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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 | 28 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021
Adverse Development Cover Navigators Group [Member] |  |  |
Prior accident year development [1] |  |  | $ 382
Increase (Decrease) in Deferred Revenue | $ 73 | $ 97 |
Segment Reconciling Items | Catastrophe |  |  |
Prior accident year development [1] | (98) | (413) |
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | (113) | (72) |
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | 26 | 27 |
General Liability [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | 451 | 112 |
Marine | Segment Reconciling Items |  |  |
Prior accident year development [1] | 0 | 1 |
Package Business [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | (66) | (24) |
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items |  |  |
Prior accident year development [1] | (24) | (6) |
Property Insurance [Member] | Personal Lines | Segment Reconciling Items |  |  |
Prior accident year development [1] | 2 | 3 |
Professional Liability Insurance [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | (7) | (16) |
Surety Product Line [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | (26) | (10) |
Assumed reinsurance | Segment Reconciling Items |  |  |
Prior accident year development [1] | 0 | (7) |
Automobiles [Member] | Commercial Lines | Segment Reconciling Items |  |  |
Prior accident year development [1] | 9 | 27 |
Automobiles [Member] | Personal Lines | Segment Reconciling Items |  |  |
Prior accident year development [1] | (73) | (53) |
Uncollectible reinsurance | Segment Reconciling Items |  |  |
Prior accident year development [1] | (10) | (8) |
Insurance, Other [Member] | Segment Reconciling Items |  |  |
Prior accident year development [1] | 26 | 22 |
Property, Liability and Casualty Insurance Product Line |  |  |
Prior accident year development [1] | 170 | (320) |
Prior accident year development before change in deferred gain | 97 | (417) |
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member] |  |  |
Increase (Decrease) in Deferred Revenue | $ 73 | $ 97 |

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