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Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts Receivable, Allowance for Credit Loss, Current | $ 30 | $ 29
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 400,000,000.0 | 400,000,000.0
Common Stock, Shares, Outstanding | 258,400,000 | 257,700,000
Union Electric Company |  |
Accounts Receivable, Allowance for Credit Loss, Current | $ 12 | $ 13
Common stock, par value (in dollars per share) | $ 5 | $ 5
Common stock, shares authorized (in shares) | 150,000,000.0 | 150,000,000.0
Common Stock, Shares, Outstanding | 102,100,000 | 102,100,000
Ameren Illinois Company |  |
Accounts Receivable, Allowance for Credit Loss, Current | $ 18 | $ 16
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 45,000,000.0 | 45,000,000.0
Common Stock, Shares, Outstanding | 25,500,000 | 25,500,000

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