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BUSINESS SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2025
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 internal reinsurance activity with 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 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 53% and 55% in the three-month periods and 53% and 56% in the nine-month periods ended September 30, 2025 and 2024, respectively. The percentage of the Company's total assets attributable to Aflac Japan was 77% at both September 30, 2025 and December 31, 2024.
Information regarding operations by reportable segment and Corporate and other is presented in the following tables.
  
Three Months Ended September 30,Nine Months Ended September 30,
(In millions)2025202420252024
Revenues:
Aflac Japan:
Net earned premiums (1)
$1,663 $1,709 $5,105 $5,241 
Adjusted net investment income665 662 1,950 2,036 
Other income7 7 24 20 
Total adjusted revenue Aflac Japan2,335 2,378 7,079 7,297 
Aflac U.S.:
Net earned premiums1,495 1,459 4,501 4,388 
Adjusted net investment income214 210 623 634 
Other income19 15 53 46 
Total adjusted revenue Aflac U.S.1,728 1,684 5,177 5,068 
Corporate and other (2)
343 225 1,005 723 
Total adjusted revenues4,406 4,287 13,261 13,088 
Net investment gains (losses)275 (1,408)(1,109)239 
Reconciling items:
Amortized hedge costs13 7 31 19 
Amortized hedge income(20)(25)(80)(87)
Net interest (income) expense from derivatives associated
  with certain investment strategies		66 88 195 265 
Total revenues$4,740 $2,949 $12,298 $13,524 
(1) Includes a gain (loss) of $(55) and $(75) for the three-month periods and $(55) and $(80) for the nine-month periods ended September 30, 2025 and 2024, 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 $6 and $57 for the three-month periods and $22 and $119 for the nine-month periods ended September 30, 2025, and 2024, respectively, is included as a reduction to net investment income. Tax credits on these investments of $7 and $78 for the three-month periods and $24 and $142 for the nine-month periods ended September 30, 2025, and 2024, respectively, have been recorded as an income tax benefit in the consolidated statements of earnings. See Note 3 for additional information on these investments.
  Three Months Ended September 30,Nine Months Ended September 30,
(In millions)2025202420252024
Adjusted revenues:
Aflac Japan (1)
$2,335 $2,378 $7,079 $7,297 
Aflac U.S.1,728 1,684 5,177 5,068 
Corporate and other (2)
343 225 1,005 723 
Total adjusted revenues4,406 4,287 13,261 13,088 
Benefits and adjusted expenses:
Aflac Japan:
Benefits and claims, excluding reserve remeasurement1,130 1,197 3,446 3,614 
Reserve remeasurement (gains) losses(474)(369)(513)(421)
Total benefits and claims, net656 828 2,933 3,193 
Adjusted expenses:
Amortization of deferred policy acquisition costs81 82 245 242 
Insurance commissions111 110 328 330 
Insurance and other expenses271 285 845 785 
Total benefits and adjusted expenses Aflac Japan1,119 1,305 4,351 4,550 
Aflac U.S.:
Benefits and claims, excluding reserve remeasurement752 711 2,219 2,130 
Reserve remeasurement (gains) losses(71)(17)(110)(71)
Total benefits and claims, net681 694 2,109 2,059 
Adjusted expenses:
Amortization of deferred policy acquisition costs137 132 410 396 
Insurance commissions143 141 417 422 
Insurance and other expenses392 367 1,120 1,102 
Total benefits and adjusted expenses Aflac U.S.1,353 1,334 4,056 3,979 
Corporate and other274 210 873 687 
Total adjusted expenses$2,746 $2,849 $9,280 $9,216 
Pretax earnings:
Aflac Japan (1)
$1,216 $1,073 $2,728 $2,747 
Aflac U.S. 375 350 1,121 1,089 
Corporate and other (2)
69 15 132 36 
Pretax adjusted earnings1,660 1,438 3,981 3,872 
Other income (loss)(1)0 (54)(1)
Net investment gains (losses)275 (1,408)(1,109)239 
Reconciling items:
Amortized hedge costs13 7 31 19 
Amortized hedge income(20)(25)(80)(87)
Net interest (income) expense from derivatives associated
  with certain investment strategies		66 88 195 265 
Impact of interest from derivatives associated with notes payable1 (8)(3)(25)
Total earnings before income taxes$1,994 $92 $2,961 $4,282 
Income taxes applicable to pretax adjusted earnings$333 $227 $791 $665 
Effect of foreign currency translation on after-tax adjusted earnings1 (16)16 (97)
(1) Includes a gain (loss) of $(55) and $(75) for the three-month periods and $(55) and $(80) for the nine-month periods ended September 30, 2025 and 2024, 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 $6 and $57 for the three-month periods and $22 and $119 for the nine-month periods ended September 30, 2025, and 2024, respectively, is included as a reduction to net investment income. Tax credits on these investments of $7 and $78 for the three-month periods and $24 and $142 for the nine-month periods ended September 30, 2025, and 2024, respectively, have been recorded as an income tax benefit in the consolidated statements of earnings. See Note 3 for additional information on these investments.
Internal Reinsurance: Aflac Re is a Bermuda domiciled insurer that reinsures certain policies issued by Aflac Japan and is reported as a part of Corporate and other. Under these 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 $173 million and $132 million for the three-month periods and $529 million and $396 million for the nine-month periods ended September 30, 2025 and 2024, 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 2024 Annual Report.

Total Assets: The Company's total assets were as follows:
(In millions)September 30,
2025		December 31,
2024
Assets:
Aflac Japan$94,131 $90,210 
Aflac U.S.22,569 21,930 
Corporate and other5,606 5,426 
    Total assets$122,306 $117,566