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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and accrued interest receivable $ 197 $ 180
Other liabilities current 130 199
Current portion of long-term debt 959 864
DIG Note Payable [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other liabilities current 1 1
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 22 22
Notes receivable, Fair Value [2] 1,382 1,326
Securities held to maturity - Fair Value 16 13
Long-term debt, Fair Value [3] 9,983 9,504
Long-term payables, Fair Value [4] 18 17
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 22 22
Notes receivable, Fair Value [2] 1,479 1,415
Securities held to maturity - Fair Value 16 13
Long-term debt, Fair Value [3] 10,484 9,953
Long-term payables, Fair Value [4] 18 17
Consumers Energy Company [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and accrued interest receivable 30 29
Other liabilities current 93 164
Current portion of long-term debt 443 375
Consumers Energy Company [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 22 22
Notes receivable, Fair Value [5] 46 45
Long-term debt, Fair Value [6] 5,718 5,628
Consumers Energy Company [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 22 22
Notes receivable, Fair Value [5] 46 45
Long-term debt, Fair Value [6] 6,032 5,903
EnerBank [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current notes receivable 228 219
Other Receivables [Member] | Consumers Energy Company [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, current 14 12
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1]
Notes receivable, Fair Value [2]
Securities held to maturity - Fair Value
Long-term debt, Fair Value [3]
Long-term payables, Fair Value [4]
Fair Value, Inputs, Level 1 [Member] | Consumers Energy Company [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1]
Notes receivable, Fair Value [5]
Long-term debt, Fair Value [6]
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities held to maturity - Fair Value 16 13
Long-term debt, Fair Value [3] 9,331 8,990
Fair Value, Inputs, Level 2 [Member] | Consumers Energy Company [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value [6] 4,879 4,940
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 22 22
Notes receivable, Fair Value [2] 1,479 1,415
Long-term debt, Fair Value [3] 1,153 963
Long-term payables, Fair Value [4] 18 17
Fair Value, Inputs, Level 3 [Member] | Consumers Energy Company [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 22 22
Notes receivable, Fair Value [5] 46 45
Long-term debt, Fair Value [6] $ 1,153 $ 963
[1] Includes current accounts receivable of $14 million at September 30, 2017 and $12 million at December 31, 2016.
[2] Includes current portion of notes receivable of $228 million at September 30, 2017 and $219 million at December 31, 2016.
[3] Includes current portion of long-term debt of $959 million at September 30, 2017 and $864 million at December 31, 2016.
[4] Includes current portion of long-term payables of $1 million at September 30, 2017 and December 31, 2016.
[5] Includes current portion of notes receivable of $30 million at September 30, 2017 and $29 million at December 31, 2016.
[6] Includes current portion of long-term debt of $443 million at September 30, 2017 and $375 million at December 31, 2016.