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Consolidated Statement Of Income (Loss) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Revenues:      
Operating revenues $ 8,799 $ 7,623 $ 7,500
Operating Expenses:      
Utilities Operating Expense, Fuel Used and Purchased Power 2,306 1,681 1,812
Natural gas purchased for resale 348 320 355
Other operations and maintenance 1,974 1,969 1,866
Depreciation and amortization 1,568 1,590 1,387
Taxes other than income taxes 577 547 522
Total operating expenses 6,773 6,107 5,942
Operating Income 2,026 1,516 1,558
Other Income, Net 347 417 348
Interest Charges 776 663 566
Income Before Income Taxes 1,597 1,270 1,340
Income Taxes 136 83 183
Net Income 1,461 1,187 1,157
Less: Net Income Attributable to Noncontrolling Interests 5 5 5
Net Income Attributable to Ameren Common Shareholders 1,456 1,182 1,152
Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $1, $—, and $(2), respectively 3 (3) (5)
Unrealized net gain on derivative hedging instruments, net of income taxes of $2, $—, and $—, respectively 3 3 0
Comprehensive Income 1,467 1,187 1,152
Less: Comprehensive Income Attributable to Noncontrolling Interests 5 5 5
Comprehensive Income Attributable to Ameren Common Shareholders 1,462 1,182 1,147
Preferred Stock Dividends $ 5 $ 5 $ 5
Earnings per Common Share – Basic      
Earnings per Common Share – Basic $ 5.38 $ 4.43 $ 4.39
Earnings per Common Share – Diluted      
Earnings per Common Share – Diluted $ 5.35 $ 4.42 $ 4.38
Weighted-average Common Shares Outstanding – Basic 270.5 266.8 262.8
Weighted-average Common Shares Outstanding – Diluted 272.2 267.4 263.4
Ameren Missouri      
Operating Revenues:      
Operating revenues $ 4,795 $ 3,993 $ 3,859
Operating Expenses:      
Utilities Operating Expense, Fuel Used and Purchased Power 1,538 1,071 997
Natural gas purchased for resale 65 60 79
Other operations and maintenance 1,029 1,050 1,003
Depreciation and amortization 860 917 783
Taxes other than income taxes 393 372 360
Total operating expenses 3,885 3,470 3,222
Operating Income 910 523 637
Other Income, Net 180 196 130
Interest Charges 297 244 227
Income Before Income Taxes 793 475 540
Income Taxes 43 (87) (8)
Net Income 750 562 548
Net Income Attributable to Ameren Common Shareholders 747 559 545
Preferred Stock Dividends 3 3 3
Ameren Illinois      
Operating Revenues:      
Operating revenues 3,844 3,472 3,482
Operating Expenses:      
Purchased power 781 621 820
Natural gas purchased for resale 283 260 276
Other operations and maintenance 945 906 818
Depreciation and amortization 652 619 556
Taxes other than income taxes 169 157 146
Total operating expenses 2,830 2,563 2,616
Operating Income 1,014 909 866
Other Income, Net 136 147 156
Interest Charges 260 241 204
Income Before Income Taxes 890 815 818
Income Taxes 153 193 209
Net Income 737 622 609
Net Income Attributable to Ameren Common Shareholders 735 620 607
Preferred Stock Dividends 2 2 2
Electric      
Operating Revenues:      
Operating revenues 7,668 6,540 6,439
Electric | Ameren Missouri      
Operating Revenues:      
Operating revenues 4,631 3,847 3,694
Electric | Ameren Illinois      
Operating Revenues:      
Operating revenues 2,876 2,534 2,585
Natural gas      
Operating Revenues:      
Operating revenues 1,131 1,083 1,061
Natural gas | Ameren Missouri      
Operating Revenues:      
Operating revenues 164 146 165
Natural gas | Ameren Illinois      
Operating Revenues:      
Operating revenues $ 968 $ 938 $ 897