Schedule II - Aflac Incorporated - Aggregate Contractual Maturities of Notes Payable (Detail) $ in Millions	Dec. 31, 2025 USD ($)
Condensed Financial Statements, Captions [Line Items]
2026	$ 700
2027	458
2028	0
2029	539
2030	1,496
Thereafter	5,185
Total	8,378
Parent Company
Condensed Financial Statements, Captions [Line Items]
2026	700
2027	458
2028	0
2029	539
2030	1,496
Thereafter	4,994
Total	$ 8,187

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details