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Consolidated Statement of Income (Loss) and Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating Revenues:        
Operating Revenues $ 2,699 $ 2,173 $ 7,017 $ 5,682
Operating Expenses:        
Fuel and purchased power 768 499 2,064 1,154
Natural gas purchased for resale 25 30 233 214
Other operations and maintenance 502 520 1,447 1,455
Depreciation and amortization 415 388 1,168 1,125
Taxes other than income taxes 164 150 439 416
Total operating expenses 1,874 1,587 5,351 4,364
Operating Income 825 586 1,666 1,318
Other Income, Net 76 101 257 293
Interest Charges 208 173 570 492
Income Before Income Taxes 693 514 1,353 1,119
Income Taxes 52 57 145 140
Net Income 641 457 1,208 979
Less: Net Income Attributable to Noncontrolling Interests 1 1 4 4
Preferred Stock Dividends 1 1 4 4
Net income attributable to Ameren common shareholders 640 456 1,204 975
Pension and other postretirement benefit plan activity, net of income taxes (benefit) 0 (1) (2) (4)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax 0 0 (6) 0
Comprehensive Income 641 456 1,200 975
Less: Comprehensive Income Attributable to Noncontrolling Interests 1 1 4 4
Comprehensive Income Attributable to Ameren Common Shareholders $ 640 $ 455 $ 1,196 $ 971
Earnings per Common Share - Basic $ 2.37 $ 1.71 $ 4.46 $ 3.66
Earnings per Common Share - Basic $ 2.35 $ 1.70 $ 4.43 $ 3.65
Weighted-average Common Shares Outstanding – Basic 270.4 266.8 270.2 266.6
Weighted-average Common Shares Outstanding – Diluted 272.2 267.3 271.7 266.9
Electric        
Operating Revenues:        
Operating Revenues $ 2,563 $ 2,035 $ 6,223 $ 4,920
Natural gas        
Operating Revenues:        
Operating Revenues 136 138 794 762
Union Electric Company        
Operating Revenues:        
Operating Revenues 1,705 1,342 4,002 3,005
Operating Expenses:        
Fuel and purchased power 487 334 1,431 689
Natural gas purchased for resale 6 4 45 41
Other operations and maintenance 260 288 748 789
Depreciation and amortization 239 220 642 623
Taxes other than income taxes 122 109 300 287
Total operating expenses 1,114 955 3,166 2,429
Operating Income 591 387 836 576
Other Income, Net 45 51 135 144
Interest Charges 85 62 215 187
Income Before Income Taxes 551 376 756 533
Income Taxes 32 (6) 43 (4)
Net Income 519 382 713 537
Preferred Stock Dividends 1 1 3 3
Net income attributable to Ameren common shareholders 518 381 710 534
Union Electric Company | Electric        
Operating Revenues:        
Operating Revenues 1,685 1,324 3,893 2,902
Union Electric Company | Natural gas        
Operating Revenues:        
Operating Revenues 20 18 109 103
Ameren Illinois Company        
Operating Revenues:        
Operating Revenues 946 793 2,889 2,559
Operating Expenses:        
Purchased Power 284 169 642 474
Natural gas purchased for resale 19 26 188 173
Other operations and maintenance 241 229 702 663
Depreciation and amortization 162 155 484 462
Taxes other than income taxes 38 37 126 116
Total operating expenses 744 616 2,142 1,888
Operating Income 202 177 747 671
Other Income, Net 30 37 101 105
Interest Charges 67 63 192 178
Income Before Income Taxes 165 151 656 598
Income Taxes 17 37 134 144
Net Income 148 114 522 454
Preferred Stock Dividends 0 0 1 1
Net income attributable to Ameren common shareholders 148 114 521 453
Ameren Illinois Company | Electric        
Operating Revenues:        
Operating Revenues 829 672 2,203 1,899
Ameren Illinois Company | Natural gas        
Operating Revenues:        
Operating Revenues $ 117 $ 121 $ 686 $ 660