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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  | $ 4,671 | $ 4,736 | $ 4,681 | $ 4,691 | $ 4,591 | $ 4,636 | $ 4,706 | $ 4,745 | $ 18,780 | $ 18,677 | $ 18,531
Net investment income |  | 886 | 936 | 878 | 878 | 874 | 870 | 862 | 837 | 3,578 | 3,442 | 3,220
Total revenues |  | $ 5,603 | $ 5,536 | $ 5,511 | $ 5,657 | $ 5,126 | $ 5,577 | $ 5,589 | $ 5,464 | 22,307 | 21,758 | 21,667
Total adjusted revenues |  |  |  |  |  |  |  |  |  | 22,256 | 21,988 | 21,589
Realized investment gains (losses) | [1],[2],[3] |  |  |  |  |  |  |  |  | 51 | (230) | 78
Life insurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 3,445 | 3,674 | 4,034
Aflac Japan |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 12,772 | 12,762 | 12,752
Net investment income, less amortized hedge costs | [1],[3] |  |  |  |  |  |  |  |  | 2,496 | 2,403 | 2,235
Other income (loss) |  |  |  |  |  |  |  |  |  | 45 | 41 | 41
Net investment income |  |  |  |  |  |  |  |  |  | 2,753 | 2,639 | 2,463
Total revenues |  |  |  |  |  |  |  |  |  | 15,313 | 15,206 | 15,028
Hedge costs |  |  |  |  |  |  |  |  |  | 257 | 236 | 228
Net interest cash flows from derivatives |  |  |  |  |  |  |  |  |  | (17) |  |
Aflac Japan | Cancer |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 6,031 | 5,849 | 5,612
Aflac Japan | Medical and other health |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 3,582 | 3,516 | 3,379
Aflac Japan | Life insurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 3,159 | 3,397 | 3,761
Aflac U.S. |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 5,808 | 5,708 | 5,563
Other income (loss) |  |  |  |  |  |  |  |  |  | 22 | 8 | 5
Net investment income |  |  |  |  |  |  |  |  |  | 720 | 727 | 721
Total revenues |  |  |  |  |  |  |  |  |  | 6,550 | 6,443 | 6,289
Aflac U.S. | Cancer |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 1,309 | 1,311 | 1,308
Aflac U.S. | Life insurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 286 | 278 | 273
Aflac U.S. | Accident and disability |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 2,665 | 2,611 | 2,537
Aflac U.S. | Other health |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net premiums, principally supplemental health insurance |  |  |  |  |  |  |  |  |  | 1,548 | 1,508 | 1,445
Corporate and other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | [2] |  |  |  |  |  |  |  |  | 393 | 339 | $ 272
Hedge income |  |  |  |  |  |  |  |  |  | $ 89 | $ 36 |
[1] | Amortized hedge costs of $257, $236 and $228 in 2019, 2018 and 2017, respectively, related to certain foreign currency exposure management strategies have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing operations.
[2] | Amortized hedge income of $89 in 2019 and $36 in 2018 related to certain foreign currency exposure management strategies has been reclassified from realized investment gains (losses) and reported as an increase to net investment income when analyzing operations.
[3] | Net interest cash flows from derivatives associated with certain investment strategies of $(17) in 2019 and an immaterial amount in 2018 have been reclassified from realized investment gains (losses) and included in adjusted earnings as a component of net investment income.

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