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Schedule I - Condensed Financial Information Of Parent (Balance Sheet) (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets:        
Cash and cash equivalents $ 13 $ 7    
Advances to money pool 107 96    
Accounts receivable - affiliates 665 525    
Miscellaneous accounts receivable 107 96    
Total current assets 2,571 2,264    
Other assets 1,154 1,123    
Total assets 48,476 44,598    
Liabilities and Shareholders' Equity:        
Long-Term Debt, Current Maturities 973 317    
Short-term debt 643 1,143    
Accounts and wages payable 1,254 1,059    
Other current liabilities 570 475    
Total current liabilities 3,907 3,413    
Long-term debt, net 18,214 17,262    
Other deferred credits and liabilities 540 487    
Commitments and Contingencies (Note 4)    
Common stock, $.01 par value, 400.0 shares authorized – shares outstanding of 276.4 and 269.9, respectively 3 3    
Other paid-in capital, principally premium on common stock 8,106 7,513    
Retained earnings 5,292 4,604    
Accumulated other comprehensive loss 0 (6)    
Total shareholders’ equity 13,530 12,243 $ 11,478  
TOTAL LIABILITIES AND EQUITY $ 48,476 $ 44,598    
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01    
Common stock, shares authorized 400,000,000.0 400,000,000.0    
Common Stock, Shares, Outstanding 276,400,000 269,900,000 266,300,000 262,000,000.0
Ameren (parent)        
Assets:        
Cash and cash equivalents $ 0 $ 0    
Derivative Asset, Current 8 3    
Total current assets 228 182    
Investments in subsidiaries 17,360 16,262    
Debt Securities, Noncurrent 69 44    
Accumulated deferred income taxes, net 85 98    
Other assets 114 155    
Total assets 17,856 16,741    
Liabilities and Shareholders' Equity:        
Long-Term Debt, Current Maturities 950 0    
Short-term debt 155 1,055    
Taxes accrued 6 7    
Other current liabilities 66 54    
Total current liabilities 1,201 1,165    
Long-term debt, net 3,181 3,383    
Pension and other postretirement benefits 19 18    
Other deferred credits and liabilities 71 73    
Total liabilities 4,472 4,639    
Commitments and Contingencies (Note 4)    
Common stock, $.01 par value, 400.0 shares authorized – shares outstanding of 276.4 and 269.9, respectively 3 3    
Other paid-in capital, principally premium on common stock 8,106 7,513    
Retained earnings 5,275 4,592    
Accumulated other comprehensive loss 0 (6)    
Total shareholders’ equity 13,384 12,102    
TOTAL LIABILITIES AND EQUITY $ 17,856 $ 16,741    
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01    
Common stock, shares authorized 400,000,000.0 400,000,000.0    
Common Stock, Shares, Outstanding 276,400,000 269,900,000    
Ameren (parent) | Related Party        
Assets:        
Advances to money pool $ 177 $ 103    
Accounts receivable - affiliates 11 41    
Miscellaneous accounts receivable 177 103    
Liabilities and Shareholders' Equity:        
Accounts and wages payable 24 49    
Ameren (parent) | Nonrelated Party        
Assets:        
Advances to money pool 32 35    
Miscellaneous accounts receivable $ 32 $ 35