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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Allowances for doubtful accounts receivable | $ 31 | $ 32
Allowances for doubtful notes receivable | 5 | 5
Common stock, shares authorized | 350,000,000 | 350,000,000
Common stock, shares outstanding | 266,000,000 | 264,100,000
Consumers Energy Company [Member] |  |
Allowances for doubtful accounts receivable | $ 29 | $ 30
Common stock, shares authorized | 125,000,000 | 125,000,000
Common stock, shares outstanding | 84,100,000 | 84,100,000

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