Schedule II - Aflac Incorporated - Aggregate Contractual Maturities of Notes Payable (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Condensed Financial Statements, Captions [Line Items]
2024	$ 0
2025	87
2026	700
2027	506
2028	0
Thereafter	6,000
Total	7,293
Parent Company
Condensed Financial Statements, Captions [Line Items]
2024	0
2025	87
2026	700
2027	506
2028	0
Thereafter	5,577
Total	$ 6,870

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