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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Assets    
Securities held to maturity $ 19 $ 16
Liabilities    
Long-term debt, current 1,200 1,100
Other current liabilities 117 195
Current portion of notes receivable 206 198
DIG Note Payable    
Liabilities    
Other current liabilities 3 3
Carrying Amount    
Assets    
Long-term receivables 21 21
Notes receivable 1,437 1,371
Securities held to maturity 19 16
Liabilities    
Long-term debt [1] 10,466 10,204
Long-term payables [2] 26 27
Fair Value    
Assets    
Long-term receivables [3] 21 21
Notes receivable [4] 1,522 1,464
Securities held to maturity 19 16
Liabilities    
Long-term debt [1] 10,539 10,715
Long-term payables [2] 26 26
Consumers Energy Company    
Liabilities    
Long-term debt, current 376 343
Other current liabilities 84 159
Current portion of notes receivable 17 17
Consumers Energy Company | Carrying Amount    
Assets    
Long-term receivables [3] 21 21
Notes receivable 17 17
Liabilities    
Long-term debt [5] 6,114 5,904
Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [3] 21 21
Notes receivable [6] 17 17
Liabilities    
Long-term debt [5] 6,163 6,236
EnerBank    
Liabilities    
Current notes receivable 206 200
Other Receivables | Consumers Energy Company    
Liabilities    
Accounts receivable, current 14 14
Fair Value, Inputs, Level 1 | Fair Value    
Assets    
Long-term receivables [3] 0 0
Notes receivable [4] 0 0
Securities held to maturity 0 0
Liabilities    
Long-term debt [1] 199 0
Long-term payables [2] 0 0
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [3] 0 0
Notes receivable [6] 0 0
Liabilities    
Long-term debt [5] 0 0
Fair Value, Inputs, Level 2 | Fair Value    
Assets    
Long-term receivables [3] 0 0
Notes receivable [4] 0 0
Securities held to maturity 19 16
Liabilities    
Long-term debt [1] 9,053 9,363
Long-term payables [2] 0 0
Fair Value, Inputs, Level 2 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [3] 0 0
Notes receivable [6] 0 0
Liabilities    
Long-term debt [5] 4,876 4,883
Fair Value, Inputs, Level 3 | Fair Value    
Assets    
Long-term receivables [3] 21 21
Notes receivable [4] 1,522 1,464
Securities held to maturity 0 0
Liabilities    
Long-term debt [1] 1,287 1,352
Long-term payables [2] 26 26
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [3] 21 21
Notes receivable [6] 17 17
Liabilities    
Long-term debt [5] 1,287 1,353
Michigan tax settlement    
Liabilities    
Current portion of notes receivable 20 20
Michigan tax settlement | Consumers Energy Company    
Liabilities    
Current portion of notes receivable $ 17 $ 17
[1] Includes current portion of long-term debt of $1.2 billion at June 30, 2018 and $1.1 billion at December 31, 2017.
[2] Includes current portion of long-term payables of $3 million at June 30, 2018 and December 31, 2017.
[3] Includes current accounts receivable of $14 million at June 30, 2018 and December 31, 2017.
[4] Includes current portion of notes receivable of $206 million at June 30, 2018 and $200 million at December 31, 2017.
[5] Includes current portion of long-term debt of $376 million at June 30, 2018 and $343 million at December 31, 2017.
[6] Includes current portion of notes receivable of $17 million at June 30, 2018 and December 31, 2017.