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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Operations by Segment - Pretax Earnings (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income (loss) |  |  |  |  |  |  |  |  |  | $ 39 | $ 0 | $ (73)
Net investment gains (losses) |  | $ (511) | $ 423 | $ 555 | $ 123 | $ (521) | $ 199 | $ 564 | $ 122 | 590 | 363 | 468
Earnings before income taxes |  | $ 289 | $ 1,805 | $ 1,825 | $ 1,342 | $ 538 | $ 1,329 | $ 1,708 | $ 1,294 | 5,262 | 4,869 | 5,208
Income taxes applicable to pretax adjusted earnings |  |  |  |  |  |  |  |  |  | 577 | 808 | 893
Effect of foreign currency translation on after tax adjusted earnings |  |  |  |  |  |  |  |  |  | (113) | (262) | (35)
Interest expense on debt |  |  |  |  |  |  |  |  |  | 190 | 217 | 225
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pretax adjusted earnings |  |  |  |  |  |  |  |  |  | 4,310 | 4,422 | 4,819
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Hedge costs |  |  |  |  |  |  |  |  |  | 157 | 112 | 76
Net interest cash flows from derivatives |  |  |  |  |  |  |  |  |  | 328 | 90 | 30
Hedge income |  |  |  |  |  |  |  |  |  | (121) | (68) | (57)
Gain (loss) on change in fair value of derivative, interest rate component |  |  |  |  |  |  |  |  |  | (41) | (50) | (55)
Aflac Japan | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pretax adjusted earnings | [1] |  |  |  |  |  |  |  |  | 3,234 | 3,281 | 3,756
Aflac U.S. | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pretax adjusted earnings |  |  |  |  |  |  |  |  |  | 1,501 | 1,359 | 1,356
Corporate and other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in value of federal historic rehabilitation and solar tax credit investments |  |  |  |  |  |  |  |  |  | (343) | (91) | (138)
Federal historic rehabilitation and solar tax credits, amount |  |  |  |  |  |  |  |  |  | 334 | 83 | 115
Corporate and other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pretax adjusted earnings | [2] |  |  |  |  |  |  |  |  | $ (425) | $ (218) | $ (293)
[1] | Includes a gain (loss) of $20, $(42) and $(11) for 2023, 2022 and 2021, 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 $343, $91 and $138 in 2023, 2022 and 2021, respectively, is included as a reduction to net investment income. Tax credits on these investments of $334, $83 and $115 in 2023, 2022 and 2021, 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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