BUSINESS SEGMENT INFORMATION The Company consists of two reportable insurance business segments: Aflac Japan and Aflac U.S., both of which sell supplemental health and life insurance. Operating business segments that are not individually reportable and business activities, including reinsurance retrocession activities, not included in Aflac Japan or Aflac U.S. are included in the "Corporate and other" category. The Company does not allocate corporate overhead expenses to business segments. Consistent with U.S. GAAP accounting guidance for segment reporting, the Company evaluates and manages its business segments using a financial performance measure called pretax adjusted earnings. Adjusted earnings are adjusted revenues less benefits and adjusted expenses. The adjustments to both revenues and expenses account for certain items that cannot be predicted or that are outside managements control. Adjusted revenues are U.S. GAAP total revenues excluding realized investment gains and losses, except for amortized hedge costs related to foreign currency exposure management strategies and net interest cash flows from derivatives associated with certain investment strategies. Adjusted expenses are U.S. GAAP total acquisition and operating expenses including the impact of interest cash flows from derivatives associated with notes payable but excluding any nonrecurring or other items not associated with the normal course of the Companys insurance operations and that do not reflect Aflacs underlying business performance. The Company excludes income taxes related to operations to arrive at pretax adjusted earnings. Information regarding operations by segment follows: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2018 2017 2018 2017 Revenues: Aflac Japan: Net earned premiums $ 3,159 $ 3,200 $ 9,649 $ 9,616 Net investment income, less amortized hedge costs 606 561 1,801 1,676 Other income 10 11 31 31 Total Aflac Japan 3,775 3,772 11,481 11,323 Aflac U.S.: Net earned premiums 1,426 1,393 4,280 4,172 Net investment income 187 181 544 539 Other income 3 1 7 3 Total Aflac U.S. 1,616 1,575 4,831 4,714 Corporate and other 82 69 245 204 Total adjusted revenues 5,473 5,416 16,557 16,241 Realized investment gains (losses) (1),(2),(3) 104 90 75 2 Total revenues $ 5,577 $ 5,506 $ 16,632 $ 16,243 (1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $59 and $60 for the three- month periods and $168 and for both the nine -month periods ended September 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. (2) Amortized hedge costs in Aflac Japan were partially offset by derivatives entered into as part of corporate activities and resulted in a benefit of $9 for the three-month period and $18 for the nine -month period ended September 30, 2018 , respectively, which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations. (3) An immaterial amount of net interest cash flows from derivatives associated with certain investment strategies in the three- and nine -month periods ended September 30, 2018 , were reclassified from realized investment gains (losses) into net investment income when analyzing operations. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2018 2017 2018 2017 Pretax earnings: Aflac Japan $ 756 $ 748 $ 2,411 $ 2,308 Aflac U.S. 334 316 1,011 956 Corporate and other (29 ) (50 ) (113 ) (150 ) Pretax adjusted earnings 1,061 1,014 3,309 3,114 Realized investment gains (losses) (1),(2),(3),(4) 88 71 25 (57 ) Other income (loss) (3 ) (10 ) (73 ) (38 ) Total earnings before income taxes $ 1,146 $ 1,075 $ 3,261 $ 3,019 Income taxes applicable to pretax adjusted earnings $ 270 $ 338 $ 862 $ 1,031 Effect of foreign currency translation on after-tax adjusted earnings (1 ) (29 ) 27 (31 ) (1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $59 and $60 for the three- month periods and $168 for both the nine -month periods ended September 30, 2018 , and 2017 , respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing segment operations. (2) Amortized hedge costs in Aflac Japan were partially offset by derivatives entered into as part of corporate activities and resulted in a benefit of $9 for the three-month period and $18 for the nine -month period ended September 30, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations. (3) An immaterial amount of net interest cash flows from derivatives associated with certain investment strategies in the three- and nine -month periods ended September 30, 2018 , were reclassified from realized investment gains (losses) into net investment income when analyzing operations. (4) Excluding a gain of $17 and $19 for the three-month periods and $50 and $60 for the nine -month periods ended September 30, 2018 , and 2017 , respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is included in adjusted earnings when analyzing segment operations Assets were as follows: (In millions) September 30, 2018 December 31, 2017 Assets: Aflac Japan $ 116,181 $ 114,402 Aflac U.S. 19,585 19,893 Corporate and other 2,175 2,922 Total assets $ 137,941 $ 137,217