POLICY LIABILITIES - Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates (Detail) - Aflac Japan - Fixed Annuity - USD ($) $ in Millions		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
At Guaranteed Minimum	[1]	$ 5,152	$ 5,221	$ 5,939
Cash Surrender Value	[1]	$ 5,083	$ 5,150
Weighted Average Crediting Rate		1.50%	1.50%
Lower Limit
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Guaranteed Minimum Crediting Rates	[1],[2]	0.50%	0.50%
Upper Limit
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Guaranteed Minimum Crediting Rates	[1],[2]	2.20%	2.20%

[1] Aflac Japan fixed annuities

[2] Weighted-average crediting rate of 1.5% at December 31, 2025 and 2024