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Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock | Other Paid-in Capital: | Retained Earnings: | Deferred Retirement Benefit Costs | Accumulated Other Comprehensive Income (Loss): | Total Shareholders’ Equity | Noncontrolling Interests: | Union Electric Company | Union Electric Company Common Stock | Union Electric Company Other Paid-in Capital: | Union Electric Company Preferred Stock | Union Electric Company Retained Earnings: | Ameren Illinois Company | Ameren Illinois Company Common Stock | Ameren Illinois Company Other Paid-in Capital: | Ameren Illinois Company Preferred Stock | Ameren Illinois Company Retained Earnings:
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Beginning of period at Dec. 31, 2021 |  |  | $ 6,502 | $ 3,182 | $ 13 |  |  | $ 129 |  |  |  |  | $ 2,595 |  |  | $ 2,914 |  | $ 2,677
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 37 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  |
Stock-based compensation activity |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 915 |  |  |  |  |  |  |  | $ 550 |  |  |  | 550 | 376 |  |  |  | 376
Net income attributable to Ameren common shareholders | 911 |  |  | 911 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (457) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  |  | (1)
Change in deferred retirement benefit costs | 1 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (4) |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (4) |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at beginning of period at Dec. 31, 2021 | 257,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock-based compensation | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at end of period at Sep. 30, 2022 | 258,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period at Sep. 30, 2022 | $ 10,330 | $ 3 | 6,548 | 3,636 | 14 | $ 14 |  | 129 |  | $ 511 | $ 2,725 | $ 80 | 3,142 |  | $ 0 | 2,914 | $ 49 | 3,052
Shareholders' equity, end of year at Sep. 30, 2022 |  |  |  |  |  |  | $ 10,201 |  | 6,458 |  |  |  |  | 6,015 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 1.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period at Jun. 30, 2022 |  |  | 6,527 | 3,336 | 14 |  |  | 129 |  |  |  |  | 2,745 |  |  | 2,914 |  | 2,949
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Stock-based compensation activity |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 453 |  |  |  |  |  |  |  | 398 |  |  |  | 398 | 103 |  |  |  | 103
Net income attributable to Ameren common shareholders | 452 |  |  | 452 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (152) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  | 0
Change in deferred retirement benefit costs | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (1) |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at beginning of period at Jun. 30, 2022 | 258,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock-based compensation | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at end of period at Sep. 30, 2022 | 258,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period at Sep. 30, 2022 | $ 10,330 | 3 | 6,548 | 3,636 | 14 | 14 |  | 129 |  | 511 | 2,725 | 80 | 3,142 |  | 0 | 2,914 | 49 | 3,052
Shareholders' equity, end of year at Sep. 30, 2022 |  |  |  |  |  |  | 10,201 |  | 6,458 |  |  |  |  | 6,015 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 0.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period at Dec. 31, 2022 | $ 10,637 |  | 6,860 | 3,646 | (1) |  |  | 129 |  |  |  |  | 3,111 |  |  | 2,929 |  | 3,190
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  | 50 |  |
Stock-based compensation activity |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 998 |  |  |  |  |  |  |  | $ 544 |  |  |  | 544 | $ 453 |  |  |  | 453
Net income attributable to Ameren common shareholders | 994 |  |  | 994 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (496) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  |  |  | (1)
Change in deferred retirement benefit costs | (3) |  |  |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (4) |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (4) |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at beginning of period at Dec. 31, 2022 | 262,000,000.0 |  |  |  |  |  |  |  | 102,100,000 |  |  |  |  | 25,500,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock-based compensation | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at end of period at Sep. 30, 2023 | 262,900,000 |  |  |  |  |  |  |  | 102,100,000 |  |  |  |  | 25,500,000 |  |  |  |
End of period at Sep. 30, 2023 | $ 11,172 | 3 | 6,900 | 4,144 | (4) | (4) |  | 129 |  | 511 | 2,725 | 80 | 3,652 |  | 0 | 2,979 | 49 | 3,642
Shareholders' equity, end of year at Sep. 30, 2023 | $ 11,043 |  |  |  |  |  | 11,043 |  | $ 6,968 |  |  |  |  | $ 6,670 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 1.89 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period at Jun. 30, 2023 |  |  | 6,880 | 3,817 | (3) |  |  | 129 |  |  |  |  | 3,241 |  |  | 2,929 |  | 3,517
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |
Stock-based compensation activity |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 494 |  |  |  |  |  |  |  | $ 412 |  |  |  | 412 | $ 125 |  |  |  | 125
Net income attributable to Ameren common shareholders | 493 |  |  | 493 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (166) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  | 0
Change in deferred retirement benefit costs | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (1) |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at beginning of period at Jun. 30, 2023 | 262,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock-based compensation | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at end of period at Sep. 30, 2023 | 262,900,000 |  |  |  |  |  |  |  | 102,100,000 |  |  |  |  | 25,500,000 |  |  |  |
End of period at Sep. 30, 2023 | $ 11,172 | $ 3 | $ 6,900 | $ 4,144 | $ (4) | $ (4) |  | $ 129 |  | $ 511 | $ 2,725 | $ 80 | $ 3,652 |  | $ 0 | $ 2,979 | $ 49 | $ 3,642
Shareholders' equity, end of year at Sep. 30, 2023 | $ 11,043 |  |  |  |  |  | $ 11,043 |  | $ 6,968 |  |  |  |  | $ 6,670 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 0.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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