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Consolidated Statements Of Comprehensive Income (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income $ 149 $ 140 $ 317 $ 376
Income attributable to noncontrolling interests 1 1 2 2
Net income attributable to CMS Energy 148 139 315 374
Retirement benefits liability adjustments, net of tax 1   3 1
Unrealized gain (loss) on investments, net of tax 1 (2) 3 (1)
Other Comprehensive Income 2 (2) 6  
Total Comprehensive Income 150 137 321 374
Consumers Energy Company [Member]
       
Net income 163 155 361 400
Retirement benefits liability adjustments, net of tax 1   2 1
Unrealized gain (loss) on investments, net of tax       (1)
Other Comprehensive Income 1   2  
Total Comprehensive Income $ 164 $ 155 $ 363 $ 400