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BUSINESS SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
BUSINESS SEGMENT INFORMATION BUSINESS SEGMENT INFORMATION
The Company consists of two reportable insurance business segments: Aflac Japan and Aflac U.S., both of which sell supplemental health and life insurance. In addition, the Parent Company, other operating business units that are not individually reportable, reinsurance activities, including reinsurance activity of Aflac Re, and other business activities not included in Aflac Japan or Aflac U.S., as well as intercompany eliminations, are included in Corporate and other. The Company does not allocate corporate overhead expenses to business segments.

The Company’s reportable segments are regularly reviewed by the Company's Chief Operating Decision Maker (CODM), Senior Executive Vice President and Chief Financial Officer, in deciding how to allocate resources and in assessing performance. The Company's CODM reviews and approves the annual budget and operating forecast, which allocates resources to segments and serves as a key benchmark for tracking performance and accountability of each segment's operating results. The Company’s CODM evaluates the performance of the segments using, in comparison to the annual budget, operating forecast and historical results, a financial performance measure called pretax adjusted earnings and believes this financial performance measure to be vitally important for understanding the underlying profitability drivers and trends of the Company’s insurance business.
•Pretax adjusted earnings are adjusted revenues less benefits and adjusted expenses. The adjustments to both revenues and expenses account for certain items that are outside management’s control because they tend to be driven by general economic conditions and events or are related to infrequent activities not directly associated with insurance operations. The Company excludes income taxes related to operations to arrive at pretax adjusted earnings.
◦Adjusted revenues are U.S. GAAP total revenues excluding net investment gains and losses, except for amortized hedge costs/income related to foreign currency exposure management strategies and net interest income/expense from derivatives associated with certain investment strategies, which are reclassified from net investment gains (losses) and included in adjusted earnings as a component of adjusted net investment income when analyzing operations. 
◦Adjusted expenses are U.S. GAAP total acquisition and operating expenses including the impact of interest from derivatives associated with notes payable but excluding any non-recurring or other items not associated with the normal course of the Company’s insurance operations and that do not reflect the Company’s underlying business performance.

Aflac Japan's adjusted revenues as a percentage of the Company's total adjusted revenues were 51% and 53% in the three-month periods ended March 31, 2026 and 2025, respectively. The percentage of the Company's total assets attributable to Aflac Japan was 76% at both March 31, 2026 and December 31, 2025.
Information regarding operations by reportable segment and Corporate and other is presented in the following tables.
  
Three Months Ended March 31,
(In millions)20262025
Revenues:
Aflac Japan:
Net earned premiums (1)
$1,573 $1,681 
Adjusted net investment income591 586 
Other income8 5 
Total adjusted revenue Aflac Japan2,172 2,272 
Aflac U.S.:
Net earned premiums1,555 1,502 
Adjusted net investment income201 202 
Other income23 17 
Total adjusted revenue Aflac U.S.1,779 1,721 
Corporate and other (2)
292 326 
Total adjusted revenues4,243 4,319 
Net investment gains (losses)49 (963)
Reconciling items:
Amortized hedge costs15 7 
Amortized hedge income(18)(30)
Net interest (income) expense from derivatives associated
  with certain investment strategies		57 65 
Total revenues$4,346 $3,398 
(1) Includes a gain (loss) of an immaterial amount for the three-month periods ended March 31, 2026 and 2025, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.
(2) The change in value of federal historic rehabilitation and solar investments in partnerships of $5 and $8 for the three-month periods ended March 31, 2026 and 2025, respectively, is included as a reduction to net investment income. Tax credits on these investments of $5 and $7 for the three-month periods ended March 31, 2026 and 2025, respectively, have been reported as an income tax benefit in the consolidated statements of earnings. See Note 1 of the Notes to the Consolidated Financial Statements in the 2025 Annual Report for additional information on these investments.
  Three Months Ended March 31,
(In millions)20262025
Adjusted revenues:
Aflac Japan (1)
$2,172 $2,272 
Aflac U.S.1,779 1,721 
Corporate and other (2)
292 326 
Total adjusted revenues4,243 4,319 
Benefits and adjusted expenses:
Aflac Japan:
Benefits and claims, excluding reserve remeasurement1,035 1,130 
Reserve remeasurement (gains) losses(45)(25)
Total benefits and claims, net990 1,105 
Adjusted expenses:
Amortization of deferred policy acquisition costs78 79 
Insurance commissions95 105 
Insurance and other expenses250 261 
Total benefits and adjusted expenses Aflac Japan1,413 1,550 
Aflac U.S.:
Benefits and claims, excluding reserve remeasurement770 731 
Reserve remeasurement (gains) losses(36)(15)
Total benefits and claims, net734 716 
Adjusted expenses:
Amortization of deferred policy acquisition costs143 137 
Insurance commissions142 135 
Insurance and other expenses397 375 
Total benefits and adjusted expenses Aflac U.S.1,416 1,363 
Corporate and other292 283 
Total adjusted expenses$3,121 $3,196 
Pretax earnings:
Aflac Japan (1)
$759 $722 
Aflac U.S. 363 358 
Corporate and other (2)
0 43 
Pretax adjusted earnings1,122 1,123 
Other income (loss)0 (53)
Net investment gains (losses)49 (963)
Reconciling items:
Amortized hedge costs15 7 
Amortized hedge income(18)(30)
Net interest (income) expense from derivatives associated
  with certain investment strategies		57 65 
Impact of interest from derivatives associated with notes payable0 (4)
Total earnings before income taxes$1,225 $145 
Income taxes applicable to pretax adjusted earnings$221 $217 
Effect of foreign currency translation on after-tax adjusted earnings(8)(8)
(1) Includes a gain (loss) of an immaterial amount for the three-month periods ended March 31, 2026 and 2025, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.
(2) The change in value of federal historic rehabilitation and solar investments in partnerships of $5 and $8 for the three-month periods ended March 31, 2026, and 2025, respectively, is included as a reduction to net investment income. Tax credits on these investments of $5 and $7 for the three-month periods ended March 31, 2026, and 2025, respectively, have been reported as an income tax benefit in the consolidated statements of earnings. See Note 1 of the Notes to the Consolidated Financial Statements in the 2025 Annual Report for additional information on these investments.
Internal Reinsurance: Aflac Re is a Bermuda-domiciled insurer that reinsures certain policies issued by Aflac Japan as well as external parties and is reported as part of Corporate and other. Under the internal reinsurance transactions, Aflac Japan's net earned premiums are reduced by the amount of premiums ceded to Aflac Re. Aflac Re recorded net earned premiums of $158 million and $178 million for the three-month periods ended March 31, 2026 and 2025, respectively, related to these reinsurance transactions with Aflac Japan. These internal reinsurance transactions have no financial statement impact on a consolidated basis, except for the effect of foreign currency accounting. For additional information on these internal reinsurance transactions, see the accompanying Note 8 and Note 8 of the Notes to the Consolidated Financial Statements in the 2025 Annual Report.

Total Assets: The Company's total assets were as follows:
(In millions)March 31,
2026		December 31,
2025
Assets:
Aflac Japan$88,446 $88,537 
Aflac U.S.22,587 22,317 
Corporate and other5,247 5,616 
    Total assets$116,280 $116,470