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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net earned premiums | [1] | $ 3,470 | $ 3,325 | $ 6,851 | $ 6,781
Net investment income |  | 1,081 | 1,095 | 2,036 | 2,095
Other income |  | 30 | 22 | 55 | 52
Total revenues |  | 4,160 | 5,138 | 7,558 | 10,575
Net investment gains (losses) |  | (421) | 696 | (1,384) | 1,647
Remeasurement gain (loss), deferred profit liability for limited-payment contracts |  |  | (2) |  | (5)
Change in value of federal historic rehabilitation and solar tax credit investments |  | (8) | (30) | (16) | (62)
Federal historic rehabilitation and solar tax credits, amount |  | 9 | 31 | 16 | 64
Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Total revenues |  | 4,536 | 4,380 | 8,855 | 8,800
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net investment gains (losses) |  | (421) | 696 | (1,384) | 1,647
Amortized hedge costs |  | 11 | 7 | 18 | 13
Amortized hedge income |  | (30) | (34) | (60) | (62)
Net interest (income) expense from derivatives associated with certain investment strategies |  | 64 | 89 | 129 | 177
Aflac Japan | Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net earned premiums | [1] | 1,761 | 1,715 | 3,442 | 3,531
Net investment income |  | 699 | 725 | 1,285 | 1,374
Other income |  | 12 | 7 | 17 | 14
Total revenues | [1] | 2,472 | 2,447 | 4,744 | 4,919
Aflac U.S. | Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net earned premiums |  | 1,504 | 1,455 | 3,006 | 2,930
Net investment income |  | 207 | 218 | 409 | 424
Other income |  | 17 | 11 | 34 | 30
Total revenues |  | 1,728 | 1,684 | 3,449 | 3,384
Corporate and other | Operating Segments |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Total revenues | [2] | $ 336 | $ 249 | $ 662 | $ 497
[1] | Includes a gain (loss) of an immaterial amount and $(2) for the three-month periods and an immaterial amount and $(5) for the six-month periods ended June 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 $8 and $30 for the three-month periods and $16 and $62 for the six-month periods ended June 30, 2025, and 2024, respectively, is included as a reduction to net investment income. Tax credits on these investments of $9 and $31 for the three-month periods and $16 and $64 for the six-month periods ended June 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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