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INVESTMENTS - Investment Exposures Individually Exceeded 10% of Shareholders' Equity (Detail) - Japan National Government - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Summary of Investment Holdings [Line Items] |  |  |
Credit Rating | [1] | A+ | A+
Amortized Cost | [1] | $ 51,726 | $ 51,207
Fair Value | [1] | $ 62,584 | $ 59,945
[1] | Japan Government Bonds (JGBs) or JGB-backed securities

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