Insider Trading Arrangements	3 Months Ended	12 Months Ended
Dec. 31, 2025 shares	Dec. 31, 2025 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		Insider Trading Arrangements During the fourth quarter of 2025, the following directors or executive officers adopted or terminated a contract, instruction or written plan for the purchase or sale of the Parent Company's securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a non-Rule 10b5-1 trading arrangement as defined in Regulation S-K Item 408(c): •On December 1, 2025, Miwako Hosoda, a member of the Company's board of directors, adopted a Rule 10b5-1 trading plan that provides for the sale of 20% of time-based restricted stock shares to be released 1 year after the original grant date. The plan will terminate no later than May 29, 2026. The estimated number of gross shares of Aflac Incorporated common stock to be released is 1,722; however, the actual number of shares released may vary based on dividends accrued prior to the release date. •On December 4, 2025, Joseph L. Moskowitz, a member of the Company's board of directors, adopted a Rule 10b5-1 trading plan that provides for the sale of 2,400 shares of Aflac Incorporated common stock. The plan will terminate no later than November 13, 2026. •On December 5, 2025, Masatoshi Koide, President and Representative Director of Aflac Japan, adopted a Rule 10b5-1 trading plan that provides for the sale of 50% of performance-based restricted stock shares to be released upon approval of the Company's board of directors and at least 3 years after the original grant date. The plan will terminate no later than June 30, 2026. The estimated number of gross shares of Aflac Incorporated common stock to be released is 18,605; however, the actual number of shares released may vary based on achievement of designated performance metrics. •On December 8, 2025, Charles D. Lake II, Chairman and Representative Director of Aflac Japan and President of Aflac International, adopted a Rule 10b5-1 trading plan that provides for the sale of 55.95% of performance-based restricted stock shares to be released upon approval of the Company's board of directors and at least 3 years after the original grant date. The plan will terminate no later than June 30, 2026. The estimated number of gross shares of Aflac Incorporated common stock to be released is 16,116; however, the actual number of shares released may vary based on achievement of designated performance metrics.
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Miwako Hosoda [Member]
Trading Arrangements, by Individual
Name	Miwako Hosoda
Title	member of the Company's board of directors
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 1, 2025
Expiration Date	May 29, 2026
Aggregate Available	1,722	1,722
Joseph L. Moskowitz [Member]
Trading Arrangements, by Individual
Name	Joseph L. Moskowitz
Title	member of the Company's board of directors
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 4, 2025
Expiration Date	November 13, 2026
Aggregate Available	2,400	2,400
Masatoshi Koide [Member]
Trading Arrangements, by Individual
Name	Masatoshi Koide
Title	President and Representative Director of Aflac Japan
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 5, 2025
Expiration Date	June 30, 2026
Aggregate Available	18,605	18,605
Charles D. Lake II [Member]
Trading Arrangements, by Individual
Name	Charles D. Lake II
Title	Chairman and Representative Director of Aflac Japan and President of Aflac International
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 8, 2025
Expiration Date	June 30, 2026
Aggregate Available	16,116	16,116

Insider Trading Arrangements

3 Months Ended

12 Months Ended

Dec. 31, 2025

Insider Trading Arrangements

During the fourth quarter of 2025, the following directors or executive officers adopted or terminated a contract, instruction or written plan for the purchase or sale of the Parent Company's securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a non-Rule 10b5-1 trading arrangement as defined in Regulation S-K Item 408(c):

•On December 1, 2025, Miwako Hosoda, a member of the Company's board of directors, adopted a Rule 10b5-1 trading plan that provides for the sale of 20% of time-based restricted stock shares to be released 1 year after the original grant date. The plan will terminate no later than May 29, 2026. The estimated number of gross shares of Aflac Incorporated common stock to be released is 1,722; however, the actual number of shares released may vary based on dividends accrued prior to the release date.

•On December 4, 2025, Joseph L. Moskowitz, a member of the Company's board of directors, adopted a Rule 10b5-1 trading plan that provides for the sale of 2,400 shares of Aflac Incorporated common stock. The plan will terminate no later than November 13, 2026.

•On December 5, 2025, Masatoshi Koide, President and Representative Director of Aflac Japan, adopted a Rule 10b5-1 trading plan that provides for the sale of 50% of performance-based restricted stock shares to be released upon approval of the Company's board of directors and at least 3 years after the original grant date. The plan will terminate no later than June 30, 2026. The estimated number of gross shares of Aflac Incorporated common stock to be released is 18,605; however, the actual number of shares released may vary based on achievement of designated performance metrics.

•On December 8, 2025, Charles D. Lake II, Chairman and Representative Director of Aflac Japan and President of Aflac International, adopted a Rule 10b5-1 trading plan that provides for the sale of 55.95% of performance-based restricted stock shares to be released upon approval of the Company's board of directors and at least 3 years after the original grant date. The plan will terminate no later than June 30, 2026. The estimated number of gross shares of Aflac Incorporated common stock to be released is 16,116; however, the actual number of shares released may vary based on achievement of designated performance metrics.

Non-Rule 10b5-1 Arrangement Adopted

false

Rule 10b5-1 Arrangement Terminated

false

Non-Rule 10b5-1 Arrangement Terminated

false

Miwako Hosoda [Member]

Trading Arrangements, by Individual

Name

Miwako Hosoda

Title

member of the Company's board of directors