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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current Assets    
Cash and cash equivalents $ 586 $ 93
Restricted cash and cash equivalents 29 29
Accounts receivable and accrued revenue, less allowances 914 855
Notes receivable 73 41
Accounts receivable - related parties 10 10
Accrued power supply and gas revenue 28 32
Inventories at average cost    
Gas in underground storage 389 820
Materials and supplies 99 96
Generating plant fuel stock 149 168
Deferred property taxes 157 190
Regulatory assets 38 35
Prepayments and other current assets 56 53
Total current assets 2,528 2,422
Plant, Property, and Equipment    
Plant, property, and equipment, gross 15,732 15,592
Less accumulated depreciation and amortization 5,200 5,121
Plant, property, and equipment, net 10,532 10,471
Construction work in progress 1,135 1,080
Total plant, property, and equipment 11,667 11,551
Other Non-current Assets    
Regulatory assets, noncurrent 2,223 2,287
Accounts and notes receivable, less allowances 508 521
Investments 60 57
Other 283 293
Total other non-current assets 3,074 3,158
Total Assets 17,269 17,131
Current Liabilities    
Current portion of long-term debt, capital and finance lease obligations 732 541
Notes payable   110
Accounts payable 426 512
Accounts payable - related parties 10 9
Accrued rate refunds 1 6
Accrued interest 68 95
Accrued taxes 211 279
Deferred income taxes 49 68
Regulatory liabilities, current 14 25
Other current liabilities 134 152
Total current liabilities 1,645 1,797
Non-current Liabilities    
Long-term debt 6,741 6,710
Non-current portion of capital and finance lease obligations 149 153
Regulatory liabilities 2,219 2,101
Postretirement benefits 1,398 1,451
Asset retirement obligations 316 312
Deferred investment tax credit 42 43
Deferred income taxes 1,098 1,015
Other non-current liabilities 311 311
Total non-current liabilities 12,274 12,096
Commitments and Contingencies (Notes 1 and 2)      
Equity    
Common stock 3 3
Other paid-in capital 4,703 4,669
Accumulated other comprehensive loss (54) (55)
Retained earnings (Accumulated deficit) (1,346) (1,423)
Total common stockholders equity 3,306 3,194
Noncontrolling interests 44 44
Total equity 3,350 3,238
Total Liabilities and Equity 17,269 17,131
Consumers Energy Company [Member]
   
Current Assets    
Cash and cash equivalents 355 5
Restricted cash and cash equivalents 28 28
Accounts receivable and accrued revenue, less allowances 901 844
Notes receivable 25  
Accounts receivable - related parties 2 1
Accrued power supply and gas revenue 28 32
Inventories at average cost    
Gas in underground storage 389 816
Materials and supplies 95 92
Generating plant fuel stock 148 167
Deferred property taxes 157 190
Regulatory assets 38 35
Prepayments and other current assets 50 45
Total current assets 2,216 2,255
Plant, Property, and Equipment    
Plant, property, and equipment, gross 15,596 15,456
Less accumulated depreciation and amortization 5,139 5,061
Plant, property, and equipment, net 10,457 10,395
Construction work in progress 1,134 1,080
Total plant, property, and equipment 11,591 11,475
Other Non-current Assets    
Regulatory assets, noncurrent 2,223 2,287
Accounts and notes receivable, less allowances 14 17
Investments 30 32
Other 198 209
Total other non-current assets 2,465 2,545
Total Assets 16,272 16,275
Current Liabilities    
Current portion of long-term debt, capital and finance lease obligations 262 63
Notes payable   110
Accounts payable 414 501
Accounts payable - related parties 14 11
Accrued rate refunds 1 6
Accrued interest 37 65
Accrued taxes 329 376
Deferred income taxes 118 144
Regulatory liabilities, current 14 25
Other current liabilities 97 109
Total current liabilities 1,286 1,410
Non-current Liabilities    
Long-term debt 4,086 4,297
Non-current portion of capital and finance lease obligations 149 153
Regulatory liabilities 2,219 2,101
Postretirement benefits 1,334 1,385
Asset retirement obligations 315 311
Deferred investment tax credit 42 43
Deferred income taxes 1,785 1,741
Other non-current liabilities 253 252
Total non-current liabilities 10,183 10,283
Commitments and Contingencies (Notes 1 and 2)      
Equity    
Common stock 841 841
Other paid-in capital 3,257 3,107
Accumulated other comprehensive loss (6) (8)
Retained earnings (Accumulated deficit) 667 598
Total common stockholders equity 4,759 4,538
Preferred stock 44 44
Total equity 4,803 4,582
Total Liabilities and Equity $ 16,272 $ 16,275