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COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Details) - Management Consulting and Technology Services Company Application Maintenance and Development Services - Aflac Japan $ in Millions, ¥ in Billions | 3 Months Ended
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Mar. 31, 2023 JPY (¥) | Mar. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |
Outsourcing agreement, remaining term | 5 years | 5 years
Outsourcing agreement, aggregate remaining cost | ¥ 20.9 | $ 157

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