POLICY LIABILITIES - Schedule of Changes in Other Policyholders' Funds (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2024	Dec. 31, 2023
Policyholder Account Balance [Line Items]
Other deposit type reserves		$ 259	$ 230
Total		5,439	6,169
Aflac Japan | Fixed Annuity
Policyholder Account Balance [Line Items]
Beginning balance	[1]	5,939	6,423
Premiums received	[1]	51	126
Transfers from WAYS conversions	[1]	116	229
Surrenders and withdrawals	[1]	(31)	(59)
Benefit payments	[1]	(208)	(419)
Interest credited	[1]	24	53
Foreign currency translation and other	[1]	(711)	(414)
Ending balance	[1]	$ 5,180	$ 5,939

[1] Aflac Japan fixed annuities