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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Allowance for doubtful accounts receivable | $ 20 | $ 20
Allowances for doubtful notes receivable | $ 24 | $ 20
Common stock authorized (in shares) | 350,000,000 | 350,000,000
Common stock outstanding (in shares) | 283,400,000 | 281,600,000
Consumers Energy Company |  |
Allowance for doubtful accounts receivable | $ 20 | $ 20
Common stock authorized (in shares) | 125,000,000 | 125,000,000
Common stock outstanding (in shares) | 84,100,000 | 84,100,000

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