SHAREHOLDERS' EQUITY - Reconciliation of Number of Shares of Common Stock (Detail) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Common Stock Issued [Roll Forward]
Balance, beginning of period	1,356,763	1,355,398
Exercise of stock options and issuance of restricted shares	1,078	1,294
Balance, end of period	1,357,841	1,356,692
Treasury Stock [Roll Forward]
Balance, beginning of period	806,799	776,919
Share repurchase program	25,744	23,446
Balance, end of period	832,131	799,975
Shares outstanding, end of period	525,710	556,717
Treasury Stock
Treasury Stock [Roll Forward]
Other purchases	407	491
Shares issued to AFL Stock Plan	(537)	(594)
Exercise of stock options	(57)	(99)
Other dispositions	(225)	(188)