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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact from Adoption to Liability For Future Policy Benefit, Expected Future Policy Benefits (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Ending balance | $ 123,918 | $ 141,463 |  |  |
Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 41,546 | 47,677 | $ 56,807 |  |
Effect of changes in discount rate assumptions | 5,663 | 7,089 |  |  |
Ending balance | 47,209 | 54,766 | 72,747 |  |
Medical and other health | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 23,763 | 27,566 | 31,398 |  |
Effect of changes in discount rate assumptions | (170) | (147) |  |  |
Ending balance | 23,593 | 27,419 | 36,021 |  |
Life insurance | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 28,796 | 32,800 | 39,002 |  |
Effect of changes in discount rate assumptions | (868) | (846) |  |  |
Ending balance | 27,928 | 31,954 | 42,720 |  |
Life insurance | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 1,952 | 1,778 | 1,694 |  |
Effect of changes in discount rate assumptions | (344) | (252) |  |  |
Ending balance | 1,608 | 1,526 | 1,843 |  |
Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 5,188 | 5,940 | 6,787 |  |
Effect of changes in discount rate assumptions | (332) | (358) |  |  |
Ending balance | 4,856 | 5,582 | 7,322 |  |
Other | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 687 | 624 | 645 |  |
Effect of changes in discount rate assumptions | (35) | (2) |  |  |
Ending balance | 652 | 622 | 837 |  |
Accident | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 3,339 | 3,391 | 3,594 |  |
Effect of changes in discount rate assumptions | (375) | (293) |  |  |
Ending balance | 2,964 | 3,098 | 3,949 |  |
Disability | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 2,584 | 2,636 | 2,670 |  |
Effect of changes in discount rate assumptions | (233) | (191) |  |  |
Ending balance | 2,351 | 2,445 | 2,871 |  |
Critical Care | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 12,203 | 12,846 | 13,079 |  |
Effect of changes in discount rate assumptions | (1,743) | (1,357) |  |  |
Ending balance | 10,460 | 11,489 | 15,388 |  |
Hospital Indemnity | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 2,106 | 2,300 | 2,300 |  |
Effect of changes in discount rate assumptions | (259) | (226) |  |  |
Ending balance | 1,847 | 2,074 | 2,552 |  |
Dental/Vision | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 508 | 532 | 549 |  |
Effect of changes in discount rate assumptions | (58) | (44) |  |  |
Ending balance | $ 450 | $ 488 | 616 |  |
Accounting Standards Update 2018-12 | Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 56,807 |  | $ 64,056
Effect of changes in discount rate assumptions |  |  | 15,940 |  |
Ending balance |  |  | 72,747 | $ 82,567 |
Accounting Standards Update 2018-12 | Medical and other health | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 31,398 |  | 34,638
Effect of changes in discount rate assumptions |  |  | 4,623 |  |
Ending balance |  |  | 36,021 | 39,618 |
Accounting Standards Update 2018-12 | Life insurance | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 39,002 |  | 43,729
Effect of changes in discount rate assumptions |  |  | 3,718 |  |
Ending balance |  |  | 42,720 | 47,951 |
Accounting Standards Update 2018-12 | Life insurance | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 1,694 |  | 1,562
Effect of changes in discount rate assumptions |  |  | 149 |  |
Ending balance |  |  | 1,843 | 1,789 |
Accounting Standards Update 2018-12 | Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 6,787 |  | 7,620
Effect of changes in discount rate assumptions |  |  | 535 |  |
Ending balance |  |  | 7,322 | 8,201 |
Accounting Standards Update 2018-12 | Other | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 645 |  | 661
Effect of changes in discount rate assumptions |  |  | 192 |  |
Ending balance |  |  | 837 | 906 |
Accounting Standards Update 2018-12 | Accident | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 3,594 |  | 3,818
Effect of changes in discount rate assumptions |  |  | 355 |  |
Ending balance |  |  | 3,949 | 4,389 |
Accounting Standards Update 2018-12 | Disability | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 2,670 |  | 2,919
Effect of changes in discount rate assumptions |  |  | 201 |  |
Ending balance |  |  | 2,871 | 3,265 |
Accounting Standards Update 2018-12 | Critical Care | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 13,079 |  | 13,427
Effect of changes in discount rate assumptions |  |  | 2,309 |  |
Ending balance |  |  | 15,388 | 16,733 |
Accounting Standards Update 2018-12 | Hospital Indemnity | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 2,300 |  | 2,258
Effect of changes in discount rate assumptions |  |  | 252 |  |
Ending balance |  |  | 2,552 | 2,635 |
Accounting Standards Update 2018-12 | Dental/Vision | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 549 |  | 599
Effect of changes in discount rate assumptions |  |  | 67 |  |
Ending balance |  |  | $ 616 | 705 |
Accounting Standards Update 2018-12 | As Previously Reported | Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 64,056
Accounting Standards Update 2018-12 | As Previously Reported | Medical and other health | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 34,638
Accounting Standards Update 2018-12 | As Previously Reported | Life insurance | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 43,729
Accounting Standards Update 2018-12 | As Previously Reported | Life insurance | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 1,562
Accounting Standards Update 2018-12 | As Previously Reported | Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 7,620
Accounting Standards Update 2018-12 | As Previously Reported | Other | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 661
Accounting Standards Update 2018-12 | As Previously Reported | Accident | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 3,818
Accounting Standards Update 2018-12 | As Previously Reported | Disability | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 2,919
Accounting Standards Update 2018-12 | As Previously Reported | Critical Care | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 13,427
Accounting Standards Update 2018-12 | As Previously Reported | Hospital Indemnity | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | 2,258
Accounting Standards Update 2018-12 | As Previously Reported | Dental/Vision | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  |  |  | $ 599
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 18,511 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Medical and other health | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 4,980 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Life insurance | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 4,222 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Life insurance | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 227 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 581 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Other | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 245 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Accident | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 571 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Disability | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 346 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Critical Care | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 3,306 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Hospital Indemnity | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | 377 |
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Dental/Vision | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of changes in discount rate assumptions |  |  |  | $ 106 |

X
- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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