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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Assets    
Securities held to maturity $ 26 $ 21
Liabilities    
EnerBank notes receivable, net of allowance for loan losses 249 233
Other current liabilities 3 1
Long-term debt, current 1,100 1,000
Carrying Amount    
Assets    
Long-term receivables 20 22
Notes receivable 2,231 1,857
Securities held to maturity 26 22
Liabilities    
Long-term debt 12,292 11,589
Long-term payables 28 27
Fair Value    
Assets    
Long-term receivables 20 22
Notes receivable 2,359 1,967
Securities held to maturity 26 21
Liabilities    
Long-term debt 13,112 11,630
Long-term payables 29 27
Consumers Energy Company    
Liabilities    
Long-term debt, current 26 26
Current portion notes receivable related party 7 7
Consumers Energy Company | Carrying Amount    
Assets    
Long-term receivables 20 22
Notes receivable related party 105 106
Liabilities    
Long-term debt 6,572 6,805
Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 20 22
Notes receivable related party 105 106
Liabilities    
Long-term debt 7,102 6,833
EnerBank    
Liabilities    
EnerBank notes receivable, net of allowance for loan losses 249 233
Other Receivables | Consumers Energy Company    
Liabilities    
Accounts receivable, current 14 14
Fair Value, Inputs, Level 1 | Fair Value    
Assets    
Long-term receivables 0 0
Notes receivable 0 0
Securities held to maturity 0 0
Liabilities    
Long-term debt 1,177 459
Long-term payables 0 0
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 0 0
Notes receivable related party 0 0
Liabilities    
Long-term debt 0 0
Fair Value, Inputs, Level 2 | Fair Value    
Assets    
Long-term receivables 0 0
Notes receivable 0 0
Securities held to maturity 26 21
Liabilities    
Long-term debt 10,053 9,404
Long-term payables 0 0
Fair Value, Inputs, Level 2 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 0 0
Notes receivable related party 0 0
Liabilities    
Long-term debt 5,220 5,066
Fair Value, Inputs, Level 3 | Fair Value    
Assets    
Long-term receivables 20 22
Notes receivable 2,359 1,967
Securities held to maturity 0 0
Liabilities    
Long-term debt 1,882 1,767
Long-term payables 29 27
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables 20 22
Notes receivable related party 105 106
Liabilities    
Long-term debt $ 1,882 $ 1,767