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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 |  |  |  |  | $ 2,677
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 462 |  |  |  |  |  |  |  | $ 152 |  |  |  | 152 | $ 273 |  |  |  | 273
Net income attributable to Ameren common shareholders | 459 |  |  | 459 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (305) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  | (1)
Change in deferred retirement benefit costs | 1 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (3) |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (3) |  |  |  |  |  |  |  |  |  |
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 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock-based compensation | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at end of period at Jun. 30, 2022 | 258,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period at Jun. 30, 2022 | $ 10,009 | $ 3 | 6,527 | 3,336 | 14 | $ 14 |  | 129 |  | $ 511 | $ 2,725 | $ 80 | 2,745 |  | $ 0 | $ 2,914 | $ 49 | 2,949
Shareholders' equity, end of year at Jun. 30, 2022 |  |  |  |  |  |  | $ 9,880 |  | 6,061 |  |  |  |  | 5,912 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 1.18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period at Mar. 31, 2022 |  |  | 6,507 | 3,282 | 14 |  |  | 129 |  |  |  |  | 2,645 |  |  |  |  | 2,846
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 209 |  |  |  |  |  |  |  | 101 |  |  |  | 101 | 104 |  |  |  | 104
Net income attributable to Ameren common shareholders | 207 |  |  | 207 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (153) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  | (1)
Change in deferred retirement benefit costs | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (2) |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at beginning of period at Mar. 31, 2022 | 258,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 Jun. 30, 2022 | 258,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period at Jun. 30, 2022 | $ 10,009 | 3 | 6,527 | 3,336 | 14 | 14 |  | 129 |  | 511 | 2,725 | 80 | 2,745 |  | 0 | 2,914 | 49 | 2,949
Shareholders' equity, end of year at Jun. 30, 2022 |  |  |  |  |  |  | 9,880 |  | 6,061 |  |  |  |  | 5,912 |  |  |  |
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 |  |  |  |  | 3,190
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 504 |  |  |  |  |  |  |  | $ 132 |  |  |  | 132 | $ 328 |  |  |  | 328
Net income attributable to Ameren common shareholders | 501 |  |  | 501 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (330) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  | (1)
Change in deferred retirement benefit costs | (2) |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (3) |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (3) |  |  |  |  |  |  |  |  |  |
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 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock-based compensation | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at end of period at Jun. 30, 2023 | 262,700,000 |  |  |  |  |  |  |  | 102,100,000 |  |  |  |  | 25,500,000 |  |  |  |
End of period at Jun. 30, 2023 | $ 10,826 | 3 | 6,880 | 3,817 | (3) | (3) |  | 129 |  | 511 | 2,725 | 80 | 3,241 |  | 0 | 2,929 | 49 | 3,517
Shareholders' equity, end of year at Jun. 30, 2023 | $ 10,697 |  |  |  |  |  | 10,697 |  | $ 6,557 |  |  |  |  | $ 6,495 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 1.26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period at Mar. 31, 2023 |  |  | 6,861 | 3,745 | (2) |  |  | 129 |  |  |  |  | 3,139 |  |  |  |  | 3,388
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under the DRPlus and 401(k) plan |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 239 |  |  |  |  |  |  |  | $ 103 |  |  |  | 103 | $ 130 |  |  |  | 130
Net income attributable to Ameren common shareholders | 237 |  |  | 237 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock |  |  |  | (165) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  | (1)
Change in deferred retirement benefit costs | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest holders | $ (2) |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling interest holders |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |
Common stock shares outstanding at beginning of period at Mar. 31, 2023 | 262,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 Jun. 30, 2023 | 262,700,000 |  |  |  |  |  |  |  | 102,100,000 |  |  |  |  | 25,500,000 |  |  |  |
End of period at Jun. 30, 2023 | $ 10,826 | $ 3 | $ 6,880 | $ 3,817 | $ (3) | $ (3) |  | $ 129 |  | $ 511 | $ 2,725 | $ 80 | $ 3,241 |  | $ 0 | $ 2,929 | $ 49 | $ 3,517
Shareholders' equity, end of year at Jun. 30, 2023 | $ 10,697 |  |  |  |  |  | $ 10,697 |  | $ 6,557 |  |  |  |  | $ 6,495 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 0.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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