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Schedule I - Condensed Financial Information Of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | $ 2,763 | $ 2,564 | $ 2,263
Cash Flows From Investing Activities: |  |  |
Other | (26) | (1) | 23
Net cash provided by (used in) investing activities | (4,456) | (3,798) | (3,370)
Cash flows from financing activities: |  |  |
Dividends on common stock | (714) | (662) | (610)
Short-term debt, net | 607 | (533) | 522
Maturities and extinguishment of long-term debt | (893) | (100) | (505)
Issuances of long-term debt | 2,535 | 2,295 | 1,467
Issuances of common stock | 273 | 346 | 333
Employee payroll taxes related to stock-based compensation | (8) | (20) | (16)
Debt issuance costs | (31) | (21) | (18)
Net cash provided by (used in) financing activities | 1,749 | 1,290 | 1,168
Cash, cash equivalents, and restricted cash at beginning of year | 272 | 216 | 155
Cash, cash equivalents, and restricted cash at end of year | 328 | 272 | 216
Noncash Investing and Financing Items [Abstract] |  |  |
Stock Issued |  | 40 |
Ameren (parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by (used in) operating activities | (65) | 171 | 44
Cash Flows From Investing Activities: |  |  |
Money pool advances, net | 495 |  | 40
Money pool advances, net |  | (530) |
Notes receivable – ATXI | 0 | 0 | 35
Investments in subsidiaries | (557) | (109) | (30)
Investments in subsidiary debt securities | 44 | 0 | 0
Other | 1 | 5 | 3
Net cash provided by (used in) investing activities | (105) | (634) | 48
Cash flows from financing activities: |  |  |
Dividends on common stock | (714) | (662) | (610)
Short-term debt, net | 1,054 | (475) | 198
Maturities and extinguishment of long-term debt | (450) | 0 | 0
Issuances of long-term debt | 0 | 1,298 | 0
Issuances of common stock | 273 | 346 | 333
Employee payroll taxes related to stock-based compensation | (8) | (20) | (16)
Debt issuance costs | (1) | (8) | (1)
Net cash provided by (used in) financing activities | 154 | 479 | (96)
Net change in cash, cash equivalents, and restricted cash | (16) | 16 | (4)
Cash, cash equivalents, and restricted cash at beginning of year | 16 | 0 | 4
Cash, cash equivalents, and restricted cash at end of year | 0 | 16 | 0
Cash dividends received from consolidated subsidiaries | 140 | 173 | 76
Noncash Investing and Financing Items [Abstract] |  |  |
Stock Issued | $ 16 | $ 40 | $ 31

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