Presented in the following tables is financial information by reportable segment: In Millions Years Ended December 31 2018 2017 2016 CMS Energy, including Consumers Operating revenue Electric utility $ 4,561 $ 4,448 $ 4,379 Gas utility 1,903 1,774 1,685 Enterprises 252 229 215 Other reconciling items 157 132 120 Total operating revenue  CMS Energy $ 6,873 $ 6,583 $ 6,399 Consumers Operating revenue Electric utility $ 4,561 $ 4,448 $ 4,379 Gas utility 1,903 1,774 1,685 Total operating revenue  Consumers $ 6,464 $ 6,222 $ 6,064 CMS Energy, including Consumers Depreciation and amortization Electric utility $ 682 $ 654 $ 603 Gas utility 239 218 200 Enterprises 8 6 5 Other reconciling items 4 3 3 Total depreciation and amortization  CMS Energy $ 933 $ 881 $ 811 In Millions Years Ended December 31 2018 2017 2016 Consumers Depreciation and amortization Electric utility $ 682 $ 654 $ 603 Gas utility 239 218 200 Total depreciation and amortization  Consumers $ 921 $ 872 $ 803 CMS Energy, including Consumers Income from equity method investees 1 Enterprises $ 9 $ 15 $ 13 Total income from equity method investees  CMS Energy $ 9 $ 15 $ 13 CMS Energy, including Consumers Interest charges Electric utility $ 209 $ 201 $ 196 Gas utility 79 74 72 Enterprises 2  1 Other reconciling items 168 163 166 Total interest charges  CMS Energy $ 458 $ 438 $ 435 Consumers Interest charges Electric utility $ 209 $ 201 $ 196 Gas utility 79 74 72 Other reconciling items 1 1  Total interest charges  Consumers $ 289 $ 276 $ 268 CMS Energy, including Consumers Income tax expense (benefit) Electric utility $ 109 $ 245 $ 246 Gas utility 33 96 74 Enterprises 2 72 10 Other reconciling items (29 ) 11 (57 ) Total income tax expense  CMS Energy $ 115 $ 424 $ 273 Consumers Income tax expense (benefit) Electric utility $ 109 $ 245 $ 246 Gas utility 33 96 74 Other reconciling items  (2 )  Total income tax expense  Consumers $ 142 $ 339 $ 320 CMS Energy, including Consumers Net income (loss) available to common stockholders Electric utility $ 535 $ 455 $ 458 Gas utility 169 173 155 Enterprises 34 (27 ) 17 Other reconciling items (81 ) (141 ) (79 ) Total net income available to common stockholders  CMS Energy $ 657 $ 460 $ 551 In Millions Years Ended December 31 2018 2017 2016 Consumers Net income available to common stockholder Electric utility $ 535 $ 455 $ 458 Gas utility 169 173 155 Other reconciling items (1 ) 2 1 Total net income available to common stockholder  Consumers $ 703 $ 630 $ 614 CMS Energy, including Consumers Plant, property, and equipment, gross Electric utility 2 $ 16,027 $ 15,221 $ 14,540 Gas utility 2 7,919 7,080 6,283 Enterprises 412 167 157 Other reconciling items 42 38 30 Total plant, property, and equipment, gross  CMS Energy $ 24,400 $ 22,506 $ 21,010 Consumers Plant, property, and equipment, gross Electric utility 2 $ 16,027 $ 15,221 $ 14,540 Gas utility 2 7,919 7,080 6,283 Other reconciling items 17 17 15 Total plant, property, and equipment, gross  Consumers $ 23,963 $ 22,318 $ 20,838 CMS Energy, including Consumers Investments in equity method investees 1 Enterprises $ 69 $ 64 $ 62 Other reconciling items   3 Total investments in equity method investees  CMS Energy $ 69 $ 64 $ 65 CMS Energy, including Consumers Total assets Electric utility 2 $ 14,079 $ 13,906 $ 13,429 Gas utility 2 7,806 7,139 6,446 Enterprises 540 342 269 Other reconciling items 2,104 1,663 1,478 Total assets  CMS Energy $ 24,529 $ 23,050 $ 21,622 Consumers Total assets Electric utility 2 $ 14,143 $ 13,907 $ 13,430 Gas utility 2 7,853 7,139 6,446 Other reconciling items 29 53 70 Total assets  Consumers $ 22,025 $ 21,099 $ 19,946 CMS Energy, including Consumers Capital expenditures 3 Electric utility $ 865 $ 882 $ 1,007 Gas utility 958 800 611 Enterprises 246 33 10 Other reconciling items 12 7 5 Total capital expenditures  CMS Energy $ 2,081 $ 1,722 $ 1,633 In Millions Years Ended December 31 2018 2017 2016 Consumers Capital expenditures 3 Electric utility $ 865 $ 882 $ 1,007 Gas utility 958 800 611 Other reconciling items 2 1  Total capital expenditures  Consumers $ 1,825 $ 1,683 $ 1,618 1 Consumers had no significant equity method investments. 2 Amounts include a portion of Consumers other common assets attributable to both the electric and gas utility businesses. 3 Amounts include purchase of capital lease additions. Amounts also include a portion of Consumers capital expenditures for plant and equipment attributable to both the electric and gas utility businesses.