v3.26.1
Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Accounts Receivable, Allowance for Credit Loss, Current $ 45 $ 39
Regulatory Asset 2,888 2,524
Current maturities of long-term debt 1,524 973
Long-term debt, net $ 19,064 $ 18,214
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 276,800,000 276,400,000
Common Stock, Shares, Issued 276,800,000 276,400,000
Variable Interest Entity, Primary Beneficiary    
Regulatory Asset $ 432 $ 443
Current maturities of long-term debt 24 23
Long-term debt, net 414 426
Union Electric Company    
Accounts Receivable, Allowance for Credit Loss, Current 17 17
Regulatory Asset 1,529 1,450
Current maturities of long-term debt $ 424 $ 23
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
Union Electric Company | Variable Interest Entity, Primary Beneficiary    
Regulatory Asset $ 432 $ 443
Current maturities of long-term debt 24 23
Long-term debt, net 414 426
Ameren Illinois Company    
Accounts Receivable, Allowance for Credit Loss, Current 28 22
Regulatory Asset $ 1,338 $ 1,059
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