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BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other income (loss) |  | $ 0 | $ 35 | $ (2) | $ 35
Net investment gains (losses) |  | 696 | 555 | 1,647 | 678
Earnings before income taxes |  | 2,019 | 1,825 | 4,190 | 3,167
Income taxes applicable to pretax adjusted earnings |  | 235 | 186 | 438 | 366
Effect of foreign currency translation on after-tax adjusted earnings |  | (37) | (25) | (81) | (66)
Remeasurement gain (loss), deferred profit liability for limited-payment contracts |  | (2) | (1) | (5) | (1)
Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Pretax adjusted earnings |  | 1,270 | 1,139 | 2,434 | 2,273
Segment Reconciling Items |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Amortized hedge costs |  | 7 | 63 | 13 | 122
Amortized hedge income |  | (34) | (38) | (62) | (67)
Net interest (income) expense from from derivatives associated with certain investment strategies |  | 89 | 79 | 177 | 148
Impact of interest from derivatives associated with notes payable |  | (9) | (8) | (17) | (22)
Aflac Japan | Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Pretax adjusted earnings | [1] | 864 | 822 | 1,674 | 1,610
Aflac U.S. | Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Pretax adjusted earnings |  | 383 | 369 | 739 | 721
Corporate and other |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Change in value of federal historic rehabilitation and solar tax credit investments |  | (30) | (53) | (62) | (105)
Federal historic rehabilitation and solar tax credits, amount |  | 31 | 56 | 64 | 108
Corporate and other | Operating Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Pretax adjusted earnings | [2] | $ 23 | $ (52) | $ 21 | $ (58)
[1] | Includes a gain (loss) of $(2) and $(1) for the three-month periods and $(5) and $(1) for the six-month periods ended June 30, 2024 and 2023, 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 $30 and $53 for the three-month periods and $62 and $105 for the six-month periods ended June 30, 2024, and 2023, respectively, is included as a reduction to net investment income. Tax credits on these investments of $31 and $56 for the three-month periods and $64 and $108 for the six-month periods ended June 30, 2024, and 2023, 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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