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BUSINESS SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 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 56% in the three-month periods ended March 31, 2025 and 2024, respectively. The percentage of the Company's total assets attributable to Aflac Japan was 78% at March 31, 2025, compared with 77% at December 31, 2024.
Information regarding operations by reportable segment and Corporate and other is presented in the following tables.
  
Three Months Ended March 31,
(In millions)20252024
Revenues:
Aflac Japan:
Net earned premiums (1)
$1,681 $1,816 
Adjusted net investment income586 648 
Other income5 9 
Total adjusted revenue Aflac Japan2,272 2,473 
Aflac U.S.:
Net earned premiums1,502 1,475 
Adjusted net investment income202 206 
Other income17 18 
Total adjusted revenue Aflac U.S.1,721 1,699 
Corporate and other (2)
326 247 
Total adjusted revenues4,319 4,419 
Net investment gains (losses)(963)951 
Reconciling items:
Amortized hedge costs7 6 
Amortized hedge income(30)(28)
Net interest (income) expense from derivatives
  associated with certain investment strategies		65 88 
Total revenues$3,398 $5,436 
(1) Includes a gain (loss) of an immaterial amount and $(3) for the three-month periods ended March 31, 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 $8 and $32 for the three-month periods ended March 31, 2025 and 2024, respectively, is included as a reduction to net investment income. Tax credits on these investments of $7 and $33 for the three-month periods ended March 31, 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 March 31,
(In millions)20252024
Adjusted revenues:
Aflac Japan (1)
$2,272 $2,473 
Aflac U.S.1,721 1,699 
Corporate and other (2)
326 247 
Total adjusted revenues4,319 4,419 
Benefits and adjusted expenses:
Aflac Japan:
Benefits and claims, excluding reserve remeasurement1,130 1,243 
Reserve remeasurement (gains) losses(25)(26)
Total benefits and claims, net1,105 1,217 
Adjusted expenses:
Amortization of deferred policy acquisition costs79 83 
Insurance commissions105 114 
Insurance and other expenses261 249 
Total benefits and adjusted expenses Aflac Japan1,550 1,663 
Aflac U.S.:
Benefits and claims, excluding reserve remeasurement731 715 
Reserve remeasurement (gains) losses(15)(29)
Total benefits and claims, net716 686 
Adjusted expenses:
Amortization of deferred policy acquisition costs137 132 
Insurance commissions135 141 
Insurance and other expenses375 384 
Total benefits and adjusted expenses Aflac U.S.1,363 1,343 
Corporate and other283 250 
Total adjusted expenses$3,196 $3,256 
Pretax earnings:
Aflac Japan (1)
$722 $810 
Aflac U.S. 358 356 
Corporate and other (2)
43 (3)
    Pretax adjusted earnings1,123 1,163 
Other income (loss)(53)(2)
Net investment gains (losses)(963)951 
Reconciling items:
Amortized hedge costs7 6 
Amortized hedge income(30)(28)
Net interest (income) expense from derivatives
  associated with certain investment strategies		65 88 
Impact of interest from derivatives associated
  with notes payable
(4)(8)
    Total earnings before income taxes$145 $2,170 
Income taxes applicable to pretax adjusted earnings$217 $202 
Effect of foreign currency translation on after-tax
  adjusted earnings		(8)(44)
(1) Includes a gain (loss) of an immaterial amount and $(3) for the three-month periods ended March 31, 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 $8 and $32 for the three-month periods ended March 31, 2025, and 2024, respectively, is included as a reduction to net investment income. Tax credits on these investments of $7 and $33 for the three-month periods ended March 31, 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 $178 million and $136 million for the three-month periods ended March 31, 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)March 31,
2025		December 31,
2024
Assets:
Aflac Japan$93,430 $90,210 
Aflac U.S.21,881 21,930 
Corporate and other4,947 5,426 
    Total assets$120,258 $117,566