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Fair Value Measurements - Net Realized and Unrealized Gains and Losses Included in Income Related to Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | $ 21 | $ (9) | $ 20 | $ 19
Net realized gains (losses), liabilities | $ 8 | $ (43) | $ 39 | $ 83
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Adjusted Revenues | Adjusted Revenues | Adjusted Revenues | Adjusted Revenues
Derivative liabilities, net |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | $ (12) | $ 29 | $ 40 | $ 15
Fortitude Re funds withheld payable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | (8) | (58) | 1 | 82
Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | 28 | (14) | (2) | (14)
Bonds available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | 23 | (11) | 32 | 21
Other bond securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | 2 | (1) | 1 | 3
Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | 0 | 2 | 0 | 2
Other invested assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | $ (4) | $ 1 | $ (13) | $ (7)
Net Investment Income |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Investment Income | Net Investment Income | Net Investment Income | Net Investment Income
Net Investment Income | Derivative liabilities, net |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | $ 0 | $ 0 | $ 0 | $ 0
Net Investment Income | Fortitude Re funds withheld payable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | 0 | 0 | 0 | 0
Net Investment Income | Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | 0 | 0 | 0 | 0
Net Investment Income | Bonds available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | 25 | 4 | 40 | 37
Net Investment Income | Other bond securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | 2 | (1) | 1 | 3
Net Investment Income | Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets |  | 2 |  | 2
Net Investment Income | Other invested assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | (4) | 1 | (13) | (7)
Net Realized Gains (Losses) | Derivative liabilities, net |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | (12) | 29 | 40 | 15
Net Realized Gains (Losses) | Fortitude Re funds withheld payable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | (8) | (58) | 1 | 82
Net Realized Gains (Losses) | Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), liabilities | 28 | (14) | (2) | (14)
Net Realized Gains (Losses) | Bonds available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | (2) | (15) | (8) | (16)
Net Realized Gains (Losses) | Other bond securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | 0 | 0 | 0 | 0
Net Realized Gains (Losses) | Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets |  | 0 |  | 0
Net Realized Gains (Losses) | Other invested assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net realized gains (losses), assets | $ 0 | $ 0 | $ 0 | $ 0

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