STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS - Net Income (Loss) Based on Statutory Accounting Practices (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Aflac
Statutory Accounting Practices [Line Items]
Net income (loss), statutory accounting practices	$ 912	$ 1,106	$ 1,134
CAIC
Statutory Accounting Practices [Line Items]
Net income (loss), statutory accounting practices	(94)	(121)	(69)
TOIC
Statutory Accounting Practices [Line Items]
Net income (loss), statutory accounting practices	(20)	(27)	(35)
Aflac New York
Statutory Accounting Practices [Line Items]
Net income (loss), statutory accounting practices	$ 46	$ 54	$ 67