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SHARE-BASED COMPENSATION - Expense Recognized in Connection with Share-Based Awards (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                      
Earnings before income taxes $ 1,075us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,074us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,238us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,104us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,028us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,069us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,358us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 1,361us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 4,491us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 4,816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 4,302us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net earnings                 2,951us-gaap_NetIncomeLoss 3,158us-gaap_NetIncomeLoss 2,866us-gaap_NetIncomeLoss
Net earnings per share:                      
Basic (in dollars per share) $ 1.57us-gaap_EarningsPerShareBasic $ 1.56us-gaap_EarningsPerShareBasic $ 1.79us-gaap_EarningsPerShareBasic $ 1.61us-gaap_EarningsPerShareBasic $ 1.46us-gaap_EarningsPerShareBasic $ 1.51us-gaap_EarningsPerShareBasic $ 1.91us-gaap_EarningsPerShareBasic $ 1.91us-gaap_EarningsPerShareBasic $ 6.54us-gaap_EarningsPerShareBasic $ 6.80us-gaap_EarningsPerShareBasic $ 6.14us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 1.57us-gaap_EarningsPerShareDiluted $ 1.56us-gaap_EarningsPerShareDiluted $ 1.78us-gaap_EarningsPerShareDiluted $ 1.60us-gaap_EarningsPerShareDiluted $ 1.45us-gaap_EarningsPerShareDiluted $ 1.50us-gaap_EarningsPerShareDiluted $ 1.90us-gaap_EarningsPerShareDiluted $ 1.90us-gaap_EarningsPerShareDiluted $ 6.50us-gaap_EarningsPerShareDiluted $ 6.76us-gaap_EarningsPerShareDiluted $ 6.11us-gaap_EarningsPerShareDiluted
Share Based Compensation Expense                      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                      
Earnings from continuing operations                 41us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
37us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
37us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
Earnings before income taxes                 41us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
37us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
37us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
Net earnings                 $ 28us-gaap_NetIncomeLoss
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
$ 25us-gaap_NetIncomeLoss
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
$ 26us-gaap_NetIncomeLoss
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
Net earnings per share:                      
Basic (in dollars per share)                 $ 0.06us-gaap_EarningsPerShareBasic
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
$ 0.05us-gaap_EarningsPerShareBasic
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
$ 0.06us-gaap_EarningsPerShareBasic
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
Diluted (in dollars per share)                 $ 0.06us-gaap_EarningsPerShareDiluted
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
$ 0.05us-gaap_EarningsPerShareDiluted
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember
$ 0.06us-gaap_EarningsPerShareDiluted
/ us-gaap_AwardTypeAxis
= afl_StockBasedCompensationExpenseMember