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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 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | $ 47,049 | $ 47,677 | $ 56,807 |  |
Effect of change in discount rate assumptions | 8,750 | 7,089 |  |  |
Ending balance | 55,799 | 54,766 | 72,747 |  |
Medical and other health | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 27,275 | 27,566 | 31,398 |  |
Effect of change in discount rate assumptions | 1,164 | (147) |  |  |
Ending balance | 28,439 | 27,419 | 36,021 |  |
Life insurance | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 32,370 | 32,800 | 39,002 |  |
Effect of change in discount rate assumptions | 344 | (846) |  |  |
Ending balance | 32,714 | 31,954 | 42,720 |  |
Life insurance | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 1,816 | 1,778 | 1,694 |  |
Effect of change in discount rate assumptions | (210) | (252) |  |  |
Ending balance | 1,606 | 1,526 | 1,843 |  |
Accident | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 3,376 | 3,391 | 3,594 |  |
Effect of change in discount rate assumptions | (227) | (293) |  |  |
Ending balance | 3,149 | 3,098 | 3,949 |  |
Disability | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 2,644 | 2,636 | 2,670 |  |
Effect of change in discount rate assumptions | (149) | (191) |  |  |
Ending balance | 2,495 | 2,445 | 2,871 |  |
Critical Care | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 12,836 | 12,846 | 13,079 |  |
Effect of change in discount rate assumptions | (1,019) | (1,357) |  |  |
Ending balance | 11,817 | 11,489 | 15,388 |  |
Hospital Indemnity | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 2,315 | 2,300 | 2,300 |  |
Effect of change in discount rate assumptions | (176) | (226) |  |  |
Ending balance | 2,139 | 2,074 | 2,552 |  |
Dental/Vision | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 527 | 532 | 549 |  |
Effect of change in discount rate assumptions | (33) | (44) |  |  |
Ending balance | 494 | 488 | 616 |  |
Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 5,880 | 5,940 | 6,787 |  |
Effect of change in discount rate assumptions | (110) | (358) |  |  |
Ending balance | 5,770 | 5,582 | 7,322 |  |
Other | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance | 641 | 624 | 645 |  |
Effect of change in discount rate assumptions | 15 | (2) |  |  |
Ending balance | $ 656 | $ 622 | 837 |  |
Accounting Standards Update 2018-12 | Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 56,807 |  | $ 64,056
Effect of change in discount rate assumptions |  |  | 15,940 |  |
Ending balance |  |  | 72,747 | $ 82,567 | 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 change in discount rate assumptions |  |  | 4,623 |  |
Ending balance |  |  | 36,021 | 39,618 | 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 change in discount rate assumptions |  |  | 3,718 |  |
Ending balance |  |  | 42,720 | 47,951 | 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 change in discount rate assumptions |  |  | 149 |  |
Ending balance |  |  | 1,843 | 1,789 | 1,789
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 change in discount rate assumptions |  |  | 355 |  |
Ending balance |  |  | 3,949 | 4,389 | 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 change in discount rate assumptions |  |  | 201 |  |
Ending balance |  |  | 2,871 | 3,265 | 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 change in discount rate assumptions |  |  | 2,309 |  |
Ending balance |  |  | 15,388 | 16,733 | 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 change in discount rate assumptions |  |  | 252 |  |
Ending balance |  |  | 2,552 | 2,635 | 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 change in discount rate assumptions |  |  | 67 |  |
Ending balance |  |  | 616 | 705 | 705
Accounting Standards Update 2018-12 | Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Beginning balance |  |  | 6,787 |  | 7,620
Effect of change in discount rate assumptions |  |  | 535 |  |
Ending balance |  |  | 7,322 | 8,201 | 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 change in discount rate assumptions |  |  | 192 |  |
Ending balance |  |  | $ 837 | 906 | 906
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 | 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 | 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 | Revision of Prior Period, Accounting Standards Update, Adjustment | Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Effect of change 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 change 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 change 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 change in discount rate assumptions |  |  |  | 227 |
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 change 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 change 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 change 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 change 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 change in discount rate assumptions |  |  |  | 106 |
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 change 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 change in discount rate assumptions |  |  |  | $ 245 |

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 13I -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117783724-158441 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 + Details
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