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BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Pretax adjusted earnings |  | $ 1,139 | $ 1,141 | $ 2,273 | [1] | $ 2,301 | [1]
Net investment gains (losses) | [2],[3],[4],[5],[6] | 651 | 567 | 859 |  | 701 |
Other income (loss) |  | 35 | 0 | 35 |  | 0 |
Earnings before income taxes |  | 1,825 | 1,708 | 3,167 |  | 3,002 |
Income taxes applicable to pretax adjusted earnings |  | 186 | 195 | 366 |  | 414 |
Effect of foreign currency translation on after-tax adjusted earnings |  | (25) | (59) | (66) |  | (94) |
Interest expense on debt |  | 36 | 41 | 70 |  | 82 |
Aflac Japan |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Pretax adjusted earnings | [2],[5] | 822 | 873 | 1,610 |  | 1,743 |
Hedge costs |  | 63 | 30 | 122 |  | 55 |
Net interest cash flows from derivatives |  | (73) | (2) | (135) |  | (12) |
Aflac U.S. |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Pretax adjusted earnings | [6] | 369 | 343 | 721 |  | 675 |
Net interest cash flows from derivatives |  | (8) | 1 | (15) |  | 2 |
Corporate and other |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Pretax adjusted earnings | [3],[4],[7] | (52) | (75) | (58) |  | (117) |
Hedge income |  | 38 | 14 | 67 |  | 25 |
Gain (loss) on change in fair value of derivative, interest rate component |  | 12 | 12 | 24 |  | 25 |
Change in value of federal historic rehabilitation and solar tax credit investments |  | (53) | (31) | (105) |  | (42) |
Federal historic rehabilitation and solar tax credits, amount |  | $ 56 | $ 28 | $ 108 |  | $ 44 |
[1] | Includes $36 and $41 for the three-month periods and $70 and $82 for the six-month periods ended June 30, 2023, and 2022, respectively, of interest expense on debt.
[2] | Amortized hedge costs of $63 and $30 for the three-month periods and $122 and $55 for the six-month periods ended June 30, 2023, and 2022, respectively, related to certain foreign currency exposure management strategies have been reclassified from net investment gains (losses) and reported as a deduction from net investment income when analyzing operations.
[3] | A gain of $12 and $12 for the three-month periods and $24 and $25 for the six-month periods ended June 30, 2023, and 2022, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable has been reclassified from net investment gains (losses) and included in adjusted earnings when analyzing operations.
[4] | Amortized hedge income of $38 and $14 for the three-month periods and $67 and $25 for the six-month periods ended June 30, 2023, and 2022, respectively, related to certain foreign currency exposure management strategies has been reclassified from net investment gains (losses) and reported as an increase in net investment income when analyzing operations.
[5] | Net interest cash flows from derivatives associated with certain investment strategies of $(73) and $(2) for the three-month periods and $(135) and $(12) for the six-month periods ended June 30, 2023, and 2022, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income when analyzing operations.
[6] | Net interest cash flows from derivatives associated with certain investment strategies of $(8) and $1 for the three-month periods and $(15) and $2 for the six-month periods ended June 30, 2023, and 2022, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income when analyzing operations.
[7] | The change in value of federal historic rehabilitation and solar investments in partnerships of $53 and $31 for the three-month periods and $105 and $42 for the six-month periods ended June 30, 2023, and 2022, respectively, is included as a reduction to net investment income. Tax credits on these investments of $56 and $28 for the three-month periods and $108 and $44 for the six-month periods ended June 30, 2023, and 2022, respectively, have been recorded as an income tax benefit in the consolidated statement of earnings. See Note 3 of the Notes to the Consolidated Financial Statements for additional information on these investments.

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