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Schedule I - Condensed Financial Information Of Parent (Statement of Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Operating revenues $ 7,500 $ 7,957 $ 6,394
Operating expenses 5,942 6,442 5,061
Operating loss 1,558 1,515 1,333
Equity in earnings of subsidiaries 1 2 12
Interest income from affiliates 32 11 2
Total other expense, net 348 226 202
Interest Charges (566) (486) (383)
Income tax benefit 183 176 157
Comprehensive Income from Continuing Operations      
Pension and other postretirement benefit plan activity, net of income taxes (benefit) (5) (14) 14
Comprehensive Income Attributable to Ameren Common Shareholders 1,147 1,060 1,004
Other Comprehensive Income (Loss), Taxes:      
Pension and other postretirement benefit plan activity, tax (benefit) (2) (4) 4
Ameren (parent)      
Condensed Financial Statements, Captions [Line Items]      
Operating revenues 0 0 0
Operating expenses 22 15 13
Operating loss (22) (15) (13)
Equity in earnings of subsidiaries 1,245 1,161 1,039
Interest income from affiliates 10 2 3
Total other expense, net (11) (13) 0
Interest Charges (119) (86) (64)
Income tax benefit 49 25 25
Net Income Attributable to Ameren Common Shareholders 1,152 1,074 990
Comprehensive Income from Continuing Operations      
Pension and other postretirement benefit plan activity, net of income taxes (benefit) (5) (14) 14
Comprehensive Income Attributable to Ameren Common Shareholders 1,147 1,060 1,004
Other Comprehensive Income (Loss), Taxes:      
Pension and other postretirement benefit plan activity, tax (benefit) $ (2) $ (4) $ 4