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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets    
Securities held to maturity $ 21 $ 16
Liabilities    
Other current liabilities 134 195
Long-term debt, current 1,900 1,100
Current portion of notes receivable 237 198
DIG Note Payable    
Liabilities    
Other current liabilities 3 3
Carrying Amount    
Assets    
Long-term receivables 22 21 [1]
Notes receivable [2] 1,640 1,371
Securities held to maturity 22 16
Liabilities    
Long-term debt [3] 10,817 10,204
Long-term payables [4] 26 27
Fair Value    
Assets    
Long-term receivables [1] 22 21
Notes receivable [2] 1,730 1,464
Securities held to maturity 21 16
Liabilities    
Long-term debt [3] 10,798 10,715
Long-term payables [4] 26 26
Consumers Energy Company    
Liabilities    
Other current liabilities 96 159
Long-term debt, current 876 343
Current portion of notes receivable 17 17
Current portion notes receivable related party 7 0
Consumers Energy Company | Carrying Amount    
Assets    
Long-term receivables [1] 22 21
Notes receivable [5] 17 17
Notes Receivable Affiliate, Fair Value Disclosure [6] 107 0
Liabilities    
Long-term debt [7] 6,115 5,904
Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [1] 22 21
Notes receivable [5] 17 17
Notes Receivable Affiliate, Fair Value Disclosure [6] 105 0
Liabilities    
Long-term debt [7] 6,083 6,236
EnerBank    
Liabilities    
Current notes receivable 263 200
Other Receivables | Consumers Energy Company    
Liabilities    
Accounts receivable, current 15 14
Fair Value, Inputs, Level 1 | Fair Value    
Assets    
Long-term receivables [1] 0 0
Notes receivable [2] 0 0
Securities held to maturity 0 0
Liabilities    
Long-term debt [3] 445 0
Long-term payables [4] 0 0
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [1] 0 0
Notes receivable [5] 0 0
Notes Receivable Affiliate, Fair Value Disclosure [6] 0 0
Liabilities    
Long-term debt [7] 0 0
Fair Value, Inputs, Level 2 | Fair Value    
Assets    
Long-term receivables [1] 0 0
Notes receivable [2] 0 0
Securities held to maturity 21 16
Liabilities    
Long-term debt [3] 9,088 9,363
Long-term payables [4] 0 0
Fair Value, Inputs, Level 2 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [1] 0 0
Notes receivable [5] 0 0
Notes Receivable Affiliate, Fair Value Disclosure [6] 0 0
Liabilities    
Long-term debt [7] 4,818 4,883
Fair Value, Inputs, Level 3 | Fair Value    
Assets    
Long-term receivables [1] 22 21
Notes receivable [2] 1,730 1,464
Securities held to maturity 0 0
Liabilities    
Long-term debt [3] 1,265 1,352
Long-term payables [4] 26 26
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value    
Assets    
Long-term receivables [1] 22 21
Notes receivable [5] 17 17
Notes Receivable Affiliate, Fair Value Disclosure [6] 105 0
Liabilities    
Long-term debt [7] 1,265 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 accounts receivable of $15 million at September 30, 2018 and $14 million December 31, 2017.
[2] Includes current portion of notes receivable of $263 million at September 30, 2018 and $200 million at December 31, 2017. For further details, see Note 7, Notes Receivable.
[3] Includes current portion of long-term debt of $1.9 billion at September 30, 2018 and $1.1 billion at December 31, 2017.
[4] Includes current portion of long-term payables of $3 million at September 30, 2018 and December 31, 2017.
[5] Includes current portion of notes receivable of $17 million at September 30, 2018 and December 31, 2017.
[6] Includes current portion of notes receivable – related party of $7 million at September 30, 2018. For further details on this note receivable, see the DB SERP discussion below.
[7] Includes current portion of long-term debt of $876 million at September 30, 2018 and $343 million at December 31, 2017.