INVESTMENTS - Investment Exposures Individually Exceeding 10% of Shareholders' Equity (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
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Mar. 31, 2026 |
Dec. 31, 2025 |
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| Investments [Abstract] | ||||
| Credit Rating | [1] | A+ | A+ | |
| Amortized Cost | [1] | $ 31,756 | $ 32,618 | |
| Fair Value | [1] | $ 26,885 | $ 28,434 | |
| Investment, Type [Extensible Enumeration] | Japan National Government [Member] | Japan National Government [Member] | ||
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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and 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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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity) and 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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- Definition Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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