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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of Reportable Insurance Business Segments | segment     2  
Net earned premiums $ 5,022 $ 4,380 $ 14,447 $ 13,176
Net investment income 842 784 2,465 2,343
Total revenues 5,716 5,040 16,604 15,553
Other non-operating income (loss) (18) (27) [1] (97) (39) [1]
Realized investment gains (losses), non-operating [2] (166) (136) (324) (36)
Gain (loss) on change in fair value of derivative, interest rate component, operating 20 22 64 62
September Twenty Fifteen Profit Repatriation        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Foreign Currency Transaction Gain (Loss), Realized   14   14
Aflac Japan        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net earned premiums 3,596 2,980 10,177 9,036
Net investment income 661 606 1,925 1,824
Other income (loss) 11 8 29 23
Total revenues 4,268 3,594 12,131 10,883
Aflac U.S.        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net earned premiums 1,365 1,345 4,093 4,016
Net investment income 176 173 526 507
Other income (loss) 1 2 5 6
Total revenues 1,542 1,520 4,624 4,529
Other business segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenues 70 67 206 159
Total Business Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenues 5,880 5,181 16,961 15,571
Corporate        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenues 72 73 209 242
Intercompany eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenues $ (52) $ (51) $ (145) $ (185)
[1] Includes a loss of $14 for the three- and nine-month periods ended September 30, 2015, 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).
[2] Excluding a gain of $20 and $22 for the three-month periods and $64 and $62 for the nine-month periods ended September 30, 2016, and 2015, respectively, 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