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Schedule I - Condensed Financial Information Of Parent (Statement of Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]      
Operating revenues $ 8,799 $ 7,623 $ 7,500
Operating expenses 6,773 6,107 5,942
Operating loss 2,026 1,516 1,558
Equity in earnings of subsidiaries (19) (4) 1
Interest income from affiliates 41 41 33
Total other income (expense), net 347 417 348
Interest Charges (776) (663) (566)
Income tax benefit 136 83 183
Comprehensive Income from Continuing Operations      
Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $1, $—, and $(2), respectively 3 (3) (5)
Unrealized net gain on derivative hedging instruments, net of income taxes of $2, $—, and $—, respectively 3 3 0
Comprehensive Income Attributable to Ameren Common Shareholders 1,462 1,182 1,147
Other Comprehensive Income (Loss), Taxes:      
Pension and other postretirement benefit plan activity, tax (benefit) 1 0 (2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax 2 0 0
Ameren (parent)      
Condensed Financial Statements, Captions [Line Items]      
Operating revenues 0 0 0
Operating expenses 19 17 22
Operating loss (19) (17) (22)
Equity in earnings of subsidiaries 1,596 1,271 1,245
Interest income from affiliates 11 14 10
Total other income (expense), net 0 3 (11)
Interest Charges (196) (162) (119)
Income tax benefit 59 61 49
Net Income Attributable to Ameren Common Shareholders 1,451 1,170 1,152
Comprehensive Income from Continuing Operations      
Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $1, $—, and $(2), respectively 3 (3) (5)
Unrealized net gain on derivative hedging instruments, net of income taxes of $2, $—, and $—, respectively (3) (3) 0
Comprehensive Income Attributable to Ameren Common Shareholders 1,457 1,170 1,147
Other Comprehensive Income (Loss), Taxes:      
Pension and other postretirement benefit plan activity, tax (benefit) 1 0 (2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax $ 2 $ 0 $ 0