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Schedule I - Condensed Financial Information Of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | $ 3,353 | $ 2,763 | $ 2,564
Cash Flows From Investing Activities: |  |  |
Other | 53 | (26) | (1)
Net cash used in investing activities | (4,145) | (4,456) | (3,798)
Cash flows from financing activities: |  |  |
Dividends on common stock | (768) | (714) | (662)
Short-term debt, net | (499) | 607 | (533)
Maturities and extinguishment of long-term debt | (341) | (893) | (100)
Issuances of long-term debt | 1,960 | 2,535 | 2,295
Issuances of common stock | 574 | 273 | 346
Employee payroll taxes related to stock-based compensation | (13) | (8) | (20)
Debt issuance costs | (24) | (31) | (21)
Net cash provided by (used in) financing activities | 884 | 1,749 | 1,290
Cash, cash equivalents, and restricted cash at beginning of year | 328 | 272 | 216
Cash, cash equivalents, and restricted cash at end of year | 420 | 328 | 272
Noncash Investing and Financing Items [Abstract] |  |  |
Stock Issued |  | 16 |
Ameren (parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | 451 | (65) | 171
Cash Flows From Investing Activities: |  |  |
Money pool advances, net | 74 |  | 530
Money pool advances, net |  | (495) |
Investments in subsidiaries | (51) | (557) | (109)
Investments in subsidiary debt securities | 24 | 44 | 0
Other | 62 | 1 | 5
Net cash used in investing activities | (87) | (105) | (634)
Cash flows from financing activities: |  |  |
Dividends on common stock | (768) | (714) | (662)
Short-term debt, net | (899) | 1,054 | (475)
Maturities and extinguishment of long-term debt | 0 | (450) | 0
Issuances of long-term debt | 749 | 0 | 1,298
Issuances of common stock | 574 | 273 | 346
Employee payroll taxes related to stock-based compensation | (13) | (8) | (20)
Debt issuance costs | (7) | (1) | (8)
Net cash provided by (used in) financing activities | (364) | 154 | 479
Net change in cash, cash equivalents, and restricted cash | 0 | (16) | 16
Cash, cash equivalents, and restricted cash at beginning of year | 0 | 16 | 0
Cash, cash equivalents, and restricted cash at end of year | 0 | 0 | 16
Cash dividends received from consolidated subsidiaries | 550 | 140 | 173
Noncash Investing and Financing Items [Abstract] |  |  |
Stock Issued | $ 25 | $ 16 | $ 40

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