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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable and accrued revenue ALLOWANCE | $ 20 | $ 20
Accounts and notes receivable ALLOWANCE | $ 23 | $ 20
Common Stock, Shares Authorized (in shares) | 350.0 | 350.0
Common Stock, Shares, Outstanding | 283.2 | 281.6
Consumers Energy Company |  |
Accounts receivable and accrued revenue ALLOWANCE | $ 20 | $ 20
Common Stock, Shares Authorized (in shares) | 125.0 | 125.0
Common Stock, Shares, Outstanding | 84.1 | 84.1

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- Definition A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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