Investments - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
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| Investments, Fair Value Disclosure [Abstract] | |||||
| Gross unrealized gain included in accumulated other comprehensive gain/(loss) | $ 179,000,000 | $ 626,000,000 | |||
| Net unrealized losses included in other comprehensive income/(loss before tax | $ (117,000,000) | $ 370,000,000 | (1,130,000,000) | $ 928,000,000 | |
| Net unrealized losses included in other comprehensive income/(loss) after tax | (94,000,000) | 273,000,000 | (847,000,000) | 693,000,000 | |
| Debt securities, available-for-sale, realized gain (loss) | $ 0 | $ 0 | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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