Schedule II - Aflac Incorporated - Aggregate Contractual Maturities of Notes Payable (Detail) $ in Millions	Dec. 31, 2022 USD ($)
Condensed Financial Statements, Captions [Line Items]
2023	$ 0
2024	0
2025	93
2026	700
2027	540
Thereafter	6,021
Total	7,354
Parent Company
Condensed Financial Statements, Captions [Line Items]
2023	0
2024	0
2025	93
2026	700
2027	540
Thereafter	5,795
Total	$ 7,128

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