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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Amortization of net actuarial loss TAX $ 0 $ 0 $ 0 $ 0
Amortization of prior service credit (TAX BENEFIT) 0 0 0 0
Unrealized loss on investments (TAX BENEFIT) 0 0 0 0
Reclassification adjustments included in net income TAX (TAX BENEFIT) 0 0 0 0
Unrealized loss on derivative instruments (TAX BENEFIT) (1)   (1)  
Unrealized loss on derivative instruments (TAX BENEFIT)   0   0
Consumers Energy Company        
Amortization of net actuarial loss TAX 0 0 0 0
Unrealized loss on investments (TAX BENEFIT) 0 0 0 0
Reclassification adjustments included in net income TAX (TAX BENEFIT) $ 0 $ 0 $ 0 $ 0