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Investments (Equity Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Unrealized Gains (Losses) | $ 2,018 | $ 1,589
Equity securities | 750 | 757
Common Stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Cost | 411 | 424
Equity Securities, FV-NI, Unrealized Gains (Losses) | 266 | 239
Equity securities | 677 | 663
Non-redeemable preferred Stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Cost | 73 | 90
Equity Securities, FV-NI, Unrealized Gains (Losses) | 0 | 4
Equity securities | 73 | 94
Equity Securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Cost | 484 | 514
Equity Securities, FV-NI, Unrealized Gains (Losses) | 266 | 243
Equity securities | $ 750 | $ 757

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