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DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative [Line Items] |  |
Fair Value of Swaps | $ (110) | $ (156)
Notional Amount of Swaps | 6,028 | 5,491
AA |  |
Derivative [Line Items] |  |
Fair Value of Swaps | 14 | 0
Notional Amount of Swaps | 272 | 0
A |  |
Derivative [Line Items] |  |
Fair Value of Swaps | (124) | (156)
Notional Amount of Swaps | $ 5,756 | $ 5,491

X
- Definition Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives that are exposed to counterparty credit risk + References No definition available. + Details
Name: | afl_FairValueOfDerivativesWithCounterpartyCreditRisk
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notional amount as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives that are exposed to counterparty credit risk. + References No definition available. + Details
Name: | afl_NotionalAmountOfDerivativesWithCounterpartyCreditRisk
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration