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Other Income and Other Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Regulatory return on capital expenditures |  | $ 17 | $ 26
Gain on investment |  |  | 8
Return on stranded and security costs | 3 | 4 | 5
All other | 13 | 11 | 13
Total other income | 16 | 32 | 80
Donations | (11) | (6) |
Civic and political expenditures | (3) | (3) | (3)
All other | (7) | (7) | (9)
Total other expense | (22) | (24) | (30)
Consumers Energy Company [Member] |  |  |
Regulatory return on capital expenditures |  | 17 | 26
Gain on investment |  |  | 5
Return on stranded and security costs | 3 | 4 | 5
All other | 12 | 10 | 11
Total other income | 19 | 31 | 47
Donations | (11) | (6) |
Civic and political expenditures | (3) | (3) | (3)
All other | (6) | (6) | (8)
Total other expense | (20) | (15) | (11)
Gain on Early Retirement of Long-term Debt [Member] |  |  |
Gain (Loss) on extinguishment of debt |  |  | 28
Loss on Reaquired and Extinguished Debt [Member] |  |  |
Gain (Loss) on extinguishment of debt | (1) | (8) | (18)
Investment in CMS Energy common stock [Member] | Consumers Energy Company [Member] |  |  |
Gain on investment | 4 |  |
Supplemental Executive Retirement Plan [Member] | Consumers Energy Company [Member] |  |  |
Gain on investment |  |  | $ 5

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