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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net earned premiums |  | $ 3,456 | $ 3,688
Net investment income |  | 1,000 | 943
Other income |  | 29 | 46
Total revenues |  | 5,436 | 4,800
Net investment gains (losses) |  | 951 | 123
Operating Segments |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Total revenues |  | 4,419 | 4,579
Segment Reconciling Items |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Amortized hedge costs |  | 6 | 58
Amortized hedge income |  | (28) | (29)
Net interest (income) expense from from derivatives associated with certain investment strategies |  | 88 | 69
Aflac Japan | Operating Segments |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net earned premiums |  | 1,816 | 2,170
Net investment income |  | 648 | 611
Other income |  | 9 | 9
Total revenues |  | 2,473 | 2,790
Aflac U.S. | Operating Segments |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net earned premiums |  | 1,475 | 1,428
Net investment income |  | 206 | 197
Other income |  | 18 | 35
Total revenues |  | 1,699 | 1,660
Corporate and other |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Change in value of federal historic rehabilitation and solar tax credit investments |  | (32) | (51)
Federal historic rehabilitation and solar tax credits, amount |  | 33 | 52
Corporate and other | Operating Segments |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Total revenues | [1] | $ 247 | $ 129
[1] | The change in value of federal historic rehabilitation and solar investments in partnerships of $32 and $51 for the three-month periods ended March 31, 2024, and 2023, respectively, is included as a reduction to net investment income. Tax credits on these investments of $33 and $52 for the three-month periods ended March 31, 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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