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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net Income $ 172 $ 186 $ 464 $ 475
Retirement Benefits Liability        
Amortization of net actuarial loss, net of tax   1 1 2
Amortization of prior service credit, net of tax       (1)
Investments        
Unrealized gain (loss) on investments, net of tax 1 1 2 1
Other Comprehensive Income (Loss) 1 2 3 2
Comprehensive Income 173 188 467 477
Comprehensive Income Attributable to Noncontrolling Interest     1 1
Comprehensive Income Attributable to CMS Energy 173 188 466 476
Consumers Energy Company [Member]        
Net Income 181 195 496 499
Retirement Benefits Liability        
Amortization of net actuarial loss, net of tax     1  
Investments        
Unrealized gain (loss) on investments, net of tax   (2) 2 3
Reclassification adjustments included in net income, net of tax     (8)  
Other Comprehensive Income (Loss)   (2) (5) 3
Comprehensive Income Attributable to CMS Energy $ 181 $ 193 $ 491 $ 502