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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net $ 4,778 $ 5,022 $ 4,823 $ 4,602 $ 4,394 $ 4,380 $ 4,364 $ 4,432 $ 19,225 $ 17,570 $ 19,072
Net investment income 813 842 822 801 792 784 777 782 3,278 3,135 3,319
Total revenues $ 5,955 $ 5,716 $ 5,437 $ 5,451 $ 5,319 $ 5,040 $ 5,287 $ 5,226 22,559 20,872 22,728
Other non-operating income (loss)                 109 (35) [1] 67
Realized investment gains (losses), non-operating [2]                 (208) 55 171
Gain (loss) on change in fair value of derivative, interest rate component, operating                 85 85 44
Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 4,740 4,289 4,753
Aflac Japan                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 13,537 12,046 13,861
Net investment income                 2,554 2,436 2,662
Other income (loss)                 40 31 32
Total revenues                 16,131 14,513 16,555
Aflac Japan | Cancer                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 5,639 4,933 5,596
Aflac Japan | Medical and other health                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 3,429 3,092 3,770
Aflac Japan | Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 4,469 4,021 4,495
Aflac U.S.                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 5,454 5,347 5,211
Net investment income                 703 678 645
Other income (loss)                 10 8 3
Total revenues                 6,167 6,033 5,859
Aflac U.S. | Cancer                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 1,299 1,293 1,279
Aflac U.S. | Life insurance                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 271 268 258
Aflac U.S. | Accident and disability                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 2,469 2,391 2,303
Aflac U.S. | Other health                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Premiums Earned, Net                 1,415 1,395 1,371
Other business segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 275 225 43
Total Business Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 22,573 20,771 22,457
Corporate                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 284 282 281
Intercompany eliminations                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total revenues                 $ (199) (201) $ (248)
Twenty Fifteen Profit Repatriation                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Foreign currency transaction gain (loss), realized                   $ (20)  
[1] Includes a loss of $20 related to the change in value of yen repatriation received in advance of settlement of certain foreign currency derivatives. The loss was offset by derivative gains included in realized investment gains (losses).
[2] Excluding a gain of $85 in both 2016 and 2015 and $44 in 2014 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