26 | 6
Segment Reconciling Items | Automobiles [Member] | Personal Lines |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | (13) | 0
Segment Reconciling Items | Uncollectible reinsurance |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | 0 | 13
Segment Reconciling Items | Insurance, Other [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Prior accident year development [1] |  | $ (2) | $ 34

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