STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS - Capital and Surplus Based on Statutory Accounting Practices (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Aflac
Statutory Accounting Practices [Line Items]
Capital and surplus, NAIC basis	$ 2,682	$ 2,881
CAIC
Statutory Accounting Practices [Line Items]
Capital and surplus, NAIC basis	375	398
TOIC
Statutory Accounting Practices [Line Items]
Capital and surplus, NAIC basis	51	51
Aflac New York
Statutory Accounting Practices [Line Items]
Capital and surplus, NAIC basis	$ 316	$ 323