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Other Income and Other Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Regulatory return on capital expenditures | $ 1 |  | $ 17
Return on stranded and security costs | 1 | 3 | 4
All other | 9 | 13 | 11
Total other income | 11 | 16 | 32
Donations | (11) | (11) | (6)
Civic and political expenditures | (17) | (3) | (3)
All other | (5) | (7) | (7)
Total other expense | (33) | (22) | (24)
Consumers Energy Company [Member] |  |  |
Regulatory return on capital expenditures | 1 |  | 17
Return on stranded and security costs | 1 | 3 | 4
All other | 9 | 12 | 10
Total other income | 16 | 19 | 31
Donations | (11) | (11) | (6)
Civic and political expenditures | (17) | (3) | (3)
All other | (5) | (6) | (6)
Total other expense | (33) | (20) | (15)
Investment in CMS Energy common stock [Member] | Consumers Energy Company [Member] |  |  |
Gain on investment | 5 | 4 |
Loss on Reaquired and Extinguished Debt [Member] |  |  |
Gain (Loss) on extinguishment of debt |  | $ (1) | $ (8)

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