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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

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