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POLICY LIABILITIES - Liability for Future Policy Benefits (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability amounts |  | $ 90,335 | $ 86,368 |
Aflac Japan |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 3.20% | 3.30% | 3.40%
Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 5.30% | 5.30% | 5.40%
Intercompany eliminations |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability amounts | [1] | $ (532) | $ (583) |
Liability for future policy benefits, interest rate |  | 2.00% |  |
Health insurance | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability amounts |  | $ 50,941 | 49,496 |
Health insurance | Aflac Japan | Lower Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 0.60% |  |
Health insurance | Aflac Japan | Upper Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 6.75% |  |
Health insurance | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability amounts |  | $ 8,646 | 8,442 |
Health insurance | Aflac U.S. | Lower Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 3.00% |  |
Health insurance | Aflac U.S. | Upper Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 7.00% |  |
Life insurance | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability amounts |  | $ 30,520 | 28,318 |
Life insurance | Aflac Japan | Lower Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 1.00% |  |
Life insurance | Aflac Japan | Upper Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 4.50% |  |
Life insurance | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability amounts |  | $ 760 | $ 695 |
Life insurance | Aflac U.S. | Lower Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 2.50% |  |
Life insurance | Aflac U.S. | Upper Limit |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for future policy benefits, interest rate |  | 6.00% |  |
[1] | Elimination entry necessary due to recapture of a portion of policy liabilities ceded externally, as a result of the reinsurance retrocession transaction as described in Note 8 of the Notes to the Consolidated Financial Statements

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- Definition Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117419472&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI http://asc.fasb.org/extlink&oid=117419784&loc=SL117819541-158441 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)(1)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 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 http://asc.fasb.org/extlink&oid=117419843&loc=SL117420844-207641 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117419472&loc=d3e14931-158439 + Details
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