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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 358 $ 161
Restricted cash and cash equivalents 29 27
Accounts receivable and accrued revenue, less allowances 750 869
Notes receivable 25 49
Accounts receivable - related parties 10 10
Inventories at average cost    
Gas in underground storage 610 929
Materials and supplies 96 92
Generating plant fuel stock 182 166
Deferred income taxes 3 24
Deferred property taxes 155 187
Regulatory assets 0 1
Prepayments and other current assets 50 50
Total current assets 2,268 2,565
Plant, Property, and Equipment    
Plant, property, and equipment, gross 14,864 14,751
Less accumulated depreciation and amortization 5,008 4,901
Plant, property, and equipment, net 9,856 9,850
Construction work in progress 899 783
Total plant, property, and equipment 10,755 10,633
Other Non-current Assets    
Regulatory assets, noncurrent 2,362 2,466
Accounts and notes receivable, less allowances 454 462
Investments 53 50
Other 268 276
Total other non-current assets 3,137 3,254
Total Assets 16,160 16,452
Liabilities and Equity    
Current portion of long-term debt, capital and finance lease obligations 837 1,057
Accounts payable 409 575
Accounts payable - related parties 8 9
Accrued rate refunds 34 30
Accrued interest 66 101
Accrued taxes 206 282
Regulatory liabilities 120 125
Other current liabilities 139 159
Total current liabilities 1,819 2,338
Non-current Liabilities    
Long-term debt 6,193 6,040
Non-current portion of capital and finance lease obligations 162 167
Regulatory liabilities 1,919 1,875
Postretirement benefits 1,288 1,289
Asset retirement obligations 257 254
Deferred investment tax credit 45 46
Deferred income taxes 1,056 1,035
Other non-current liabilities 328 336
Total non-current liabilities 11,248 11,042
Commitments and Contingencies (Notes 3, 4, 5, 7, and 8)      
Equity    
Common stock 3 3
Other paid-in capital 4,641 4,627
Accumulated other comprehensive loss (47) (49)
Retained earnings (Accumulated deficit) (1,548) (1,553)
Total common stockholders equity 3,049 3,028
Noncontrolling interests 44 44
Total equity 3,093 3,072
Total Liabilities and Equity 16,160 16,452
Consumers Energy Company [Member]
    
Assets    
Cash and cash equivalents 173 85
Restricted cash and cash equivalents 28 26
Accounts receivable and accrued revenue, less allowances 737 860
Notes receivable 0 23
Accounts receivable - related parties 1 1
Accrued power supply revenue   0
Inventories at average cost    
Gas in underground storage 607 929
Materials and supplies 93 88
Generating plant fuel stock 180 164
Deferred property taxes 155 187
Regulatory assets 0 1
Prepayments and other current assets 42 43
Total current assets 2,016 2,407
Plant, Property, and Equipment    
Plant, property, and equipment, gross 14,733 14,621
Less accumulated depreciation and amortization 4,952 4,846
Plant, property, and equipment, net 9,781 9,775
Construction work in progress 899 782
Total plant, property, and equipment 10,680 10,557
Other Non-current Assets    
Regulatory assets, noncurrent 2,362 2,466
Accounts and notes receivable, less allowances 1 1
Investments 29 35
Other 179 196
Total other non-current assets 2,571 2,698
Total Assets 15,267 15,662
Liabilities and Equity    
Current portion of long-term debt, capital and finance lease obligations 63 363
Accounts payable 396 561
Accounts payable - related parties 11 11
Accrued rate refunds 34 30
Accrued interest 39 73
Accrued taxes 250 287
Deferred income taxes 74 73
Regulatory liabilities 120 125
Other current liabilities 103 119
Total current liabilities 1,090 1,642
Non-current Liabilities    
Long-term debt 3,977 3,987
Non-current portion of capital and finance lease obligations 162 167
Regulatory liabilities 1,919 1,875
Postretirement benefits 1,225 1,225
Asset retirement obligations 257 253
Deferred investment tax credit 45 46
Deferred income taxes 1,835 1,817
Other non-current liabilities 254 256
Total non-current liabilities 9,674 9,626
Commitments and Contingencies (Notes 3, 4, 5, 7, and 8)      
Equity    
Common stock 841 841
Other paid-in capital 3,107 2,957
Accumulated other comprehensive loss (4) (2)
Retained earnings (Accumulated deficit) 515 554
Total common stockholders equity 4,459 4,350
Preferred stock 44 44
Total equity 4,503 4,394
Total Liabilities and Equity $ 15,267 $ 15,662