Document and Entity Information - USD ($)

12 Months Ended

Dec. 31, 2019

Feb. 12, 2020

Jun. 28, 2019

Document Type

10-K

Document Annual Report

true

Document Period End Date

Dec. 31, 2019

Document Transition Report

false

Entity File Number

001-07434

Entity Registrant Name

Aflac Incorporated

Entity Incorporation, State or Country Code

GA

Entity Tax Identification Number

58-1167100

Entity Address, Address Line One

1932 Wynnton Road

Entity Address, City or Town

Columbus

Entity Address, State or Province

GA

Entity Address, Postal Zip Code

31999

City Area Code

706

Local Phone Number

323.3431

Entity Well-known Seasoned Issuer

Yes

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Large Accelerated Filer

Entity Small Business

false

Entity Emerging Growth Company

false

Entity Shell Company

false

Entity Public Float

$ 40,396,253,541

Entity Common Stock, Shares Outstanding

722,520,700

Amendment Flag

false

Entity Central Index Key

0000004977

Current Fiscal Year End Date

--12-31

Document Fiscal Period Focus

FY

Document Fiscal Year Focus

2019

Documents Incorporated by Reference

Certain information contained in the Notice and Proxy Statement for the Company’s 2020 Annual Meeting of Shareholders is incorporated by reference into Part III hereof.

NEW YORK STOCK EXCHANGE, INC.

Title of 12(b) Security

Common Stock, $.10 Par Value

Trading Symbol

AFL

Security Exchange Name

NYSE