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Investments (Equity Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Unrealized Gains (Losses) | $ 562 | $ 2,256
Equity securities | 1,684 | 1,269
Common Stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Cost | 1,347 | 784
Equity Securities, FV-NI, Unrealized Gains (Losses) | 195 | 295
Equity securities | 1,542 | 1,079
Non-redeemable Preferred Stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Cost | 148 | 189
Equity Securities, FV-NI, Unrealized Gains (Losses) | (6) | 1
Equity securities | 142 | 190
Equity Securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Cost | 1,495 | 973
Equity Securities, FV-NI, Unrealized Gains (Losses) | 189 | 296
Equity securities | $ 1,684 | $ 1,269

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