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BUSINESS SEGMENT AND FOREIGN INFORMATION - Operations by Segment - Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net $ 4,394 $ 4,380 $ 4,364 $ 4,432 $ 4,489 $ 4,841 $ 4,888 $ 4,854 $ 17,570 $ 19,072 $ 20,135
Net investment income 792 784 777 782 808 841 843 827 3,135 3,319 3,293
Total revenues $ 5,319 $ 5,040 $ 5,287 $ 5,226 $ 5,514 $ 5,736 $ 5,838 $ 5,640 20,872 22,728 23,939
Other non-operating income (loss)                 (35) [1],[2] 67 28
Realized investment gains (losses), non-operating [3]                 55 171 389
Gain (loss) on change in fair value of derivative, interest rate component, operating                 85 44 10
Aflac Japan                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 12,046 13,861 14,982
Net investment income                 2,436 2,662 2,651
Other income (loss)                 31 32 55
Total revenues                 14,513 16,555 17,688
Aflac Japan | Cancer                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 4,933 5,596 6,123
Aflac Japan | Medical and other health                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 3,092 3,770 4,282
Aflac Japan | Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 4,021 4,495 4,577
Aflac U.S.                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 5,347 5,211 5,153
Net investment income                 678 645 632
Other income (loss)                 8 3 6
Total revenues                 6,033 5,859 5,791
Aflac U.S. | Cancer                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 1,293 1,279 1,283
Aflac U.S. | Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 268 258 252
Aflac U.S. | Accident and disability                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 2,391 2,303 2,284
Aflac U.S. | Other health                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 1,395 1,371 1,334
Other business segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 225 43 49
Total Business Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 20,771 22,457 23,528
Corporate                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 282 281 302
Intercompany eliminations                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 (201) $ (248) $ (308)
Twenty Fifteen Profit Repatriation                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Foreign currency transaction gain (loss), realized                 $ (20)    
[1] $230 for the make-whole payment associated with the early extinguishment of debt
[2] Includes a loss of $20 related to the change in value of yen repatriation received in advance of settlement of certain foreign currency derivatives. This loss was offset by derivative gains included in realized investment gains (losses).
[3] Excluding a gain of $85 in 2015, $44 in 2014 and $10 in 2013 related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is classified as an operating gain when analyzing segment operations