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COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
agreements
Dec. 31, 2014
IBM Mainframe Computer Operations and Support Agreement
USD ($)
Dec. 31, 2014
IBM Mainframe Computer Operations and Support Agreement
JPY (¥)
Dec. 31, 2014
IBM Distributed Computer Mid Range Server Operations and Support Agreement
USD ($)
Dec. 31, 2014
IBM Distributed Computer Mid Range Server Operations and Support Agreement
JPY (¥)
Dec. 31, 2014
IBM Application Maintenance and Development Services Agreement
USD ($)
Dec. 31, 2014
IBM Application Maintenance and Development Services Agreement
JPY (¥)
Dec. 31, 2014
Accenture Application Maintenance and Development Services Agreement
USD ($)
Dec. 31, 2014
Accenture Application Maintenance and Development Services Agreement
JPY (¥)
Dec. 31, 2014
NTTDATA Application Maintenance and Development Services
USD ($)
Dec. 31, 2014
NTTDATA Application Maintenance and Development Services
JPY (¥)
Dec. 31, 2014
NTT Comware Application Maintenance and Development Services
USD ($)
Dec. 31, 2014
NTT Comware Application Maintenance and Development Services
JPY (¥)
Commitments and Contingencies Disclosure [Line Items]                          
Number of operating service agreements, technology and consulting 3afl_NumberofOperatingServiceAgreementsTechnologyandConsulting                        
Number of operating service agreements, management consulting and technology 1afl_NumberofOperatingServiceAgreementsManagementConsultingandTechnology                        
Outsourcing agreements, remaining term   1 year 1 year 1 year 1 year 3 years 3 years 3 years 3 years 2 years 2 years 3 years 3 years
Outsourcing agreements, aggregate remaining cost   $ 40us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_IBMMainframeComputerOperationsAndSupportMember
¥ 4,800us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_IBMMainframeComputerOperationsAndSupportMember
$ 32us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_IBMDistributedComputerMidRangeServerOperationsAndSupportMember
¥ 3,900us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_IBMDistributedComputerMidRangeServerOperationsAndSupportMember
$ 36us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_IBMApplicationMaintenanceAndDevelopmentServicesMember
¥ 4,400us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_IBMApplicationMaintenanceAndDevelopmentServicesMember
$ 31us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_AccentureApplicationMaintenanceAndDevelopmentServicesMember
¥ 3,800us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_AccentureApplicationMaintenanceAndDevelopmentServicesMember
$ 19us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_NTTDATAApplicationMaintenanceandDevelopmentServicesMember
¥ 2,300us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_NTTDATAApplicationMaintenanceandDevelopmentServicesMember
$ 19us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_NTTComwareApplicationMaintenanceandDevelopmentServicesMember
¥ 2,300us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= afl_NTTComwareApplicationMaintenanceandDevelopmentServicesMember
Number of operating service agreements, information technology and data services 2afl_NumberofOperatingServiceAgreementsInformationTechnologyandDataServices                        
Operating Leases, lease terms expire in various years through 2022