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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 | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2016 | Dec. 31, 2023
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 185 |  |  | $ 209
Reinsurance Contract [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  | $ 1,700 |
Change in Deferred Gain on Retroactive Reinsurance | 788 |  |  |
Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Increase (Decrease) in Deferred Revenue | (24) | $ 0 |  |
Segment Reconciling Items | Asbestos and Environmental |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | 0 |  |
Segment Reconciling Items | Catastrophe |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | 0 |  |
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | (67) | (61) |  |
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items | COVID-19 related Claims |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 20 | 20 |  |
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 12 | 11 |  |
General Liability [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 17 | 12 |  |
Marine | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 7 | 1 |  |
Package Business [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | (5) |  |
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | (3) | 5 |  |
Property Insurance [Member] | Personal Lines | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | (1) |  |
Professional Liability Insurance [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | (5) | 0 |  |
Surety Product Line [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | 0 |  |
Assumed reinsurance | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 9 | 2 |  |
Automobiles [Member] | Commercial Lines | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | 0 |  |
Automobiles [Member] | Personal Lines | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | 0 |  |
Uncollectible reinsurance | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | 0 | 8 |  |
Insurance, Other [Member] | Segment Reconciling Items |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | (2) | 28 |  |
Property, Liability and Casualty Insurance Product Line |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Prior accident year development [1] | (56) | 0 |  |
Prior accident year development before change in deferred gain | (32) | 0 |  |
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 | $ (24) | $ 0 |  |

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