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Schedule II - Aflac Incorporated (Parent Only) - Additional Information (Detail) (Parent Company, Yen Denominated Uridashi and Samurai Notes, JPY ¥)
In Billions, unless otherwise specified
 12 Months Ended
Dec. 31, 2009
Parent Company | Yen Denominated Uridashi and Samurai Notes
  
Condensed Financial Statements, Captions [Line Items]  
Extinguishment of notes ¥ 2.0us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= afl_YenDenominatedUridashiAndSamuraiNotesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember