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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION - (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | $ 9,132 |  |  |  | $ 9,239 |  |  |  | $ 9,132 |  | $ 9,239 |  | $ 9,848 |
Future policy benefits & unpaid policy claims | 83,979 |  |  |  | 88,442 |  |  |  | 83,979 |  | 88,442 |  |  |
Unearned premiums | 1,451 |  |  |  | 1,825 |  |  |  | 1,451 |  | 1,825 |  |  |
Other policyholders’ funds | 6,169 |  |  |  | 6,643 |  |  |  | 6,169 |  | 6,643 |  |  |
Net premium income | 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 |
Benefits and claims, net |  |  |  |  |  |  |  |  | 8,211 |  | 8,887 |  | 10,476 |
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 816 |  | 792 |  | 835 |
Other operating expenses |  |  |  |  |  |  |  |  | 4,412 |  | 4,592 |  | 5,035 |
Premiums written |  |  |  |  |  |  |  |  | 14,237 |  | 14,943 |  | 17,137 |
Intercompany eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Future policy benefits & unpaid policy claims | (5,121) |  |  |  | (667) |  |  |  | (5,121) |  | (667) |  |  |
Unearned premiums | (26) |  |  |  | 0 |  |  |  | (26) |  | 0 |  |  |
Other policyholders’ funds | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Aflac Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 5,559 |  |  |  | 5,776 |  |  |  | 5,559 |  | 5,776 |  |  |
Future policy benefits & unpaid policy claims | 73,641 |  |  |  | 77,733 |  |  |  | 73,641 |  | 77,733 |  |  |
Unearned premiums | 1,358 |  |  |  | 1,716 |  |  |  | 1,358 |  | 1,716 |  |  |
Other policyholders’ funds | 6,169 |  |  |  | 6,639 |  |  |  | 6,169 |  | 6,639 |  |  |
Net premium income |  |  |  |  |  |  |  |  | 8,047 |  | 9,186 |  | 11,301 |
Net investment income |  |  |  |  |  |  |  |  | 3,033 |  | 2,867 |  | 3,139 |
Benefits and claims, net |  |  |  |  |  |  |  |  | 5,313 |  | 6,191 |  | 7,675 |
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 326 |  | 338 |  | 393 |
Other operating expenses |  |  |  |  |  |  |  |  | 1,790 |  | 2,080 |  | 2,549 |
Premiums written |  |  |  |  |  |  |  |  | 8,571 |  | 9,474 |  | 11,600 |
Aflac U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 3,573 |  |  |  | 3,463 |  |  |  | 3,573 |  | 3,463 |  |  |
Future policy benefits & unpaid policy claims | 11,492 |  |  |  | 11,070 |  |  |  | 11,492 |  | 11,070 |  |  |
Unearned premiums | 107 |  |  |  | 113 |  |  |  | 107 |  | 113 |  |  |
Other policyholders’ funds | 0 |  |  |  | 4 |  |  |  | 0 |  | 4 |  |  |
Net premium income |  |  |  |  |  |  |  |  | 5,675 |  | 5,570 |  | 5,614 |
Net investment income |  |  |  |  |  |  |  |  | 854 |  | 759 |  | 752 |
Benefits and claims, net |  |  |  |  |  |  |  |  | 2,431 |  | 2,555 |  | 2,639 |
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 490 |  | 455 |  | 442 |
Other operating expenses |  |  |  |  |  |  |  |  | 2,201 |  | 2,117 |  | 2,052 |
Premiums written |  |  |  |  |  |  |  |  | 5,666 |  | 5,469 |  | 5,537 |
Corporate and other |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Future policy benefits & unpaid policy claims | 3,967 |  |  |  | 306 |  |  |  | 3,967 |  | 306 |  |  |
Unearned premiums | 12 |  |  |  | (4) |  |  |  | 12 |  | (4) |  |  |
Other policyholders’ funds | $ 0 |  |  |  | $ 0 |  |  |  | 0 |  | 0 |  |  |
Net premium income |  |  |  |  |  |  |  |  | 400 |  | 145 |  | 180 |
Net investment income |  |  |  |  |  |  |  |  | (77) |  | 30 |  | (73) |
Benefits and claims, net |  |  |  |  |  |  |  |  | 467 |  | 141 |  | 161 |
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operating expenses |  |  |  |  |  |  |  |  | 421 |  | 395 |  | 434 |
Premiums written |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |
[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.

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