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INVESTMENTS - Economic Maturities of Investments in Perpetual Securities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012
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Aflac Japan |
Investments Classified by Economic Maturity Date [Line Items] |
Due in one year or less | $ 304
Due after one year through five years | 1,167
Due after five years through 10 years | 521
Due after 10 years | 3,353
Total perpetual securities available for sale | 5,345
Due in one year or less | 308
Due after one year through five years | 1,223
Due after five years through 10 years | 551
Due after 10 years | 3,089
Total perpetual securities available for sale | 5,171
Aflac U.S. |
Investments Classified by Economic Maturity Date [Line Items] |
Due in one year or less | 0
Due after one year through five years | 5
Due after five years through 10 years | 0
Due after 10 years | 172
Total perpetual securities available for sale | 177
Due in one year or less | 0
Due after one year through five years | 5
Due after five years through 10 years | 0
Due after 10 years | 176
Total perpetual securities available for sale | $ 181

X
- Definition This item represents perpetual securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAfterFiveThroughTenYearsAmortizedCost
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of perpetual securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAfterFiveThroughTenYearsFairValue
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents perpetual securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAfterOneThroughFiveYearsAmortizedCost
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of perpetual securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAfterOneThroughFiveYearsFairValue
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents perpetual securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAfterTenYearsAmortizedCost
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale Securities, Perpetual Securities, Economic Maturities, after Ten Years, Fair Value + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAfterTenYearsFairValue
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the total of all perpetual securities grouped by economic maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesAmortizedCost
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the total of all perpetual securities grouped by economic maturity dates, at fair value, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesFairValue
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents perpetual securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesWithinOneYearAmortizedCost
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of perpetual securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | afl_AvailableForSaleSecuritiesPerpetualSecuritiesEconomicMaturitiesWithinOneYearFairValue
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | afl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration