XML 18 R56.htm IDEA: XBRL DOCUMENT v3.20.1
Earnings Per Share - CMS Energy (Basic And Diluted EPS Computations) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income available to common stockholders    
Net income $ 243 $ 213
Average common shares outstanding    
Weighted average shares - basic (in shares) 283.3 282.8
Dilutive nonvested stock awards (in shares) 0.8 0.6
Dilutive forward equity sale contracts (in shares) 1.1 0.2
Weighted average shares - diluted (in shares) 285.2 283.6
Net income per average common share available to common stockholders    
Basic earnings per average common share (in dollars per share) $ 0.86 $ 0.75
Diluted earnings per average common share (in dollars per share) $ 0.85 $ 0.75