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Schedule I - Condensed Financial Information Of Parent (Statement of Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating revenues | $ 7,623 | $ 7,500 | $ 7,957
Operating expenses | 6,107 | 5,942 | 6,442
Operating loss | 1,516 | 1,558 | 1,515
Equity in earnings of subsidiaries | (4) | 1 | 2
Interest income from affiliates | 41 | 32 | 11
Total other income (expense), net | 417 | 348 | 226
Interest Charges | (663) | (566) | (486)
Income tax benefit | 83 | 183 | 176
Comprehensive Income from Continuing Operations |  |  |
Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $—, $(2), and $(4), respectively | (3) | (5) | (14)
Unrealized net gain on derivative hedging instruments, net of income taxes of $—, $—, and $—, respectively | 3 | 0 | 0
Comprehensive Income Attributable to Ameren Common Shareholders | 1,182 | 1,147 | 1,060
Other Comprehensive Income (Loss), Taxes: |  |  |
Pension and other postretirement benefit plan activity, tax (benefit) | 0 | (2) | (4)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax | 0 | 0 | 0
Ameren (parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Operating expenses | 17 | 22 | 15
Operating loss | (17) | (22) | (15)
Equity in earnings of subsidiaries | 1,271 | 1,245 | 1,161
Interest income from affiliates | 14 | 10 | 2
Total other income (expense), net | 3 | (11) | (13)
Interest Charges | (162) | (119) | (86)
Income tax benefit | 61 | 49 | 25
Net Income Attributable to Ameren Common Shareholders | 1,170 | 1,152 | 1,074
Comprehensive Income from Continuing Operations |  |  |
Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $—, $(2), and $(4), respectively | (3) | (5) | (14)
Unrealized net gain on derivative hedging instruments, net of income taxes of $—, $—, and $—, respectively | (3) | 0 | 0
Comprehensive Income Attributable to Ameren Common Shareholders | 1,170 | 1,147 | 1,060
Other Comprehensive Income (Loss), Taxes: |  |  |
Pension and other postretirement benefit plan activity, tax (benefit) | $ 0 | $ (2) | $ (4)

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