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Reconciliation of Capital and Surplus Between Sap and Practices Permitted by the State of Nebraska (Detail) (Aflac, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Statutory Accounting Practices [Line Items]    
Capital and surplus, Nebraska state basis $ 6,371 $ 6,740
Capital and surplus, NAIC basis 6,363 6,576
Refundable lease deposits - Japan
   
Statutory Accounting Practices [Line Items]    
State permitted practice amount (53) (51)
Separate Account Funding Agreements
   
Statutory Accounting Practices [Line Items]    
State permitted practice amount $ 45 $ (113)