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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, 2023 | Sep. 30, 2022
Segment Reconciling Items | Asbestos and Environmental |  |
Prior accident year development | $ 0 | $ 0
Segment Reconciling Items | Catastrophe |  |
Prior accident year development | (44) | (32)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items |  |
Prior accident year development | (174) | (143)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items | COVID-19 related Claims |  |
Prior accident year development | 38 | 14
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items |  |
Prior accident year development | 32 | 27
General Liability [Member] | Segment Reconciling Items |  |
Prior accident year development | 39 | 33
Marine | Segment Reconciling Items |  |
Prior accident year development | (1) | 2
Package Business [Member] | Segment Reconciling Items |  |
Prior accident year development | (18) | (35)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items |  |
Prior accident year development | 2 | (17)
Property Insurance [Member] | Personal Lines | Segment Reconciling Items |  |
Prior accident year development | 1 | (2)
Professional Liability Insurance [Member] | Segment Reconciling Items |  |
Prior accident year development | (3) | (9)
Surety Product Line [Member] | Segment Reconciling Items |  |
Prior accident year development | 12 | (4)
Assumed reinsurance | Segment Reconciling Items |  |
Prior accident year development | 19 | 12
Automobiles [Member] | Commercial Lines | Segment Reconciling Items |  |
Prior accident year development | 6 | 23
Automobiles [Member] | Personal Lines | Segment Reconciling Items |  |
Prior accident year development | 0 | (14)
Uncollectible reinsurance | Segment Reconciling Items |  |
Prior accident year development | 13 | 3
Insurance, Other [Member] | Segment Reconciling Items |  |
Prior accident year development | 34 | 9
Property, Liability and Casualty Insurance Product Line |  |
Prior accident year development | $ (82) | $ (147)

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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 -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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