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Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments excluded from fair value hierarchy, net asset value practical expedient | $ 715 |  | $ 622 |  |  |
Carrying value | 4,983 |  | 5,030 |  |  |
RUFC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |  |  |  |  |
Carrying value | $ 333 | $ 309 | $ 317 | $ 354 | $ 296 | $ 304

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