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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Operations by Segment - Revenues (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net earned premiums | [1] | $ 13,440 | $ 14,123 | $ 14,901
Net investment income |  | 4,116 | 3,811 | 3,656
Other income (loss) |  | 100 | 177 | 220
Total revenues |  | 18,927 | 18,701 | 19,140
Net investment gains (losses) |  | 1,271 | 590 | 363
Remeasurement gain (loss), deferred profit liability for limited-payment contracts |  | (81) | 20 | (42)
Change in value of federal historic rehabilitation and solar tax credit investments |  | (165) | (343) | (91)
Federal historic rehabilitation and solar tax credits, amount |  | 164 | 334 | 83
Operating Segments |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Total revenues |  | 17,405 | 17,747 | 18,643
Segment Reconciling Items |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net investment gains (losses) |  | 1,271 | 590 | 363
Amortized hedge costs |  | 26 | 157 | 112
Amortized hedge income |  | (113) | (121) | (68)
Net interest (income) expense from derivatives associated with certain investment strategies |  | 338 | 328 | 90
Aflac Japan |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net earned premiums |  | 6,930 | 8,047 | 9,186
Net investment income |  | 3,032 | 3,033 | 2,867
Aflac Japan | Operating Segments |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net earned premiums | [1] | 6,930 | 8,047 | 9,186
Net investment income |  | 2,701 | 2,582 | 2,669
Other income (loss) |  | 28 | 35 | 35
Total revenues | [1] | 9,659 | 10,664 | 11,890
Aflac U.S. |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net earned premiums |  | 5,829 | 5,675 | 5,570
Net investment income |  | 883 | 854 | 759
Aflac U.S. | Operating Segments |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net earned premiums |  | 5,829 | 5,675 | 5,570
Net investment income |  | 847 | 820 | 755
Other income (loss) |  | 63 | 128 | 161
Total revenues |  | 6,739 | 6,623 | 6,486
Corporate and other |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net earned premiums |  | 681 | 400 | 145
Net investment income |  | 201 | (77) | 30
Corporate and other | Operating Segments |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Total revenues | [2] | $ 1,007 | $ 460 | $ 267
[1] | Includes a gain (loss) of $(81), $20 and $(42) in 2024, 2023 and 2022, 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 $165, $343 and $91 in 2024, 2023 and 2022, respectively, is included as a reduction to net investment income. Tax credits on these investments of $164, $334 and $83 in 2024, 2023 and 2022, 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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