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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Operations by Segment - Revenues (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, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  | $ 3,385 | $ 3,476 | $ 3,573 | $ 3,688 | $ 3,523 | $ 3,535 | $ 3,764 | $ 4,079 | $ 14,123 | [1] | $ 14,901 | [1] | $ 17,095 | [1]
Net investment income |  | 865 | 1,004 | 999 | 943 | 896 | 920 | 937 | 903 | 3,811 |  | 3,656 |  | 3,818 |
Other income (loss) |  | 38 | 47 | 45 | 46 | 50 | 50 | 50 | 69 | 177 |  | 220 |  | 173 |
Total revenues |  | 3,777 | 4,950 | 5,172 | 4,800 | 3,948 | 4,704 | 5,315 | 5,173 | 18,701 |  | 19,140 |  | 21,554 |
Net investment gains (losses) |  | $ (511) | $ 423 | $ 555 | $ 123 | $ (521) | $ 199 | $ 564 | $ 122 | 590 |  | 363 |  | 468 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 17,747 |  | 18,643 |  | 21,037 |
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedge costs |  |  |  |  |  |  |  |  |  | 157 |  | 112 |  | 76 |
Hedge income |  |  |  |  |  |  |  |  |  | (121) |  | (68) |  | (57) |
Net interest cash flows from derivatives |  |  |  |  |  |  |  |  |  | 328 |  | 90 |  | 30 |
Life insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 1,973 |  | 2,150 |  | 2,628 |
Aflac Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 8,047 |  | 9,186 |  | 11,301 |
Net investment income |  |  |  |  |  |  |  |  |  | 3,033 |  | 2,867 |  | 3,139 |
Aflac Japan | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 2,582 |  | 2,669 |  | 3,031 |
Other income (loss) |  |  |  |  |  |  |  |  |  | 35 |  | 35 |  | 41 |
Total revenues |  |  |  |  |  |  |  |  |  | 10,664 |  | 11,890 |  | 14,373 |
Aflac Japan | Cancer | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance | [2] |  |  |  |  |  |  |  |  | 4,054 |  | 4,702 |  | 5,718 |
Aflac Japan | Medical and other health | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance | [2] |  |  |  |  |  |  |  |  | 2,451 |  | 2,706 |  | 3,287 |
Aflac Japan | Life insurance | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance | [2] |  |  |  |  |  |  |  |  | 1,542 |  | 1,778 |  | 2,296 |
Aflac U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 5,675 |  | 5,570 |  | 5,614 |
Net investment income |  |  |  |  |  |  |  |  |  | 854 |  | 759 |  | 752 |
Aflac U.S. | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 820 |  | 755 |  | 754 |
Other income (loss) |  |  |  |  |  |  |  |  |  | 128 |  | 161 |  | 121 |
Total revenues |  |  |  |  |  |  |  |  |  | 6,623 |  | 6,486 |  | 6,489 |
Aflac U.S. | Accident | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 1,284 |  | 1,314 |  | 1,362 |
Aflac U.S. | Disability | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 1,249 |  | 1,171 |  | 1,162 |
Aflac U.S. | Critical care | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 1,743 |  | 1,753 |  | 1,797 |
Aflac U.S. | Hospital indemnity | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 720 |  | 722 |  | 730 |
Aflac U.S. | Dental/vision | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 214 |  | 199 |  | 188 |
Aflac U.S. | Life insurance | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 432 |  | 372 |  | 332 |
Aflac U.S. | Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 33 |  | 39 |  | 43 |
Corporate and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 400 |  | 145 |  | 180 |
Net investment income |  |  |  |  |  |  |  |  |  | (77) |  | 30 |  | (73) |
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, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | [3] |  |  |  |  |  |  |  |  | $ 460 |  | $ 267 |  | $ 175 |
[1] | Includes a gain (loss) of $20, $(42) and $(11) in 2023, 2022 and 2021, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.
[2] | 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.
[3] | 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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