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Consolidated Statement Of Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock | Other Paid-In Capital | Retained Earnings | Derivative Financial Instruments | Deferred Retirement Benefit Costs | Accumulated Other Comprehensive Income (Loss) | Total Ameren Corporation Stockholders' Equity | Noncontrolling Interest | Ameren Missouri | Ameren Missouri Common Stock | Ameren Missouri Other Paid-In Capital | Ameren Missouri Preferred Stock Not Subject To Mandatory Redemption | Ameren Missouri Retained Earnings | Ameren Illinois | Ameren Illinois Common Stock | Ameren Illinois Other Paid-In Capital | Ameren Illinois Preferred Stock Not Subject To Mandatory Redemption | Ameren Illinois Retained Earnings
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Common Stock at Dec. 31, 2021 |  |  | $ 6,502 | $ 3,182 | $ 0 | $ 13 |  |  | $ 129 |  |  | $ 2,725 |  | $ 2,595 |  |  | $ 2,914 |  | $ 2,677
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | 292 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution from parent |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  |  | $ 15 |  | 15 |  |
Net income | $ 1,079 |  |  |  |  |  |  |  |  |  |  |  |  | 565 |  |  |  |  | 515
Net Income (Loss) Available to Common Stockholders, Basic | 1,074 |  |  | 1,074 |  |  |  |  |  | 562 |  |  |  |  | 513 |  |  |  |
Common stock dividends |  |  |  | (610) |  |  |  |  |  |  |  |  |  | (46) |  |  |  |  | 0
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  |  | (2)
Change in derivative financial instruments |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in deferred retirement benefit costs | (14) |  |  |  |  | (14) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (5) |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  |  | (5) |  |  |  |  |  |  |  |  |  |
Beginning of year (shares) at Dec. 31, 2021 | 257,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of year (shares) at Dec. 31, 2022 | 262,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of year at Dec. 31, 2022 | $ 10,637 | $ 3 | 6,860 | 3,646 | 0 | (1) | $ (1) |  | 129 |  | $ 511 | 2,725 | $ 80 | 3,111 |  | $ 0 | 2,929 | $ 49 | 3,190
Stockholders' equity, end of year at Dec. 31, 2022 |  |  |  |  |  |  |  | $ 10,508 |  | 6,427 |  |  |  |  | 6,168 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 2.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | 299 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution from parent |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  | 91 |  | 91 |  |
Net income | $ 1,157 |  |  |  |  |  |  |  |  |  |  |  |  | 548 |  |  |  |  | 609
Net Income (Loss) Available to Common Stockholders, Basic | 1,152 |  |  | 1,152 |  |  |  |  |  | 545 |  |  |  |  | $ 607 |  |  |  |
Common stock dividends |  |  |  | (662) |  |  |  |  |  |  |  |  |  | (9) |  |  |  |  | (41)
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  |  | (2)
Change in derivative financial instruments |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in deferred retirement benefit costs | (5) |  |  |  |  | (5) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (5) |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  |  | (5) |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of year (shares) at Dec. 31, 2023 | 266,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,500,000 |  |  |  |
End of year at Dec. 31, 2023 | $ 11,478 | 3 | 7,216 | 4,136 | 0 | (6) | (6) |  | 129 |  | 511 | 2,725 | 80 | 3,647 |  | 0 | 3,020 | 49 | 3,756
Stockholders' equity, end of year at Dec. 31, 2023 | $ 11,349 |  |  |  |  |  |  | 11,349 |  | 6,963 |  |  |  |  | $ 6,825 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 2.52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | 233 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution from parent |  |  |  |  |  |  |  |  |  | 476 |  | 476 |  |  | 36 |  | 36 |  |
Net income | $ 1,187 |  |  |  |  |  |  |  |  |  |  |  |  | 562 |  |  |  |  | 622
Net Income (Loss) Available to Common Stockholders, Basic | 1,182 |  |  | 1,182 |  |  |  |  |  | $ 559 |  |  |  |  | $ 620 |  |  |  |
Common stock dividends |  |  |  | (714) |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | (110)
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  |  | (2)
Change in derivative financial instruments |  |  |  |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in deferred retirement benefit costs | (3) |  |  |  |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (5) |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  |  | (5) |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of year (shares) at Dec. 31, 2024 | 269,900,000 |  |  |  |  |  |  |  |  | 102,100,000 |  |  |  |  | 25,500,000 |  |  |  |
End of year at Dec. 31, 2024 | $ 12,243 | $ 3 | $ 7,513 | $ 4,604 | $ 3 | $ (9) | $ (6) |  | $ 129 |  | $ 511 | $ 3,201 | $ 80 | $ 4,206 |  | $ 0 | $ 3,056 | $ 49 | $ 4,266
Stockholders' equity, end of year at Dec. 31, 2024 | $ 12,114 |  |  |  |  |  |  | $ 12,114 |  | $ 7,998 |  |  |  |  | $ 7,371 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 2.68 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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