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Schedule I - Condensed Financial Information Of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash flows provided by operating activities | $ 2,564 | $ 2,263 | $ 1,661
Cash Flows From Investing Activities: |  |  |
Other | (1) | 23 | 8
Net cash flows provided by (used in) investing activities | (3,798) | (3,370) | (3,528)
Cash flows from financing activities: |  |  |
Dividends on common stock | (662) | (610) | (565)
Short-term debt, net | (533) | 522 | 55
Maturities of long-term debt | (100) | (505) | (8)
Issuances of long-term debt | 2,295 | 1,467 | 1,997
Issuances of common stock | 346 | 333 | 308
Employee payroll taxes related to stock-based compensation | (20) | (16) | (17)
Debt issuance costs | (21) | (18) | (18)
Net cash flows provided by (used in) financing activities | 1,290 | 1,168 | 1,721
Cash, cash equivalents, and restricted cash at beginning of year | 216 | 155 | 301
Cash, cash equivalents, and restricted cash at end of year | 272 | 216 | 155
Noncash Investing and Financing Items [Abstract] |  |  |
Stock Issued |  | 31 |
Ameren (parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash flows provided by operating activities | 171 | 44 | 79
Cash Flows From Investing Activities: |  |  |
Money pool advances, net |  | 40 |
Money pool advances, net | (530) |  | (92)
Notes receivable – ATXI | 0 | 35 | 40
Investments in subsidiaries | (109) | (30) | (489)
Other | 5 | 3 | 7
Net cash flows provided by (used in) investing activities | (634) | 48 | (534)
Cash flows from financing activities: |  |  |
Dividends on common stock | (662) | (610) | (565)
Short-term debt, net | (475) | 198 | (213)
Issuances of long-term debt | 1,298 | 0 | 949
Issuances of common stock | 346 | 333 | 308
Employee payroll taxes related to stock-based compensation | (20) | (16) | (17)
Debt issuance costs | (8) | (1) | (7)
Net cash flows provided by (used in) financing activities | 479 | (96) | 455
Net change in cash, cash equivalents, and restricted cash | 16 | (4) | 0
Cash, cash equivalents, and restricted cash at beginning of year | 0 | 4 | 4
Cash, cash equivalents, and restricted cash at end of year | 16 | 0 | 4
Cash dividends received from consolidated subsidiaries | 173 | 76 | 123
Noncash Investing and Financing Items [Abstract] |  |  |
Stock Issued | $ 40 | $ 31 | $ 33

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