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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Allowances for doubtful accounts receivable | $ 37 | $ 40
Allowances for doubtful notes receivable | $ 8 | $ 8
Common stock, shares authorized | 350,000,000 | 350,000,000
Common stock, shares outstanding | 276,700,000 | 275,200,000
Consumers Energy Company [Member] |  |
Allowances for doubtful accounts receivable | $ 36 | $ 39
Common stock, shares authorized | 125,000,000 | 125,000,000
Common stock, shares outstanding | 84,100,000 | 84,100,000

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