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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net earned premiums | [1] | $ 3,372 | $ 3,328 | $ 10,223 | $ 10,109
Net investment income |  | 1,067 | 1,006 | 3,103 | 3,100
Other income |  | 26 | 23 | 81 | 76
Total revenues |  | 4,740 | 2,949 | 12,298 | 13,524
Net investment gains (losses) |  | 275 | (1,408) | (1,109) | 239
Remeasurement gain (loss), deferred profit liability for limited-payment contracts |  | (55) | (75) | (55) | (80)
Change in value of federal historic rehabilitation and solar tax credit investments |  | (6) | (57) | (22) | (119)
Federal historic rehabilitation and solar tax credits, amount |  | 7 | 78 | 24 | 142
Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Total revenues |  | 4,406 | 4,287 | 13,261 | 13,088
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net investment gains (losses) |  | 275 | (1,408) | (1,109) | 239
Amortized hedge costs |  | 13 | 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
Aflac Japan | Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net earned premiums | [1] | 1,663 | 1,709 | 5,105 | 5,241
Net investment income |  | 665 | 662 | 1,950 | 2,036
Other income |  | 7 | 7 | 24 | 20
Total revenues | [1] | 2,335 | 2,378 | 7,079 | 7,297
Aflac U.S. | Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net earned premiums |  | 1,495 | 1,459 | 4,501 | 4,388
Net investment income |  | 214 | 210 | 623 | 634
Other income |  | 19 | 15 | 53 | 46
Total revenues |  | 1,728 | 1,684 | 5,177 | 5,068
Corporate and other | Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Total revenues | [2] | $ 343 | $ 225 | $ 1,005 | $ 723
[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.

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