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INVESTMENTS - Investment Exposures Individually Exceeded 10% of Shareholders' Equity (Details) - Japan National Government - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Summary of Investment Holdings [Line Items] |  |  |
Credit Rating | [1] | A+ | A+
Amortized Cost | [1] | $ 51,953 | $ 55,153
Fair Value | [1] | $ 60,106 | $ 64,657
[1] | Japan Government Bonds (JGBs) or JGB-backed securities

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