INVESTMENTS - Investment Exposures Individually Exceeding 10% of Shareholders' Equity (Details) - Japan government and agencies - Japan National Government - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended | ||
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Sep. 30, 2026 |
Dec. 31, 2025 |
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| Investment Exposures Individually Exceeding 10 Percent of Shareholders' Equity [Line Items] | ||||
| Credit Rating | [1] | A+ | A+ | |
| Amortized Cost | [1] | $ 31,351 | $ 32,618 | |
| Fair Value | [1] | $ 26,334 | $ 28,434 | |
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- Definition Investment Exposures Individually Exceeding 10 Percent of Shareholders' Equity [Line Items] No definition available.
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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://www.xbrl.org/2009/role/commonPracticeRef
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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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