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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of Reportable Insurance Business Segments | segment     2  
Net earned premiums $ 4,706 $ 4,665 $ 9,450 $ 9,303
Net investment income 862 802 1,699 1,596
Total adjusted revenues 5,539 5,429 11,084 10,828
Realized investment gains (losses) [1],[2] 50 (1) (30) (91)
Total revenues 5,589 5,428 11,054 10,737
Gain (loss) on change in fair value of derivative, corporate 7   9  
Aflac Japan        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net earned premiums 3,227 3,222 6,490 6,416
Net investment income, less amortized hedge costs [2] 606 557 1,194 1,115
Other income (loss) 11 10 22 20
Total revenues 3,844 3,789 7,706 7,551
Hedge costs 55 56 110 108
Aflac U.S.        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net earned premiums 1,426 1,388 2,853 2,778
Net investment income 182 180 357 358
Other income (loss) 2 2 4 3
Total revenues 1,610 1,570 3,214 3,139
Corporate and other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenues [1] $ 85 $ 70 $ 164 $ 138
[1] Amortized hedge costs in Aflac Japan were partially offset by derivatives entered into as part of corporate activities and resulted in a benefit of $7 for the three-month period and $9 for the six-month period ended June 30, 2018, respectively, which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.
[2] Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $56 for the three- month periods and $110 and $108 for the six-month periods ended June 30, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations.