Investments (Equity Securities) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Debt and Equity Securities, FV-NI [Line Items] | ||
| Equity Securities, FV-NI, Unrealized Gains (Losses) | $ 3,539 | $ 3,274 |
| Equity securities | 932 | 858 |
| Common Stock | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Equity Securities, FV-NI, Cost | 569 | 498 |
| Equity Securities, FV-NI, Unrealized Gains (Losses) | 253 | 246 |
| Equity securities | 822 | 744 |
| Non-redeemable preferred Stock | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Equity Securities, FV-NI, Cost | 103 | 106 |
| Equity Securities, FV-NI, Unrealized Gains (Losses) | 7 | 8 |
| Equity securities | 110 | 114 |
| Equity Securities | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Equity Securities, FV-NI, Cost | 672 | 604 |
| Equity Securities, FV-NI, Unrealized Gains (Losses) | 260 | 254 |
| Equity securities | $ 932 | $ 858 |
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- Definition Equity and Trading Securities, FV-NI, Unrealized Gains (Losses) No definition available.
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- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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