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
	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