| Three Months Ended March 31, | |||||||||||
| 2023 | 2022 | ||||||||||
| Operating Revenues: | |||||||||||
| Electric | $ | 1,590 | $ | 1,318 | |||||||
| Natural gas | 472 | 561 | |||||||||
| Total operating revenues | 2,062 | 1,879 | |||||||||
| Operating Expenses: | |||||||||||
| Fuel | 113 | 176 | |||||||||
| Purchased power | 495 | 177 | |||||||||
| Natural gas purchased for resale | 208 | 293 | |||||||||
| Other operations and maintenance | 448 | 461 | |||||||||
| Depreciation and amortization | 320 | 299 | |||||||||
| Taxes other than income taxes | 127 | 142 | |||||||||
| Total operating expenses | 1,711 | 1,548 | |||||||||
| Operating Income | 351 | 331 | |||||||||
| Other Income, Net | 78 | 60 | |||||||||
| Interest Charges | 127 | 104 | |||||||||
| Income Before Income Taxes | 302 | 287 | |||||||||
| Income Taxes | 37 | 34 | |||||||||
| Net Income | 265 | 253 | |||||||||
| Less: Net Income Attributable to Noncontrolling Interests | 1 | 1 | |||||||||
| Net Income Attributable to Ameren Common Shareholders | $ | 264 | $ | 252 | |||||||
| Earnings per Common Share – Basic | $ | 1.01 | $ | 0.98 | |||||||
| Earnings per Common Share – Diluted | $ | 1.00 | $ | 0.97 | |||||||
| Weighted-average Common Shares Outstanding – Basic | 262.2 | 257.9 | |||||||||
| Weighted-average Common Shares Outstanding – Diluted | 263.1 | 259.0 | |||||||||
| March 31, 2023 | December 31, 2022 | ||||||||||
| ASSETS | |||||||||||
| Current Assets: | |||||||||||
| Cash and cash equivalents | $ | 10 | $ | 10 | |||||||
| Accounts receivable - trade (less allowance for doubtful accounts) | 625 | 600 | |||||||||
| Unbilled revenue | 299 | 446 | |||||||||
| Miscellaneous accounts receivable | 62 | 54 | |||||||||
| Inventories | 630 | 667 | |||||||||
| Current regulatory assets | 292 | 354 | |||||||||
| Investment in industrial development revenue bonds | — | 240 | |||||||||
| Current collateral assets | 29 | 142 | |||||||||
| Other current assets | 115 | 155 | |||||||||
| Total current assets | 2,062 | 2,668 | |||||||||
| Property, Plant, and Equipment, Net | 31,735 | 31,262 | |||||||||
| Investments and Other Assets: | |||||||||||
| Nuclear decommissioning trust fund | 1,019 | 958 | |||||||||
| Goodwill | 411 | 411 | |||||||||
| Regulatory assets | 1,599 | 1,426 | |||||||||
| Pension and other postretirement benefits | 423 | 411 | |||||||||
| Other assets | 815 | 768 | |||||||||
| Total investments and other assets | 4,267 | 3,974 | |||||||||
| TOTAL ASSETS | $ | 38,064 | $ | 37,904 | |||||||
| LIABILITIES AND EQUITY | |||||||||||
| Current Liabilities: | |||||||||||
| Current maturities of long-term debt | $ | 100 | $ | 340 | |||||||
| Short-term debt | 1,248 | 1,070 | |||||||||
| Accounts and wages payable | 664 | 1,159 | |||||||||
| Other current liabilities | 745 | 797 | |||||||||
| Total current liabilities | 2,757 | 3,366 | |||||||||
| Long-term Debt, Net | 14,181 | 13,685 | |||||||||
| Deferred Credits and Other Liabilities: | |||||||||||
| Accumulated deferred income taxes and tax credits, net | 3,856 | 3,804 | |||||||||
| Regulatory liabilities | 5,395 | 5,309 | |||||||||
| Asset retirement obligations | 769 | 763 | |||||||||
| Other deferred credits and liabilities | 370 | 340 | |||||||||
| Total deferred credits and other liabilities | 10,390 | 10,216 | |||||||||
| Shareholders’ Equity: | |||||||||||
| Common stock | 3 | 3 | |||||||||
| Other paid-in capital, principally premium on common stock | 6,861 | 6,860 | |||||||||
| Retained earnings | 3,745 | 3,646 | |||||||||
| Accumulated other comprehensive loss | (2) | (1) | |||||||||
| Total shareholders’ equity | 10,607 | 10,508 | |||||||||
| Noncontrolling Interests | 129 | 129 | |||||||||
| Total equity | 10,736 | 10,637 | |||||||||
| TOTAL LIABILITIES AND EQUITY | $ | 38,064 | $ | 37,904 | |||||||
| Three Months Ended March 31, | |||||||||||
| 2023 | 2022 | ||||||||||
| Cash Flows From Operating Activities: | |||||||||||
| Net income | $ | 265 | $ | 253 | |||||||
| Adjustments to reconcile net income to net cash provided by operating activities: | |||||||||||
| Depreciation and amortization | 350 | 324 | |||||||||
| Amortization of nuclear fuel | 19 | 22 | |||||||||
| Amortization of debt issuance costs and premium/discounts | 3 | 4 | |||||||||
| Deferred income taxes and investment tax credits, net | 35 | 31 | |||||||||
| Allowance for equity funds used during construction | (9) | (8) | |||||||||
| Stock-based compensation costs | 8 | 4 | |||||||||
| Other | (6) | 11 | |||||||||
| Changes in assets and liabilities | (169) | (253) | |||||||||
| Net cash provided by operating activities | 496 | 388 | |||||||||
| Cash Flows From Investing Activities: | |||||||||||
| Capital expenditures | (931) | (774) | |||||||||
| Nuclear fuel expenditures | (20) | (16) | |||||||||
| Purchases of securities – nuclear decommissioning trust fund | (29) | (97) | |||||||||
| Sales and maturities of securities – nuclear decommissioning trust fund | 17 | 92 | |||||||||
| Other | (1) | 15 | |||||||||
| Net cash used in investing activities | (964) | (780) | |||||||||
| Cash Flows From Financing Activities: | |||||||||||
| Dividends on common stock | (165) | (152) | |||||||||
| Dividends paid to noncontrolling interest holders | (1) | (1) | |||||||||
| Short-term debt, net | 179 | 555 | |||||||||
| Issuances of long-term debt | 499 | — | |||||||||
| Issuances of common stock | 5 | 5 | |||||||||
| Employee payroll taxes related to stock-based compensation | (20) | (16) | |||||||||
| Debt issuance costs | (5) | — | |||||||||
| Other | (3) | — | |||||||||
| Net cash provided by financing activities | 489 | 391 | |||||||||
| Net change in cash, cash equivalents, and restricted cash | 21 | (1) | |||||||||
| Cash, cash equivalents, and restricted cash at beginning of year | 216 | 155 | |||||||||
| Cash, cash equivalents, and restricted cash at end of period | $ | 237 | $ | 154 | |||||||