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Other Income and Other Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fee income $ 9 $ 8 $ 7
All other 1 3 3
Total other income 10 11 10
Civic and political expenditures (10) (14) (5)
Donations (1) (15) (4)
Loss on reacquired and extinguished debt   (20) (4)
All other (6) (6) (7)
Total other expense (17) (55) (20)
Consumers Energy Company [Member]      
Fee income 9 8 7
Gain on CMS Energy common stock 9   4
All other 1 2 3
Total other income 19 10 14
Civic and political expenditures (10) (14) (5)
Donations (1) (15) (4)
All other (6) (6) (7)
Total other expense $ (17) $ (35) $ (16)