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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | $ 43,055 | $ 40,626
Corporate bonds and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 25,792 | 24,268
States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 7,148 | 7,392
Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 8,628 | 7,901
Fair Value, Recurring |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 42,527 | 40,425
Fixed maturities trading | 528 | 201
Total fixed maturities | 43,055 | 40,626
Equity securities | 1,215 | 1,050
Short-term and other | 5,073 | 4,247
Receivables | 6 | 13
Payable to brokers | (57) | (62)
Fair Value, Recurring | Corporate bonds and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 26,751 | 25,132
Fair Value, Recurring | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 7,148 | 7,392
Fair Value, Recurring | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 8,628 | 7,901
Level 1 | Fair Value, Recurring |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 225 | 161
Fixed maturities trading | 528 | 201
Total fixed maturities | 753 | 362
Equity securities | 765 | 586
Short-term and other | 5,043 | 4,215
Receivables |  |
Payable to brokers | (57) | (62)
Level 1 | Fair Value, Recurring | Corporate bonds and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 225 | 161
Level 1 | Fair Value, Recurring | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale |  |
Level 1 | Fair Value, Recurring | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale |  |
Level 2 | Fair Value, Recurring |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 40,105 | 38,274
Fixed maturities trading |  |
Total fixed maturities | 40,105 | 38,274
Equity securities | 436 | 440
Short-term and other | 30 | 32
Receivables | 6 | 13
Payable to brokers |  |
Level 2 | Fair Value, Recurring | Corporate bonds and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 25,289 | 23,926
Level 2 | Fair Value, Recurring | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 7,103 | 7,348
Level 2 | Fair Value, Recurring | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 7,713 | 7,000
Level 3 | Fair Value, Recurring |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 2,197 | 1,990
Fixed maturities trading |  |
Total fixed maturities | 2,197 | 1,990
Equity securities | 14 | 24
Short-term and other |  |
Receivables |  |
Payable to brokers |  |
Level 3 | Fair Value, Recurring | Corporate bonds and other |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 1,237 | 1,045
Level 3 | Fair Value, Recurring | States, municipalities and political subdivisions |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | 45 | 44
Level 3 | Fair Value, Recurring | Asset-backed |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Fixed maturities available-for-sale | $ 915 | $ 901

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