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Financings (Revolving Credit Facilities) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Revolving Credit Facilities March 31, 2016 [Member]
  
Amount of Facility $ 550 [1]
Amount Borrowed    [1]
Letters of Credit Outstanding 3 [1]
Amount Available 547 [1]
Average borrowings 20
Weighted average interest rate 2.28%
LIBOR plus 2.00%
Revolving Credit Facilities March 31, 2016 [Member] | Consumers Energy Company [Member]
  
Amount of Facility 500 [2]
Amount Borrowed    [2]
Letters of Credit Outstanding 1 [2]
Amount Available 499 [2]
Revolving Credit Facilities August 9, 2013 [Member] | Consumers Energy Company [Member]
  
Amount of Facility 150 [2],[3]
Amount Borrowed    [2],[3]
Amount Available 150 [2],[3]
Revolving Credit Facilities September 9, 2014 [Member] | Consumers Energy Company [Member]
  
Amount of Facility 30 [2]
Amount Borrowed    [2]
Letters of Credit Outstanding $ 30 [2]
[1] Obligations under this facility are secured by Consumers common stock. CMS Energy's average borrowings during the three months ended March 31, 2012 totaled $20 million, with a weighted-average annual interest rate of 2.28 percent, representing LIBOR plus 2.00 percent.
[2] Obligations under this facility are secured by FMBs of Consumers.
[3] In April 2012, the expiration date was extended to April 2017.