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Consolidated Balance Sheet - UE (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Accounts receivable - trade, allowance for doubtful accounts $ 39 $ 30
Regulatory Asset, Noncurrent 2,524 2,397
Long-Term Debt, Current Maturities 973 317
Long-Term Debt, Excluding Current Maturities $ 18,214 $ 17,262
Common stock, shares authorized 400,000,000.0 400,000,000.0
Common Stock, Shares, Outstanding 276,400,000 269,900,000
Variable Interest Entity, Primary Beneficiary    
Regulatory Asset, Noncurrent $ 443 $ 465
Long-Term Debt, Current Maturities 23 17
Long-Term Debt, Excluding Current Maturities 426 448
Ameren Missouri    
Accounts receivable - trade, allowance for doubtful accounts 17 12
Regulatory Asset, Noncurrent 1,450 1,366
Long-Term Debt, Current Maturities 23 17
Long-Term Debt, Excluding Current Maturities $ 8,120 7,671
Common Stock, No Par Value (in dollars per share) $ 5  
Common stock, shares authorized 150,000,000.0  
Common Stock, Shares, Outstanding 102,100,000  
Ameren Missouri | Variable Interest Entity, Primary Beneficiary    
Regulatory Asset, Noncurrent $ 443 465
Long-Term Debt, Current Maturities 23 17
Long-Term Debt, Excluding Current Maturities $ 426 $ 448