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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION - (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred policy acquisition costs |  | $ 8,758 | $ 9,132 | $ 9,239
Future policy benefits & unpaid policy claims |  | 70,762 | 83,979 |
Unearned premiums |  | 1,286 | 1,451 |
Other policyholders’ funds |  | 5,460 | 6,169 |
Net earned premiums | [1] | 13,440 | 14,123 | 14,901
Net investment income |  | 4,116 | 3,811 | 3,656
Benefits and claims, net |  | 7,450 | 8,211 | 8,887
Amortization of deferred policy acquisition costs |  | 851 | 816 | 792
Other operating expenses |  | 4,209 | 4,412 | 4,592
Premiums written |  | 13,771 | 14,237 | 14,943
Intercompany eliminations |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred policy acquisition costs |  | 0 | 0 |
Future policy benefits & unpaid policy claims |  | (5,905) | (5,121) |
Unearned premiums |  | (38) | (26) |
Other policyholders’ funds |  | 0 | 0 |
Aflac Japan |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred policy acquisition costs |  | 5,102 | 5,559 |
Future policy benefits & unpaid policy claims |  | 60,890 | 73,641 |
Unearned premiums |  | 1,199 | 1,358 |
Other policyholders’ funds |  | 5,460 | 6,169 |
Net earned premiums |  | 6,930 | 8,047 | 9,186
Net investment income |  | 3,032 | 3,033 | 2,867
Benefits and claims, net |  | 4,317 | 5,313 | 6,191
Amortization of deferred policy acquisition costs |  | 321 | 326 | 338
Other operating expenses |  | 1,527 | 1,790 | 2,080
Premiums written |  | 7,866 | 8,571 | 9,474
Aflac U.S. |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred policy acquisition costs |  | 3,656 | 3,573 |
Future policy benefits & unpaid policy claims |  | 10,960 | 11,492 |
Unearned premiums |  | 103 | 107 |
Other policyholders’ funds |  | 0 | 0 |
Net earned premiums |  | 5,829 | 5,675 | 5,570
Net investment income |  | 883 | 854 | 759
Benefits and claims, net |  | 2,726 | 2,431 | 2,555
Amortization of deferred policy acquisition costs |  | 530 | 490 | 455
Other operating expenses |  | 2,064 | 2,201 | 2,117
Premiums written |  | 5,905 | 5,666 | 5,469
Corporate and other |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
Deferred policy acquisition costs |  | 0 | 0 |
Future policy benefits & unpaid policy claims |  | 4,817 | 3,967 |
Unearned premiums |  | 22 | 12 |
Other policyholders’ funds |  | 0 | 0 |
Net earned premiums |  | 681 | 400 | 145
Net investment income |  | 201 | (77) | 30
Benefits and claims, net |  | 407 | 467 | 141
Amortization of deferred policy acquisition costs |  | 0 | 0 | 0
Other operating expenses |  | 618 | 421 | 395
Premiums written |  | $ 0 | $ 0 | $ 0
[1] | Includes a gain (loss) of $(81), $20 and $(42) in 2024, 2023 and 2022, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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