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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, current $ 603 $ 774
Other liabilities current 127 142
Current portion of long-term debt 897 684
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] 21  
Notes receivable, Fair Value [2] 1,245 1,161
Securities held to maturity - Fair Value 13 11
Long-term debt, Fair Value [3] 9,383 9,084
Long-term payables, Fair Value [4] 21 14
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [1] 21  
Notes receivable, Fair Value [2] 1,336 1,228
Securities held to maturity - Fair Value 13 11
Long-term debt, Fair Value [3] 10,394 9,599
Long-term payables, Fair Value [4] 22 14
Consumers Energy Company [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, current 585 758
Other liabilities current 93 109
Current portion of long-term debt 448 198
Consumers Energy Company [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [5] 21  
Notes receivable, Fair Value 44  
Long-term debt, Fair Value [6] 5,370 5,381
Long-term payables, Fair Value 7  
Consumers Energy Company [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term receivable, fair Value [5] 21  
Notes receivable, Fair Value 44  
Long-term debt, Fair Value [6] 6,019 5,684
Long-term payables, Fair Value 7  
EnerBank [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current notes receivable 157 144
Other Receivables [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, current 12  
Other Receivables [Member] | Consumers Energy Company [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, current 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 [5]
Notes receivable, Fair Value
Long-term debt, Fair Value [6]
Long-term payables, Fair Value
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 13 11
Long-term debt, Fair Value [3] 9,324 8,648
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] 4,949 4,733
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] 21  
Notes receivable, Fair Value [2] 1,336 1,228
Long-term debt, Fair Value [3] 1,070 951
Long-term payables, Fair Value [4] 22 14
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 [5] 21  
Notes receivable, Fair Value 44  
Long-term debt, Fair Value [6] 1,070 $ 951
Long-term payables, Fair Value $ 7  
[1] Includes current accounts receivable of $12 million at June 30, 2016.
[2] Includes current portion of notes receivable of $157 million at June 30, 2016 and $144 million at December 31, 2015.
[3] Includes current portion of long-term debt of $897 million at June 30, 2016 and $684 million at December 31, 2015.
[4] Includes current portion of long-term payables of $1 million at June 30, 2016 and December 31, 2015.
[5] Includes current accounts receivable of $12 million at June 30, 2016.
[6] Includes current portion of long-term debt of $448 million at June 30, 2016 and $198 million at December 31, 2015.