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Quarterly Financial And Common Stock Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 1,829 | $ 1,599 | $ 1,492 | $ 1,953 | $ 1,778 | $ 1,527 | $ 1,449 | $ 1,829 | $ 6,873 | $ 6,583 | $ 6,399
Operating income | 250 | 294 | 255 | 363 | 379 | 330 | 241 | 388 | 1,162 | 1,338 | 1,256
Net Income | 109 | 169 | 140 | 241 | (2) | 172 | 93 | 199 | 659 | 462 | 553
Income attributable to noncontrolling interests | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 2 | 2 | 2
Net income (loss) available to common stockholders | $ 108 | $ 169 | $ 139 | $ 241 | $ (3) | $ 172 | $ 92 | $ 199 | $ 657 | $ 460 | $ 551
Basic earnings per average common share (in dollars per share) | $ 0.38 | $ 0.60 | $ 0.49 | $ 0.86 | $ (0.01) | $ 0.61 | $ 0.33 | $ 0.71 | $ 2.33 | $ 1.64 | $ 1.99
Diluted earnings per average common share (in dollars per share) | $ 0.38 | $ 0.59 | $ 0.49 | $ 0.86 | $ (0.01) | $ 0.61 | $ 0.33 | $ 0.71 | $ 2.32 | $ 1.64 | $ 1.98
Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 1,712 | $ 1,502 | $ 1,395 | $ 1,855 | $ 1,686 | $ 1,437 | $ 1,362 | $ 1,737 | $ 6,464 | $ 6,222 | $ 6,064
Operating income | 231 | 271 | 229 | 334 | 363 | 308 | 222 | 359 | 1,065 | 1,252 | 1,197
Net Income | 131 | 180 | 152 | 242 | 136 | 181 | 104 | 211 | 705 | 632 | 616
Preferred stock dividends | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 2 | 2 | 2
Net income available to common stockholder | $ 130 | $ 180 | $ 151 | $ 242 | $ 135 | $ 181 | $ 103 | $ 211 | $ 703 | $ 630 | $ 614

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