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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, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |
Fair Value of Swaps | $ (213) | $ (589)
Notional Amount of Swaps | 15,085 | 13,370
AA |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |
Fair Value of Swaps | (6) | (1)
Notional Amount of Swaps | 161 | 161
A |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |
Fair Value of Swaps | (207) | (588)
Notional Amount of Swaps | $ 14,924 | $ 13,209

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- 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
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Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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