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Other Income, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Nonoperating Income (Expense) [Line Items]        
Allowance for equity funds used during construction $ 21 $ 23 $ 60 $ 48
Other interest income 10 8 31 29
Non-service cost components of net periodic benefit income 59 76 187 228
Miscellaneous income 6 0 13 6
Gain (Loss) on Extinguishment of Debt 0 0 8 0
Income (Loss) from Equity Method Investments (9) (2) (19) (1)
Donations (6) (1) (9) (5)
Miscellaneous expense (5) (3) (14) (12)
Total Other Income, Net 76 101 257 293
Union Electric Company        
Other Nonoperating Income (Expense) [Line Items]        
Allowance for equity funds used during construction 14 15 37 38
Other interest income 3 2 7 7
Non-service cost components of net periodic benefit income 29 35 96 104
Miscellaneous income 4 1 6 3
Donations (2) 0 (4) (2)
Miscellaneous expense (3) (2) (7) (6)
Total Other Income, Net 45 51 135 144
Defined Benefit Plan, Non-service Cost or Income Components - Tracker (9) (11) (41) (31)
Ameren Illinois Company        
Other Nonoperating Income (Expense) [Line Items]        
Allowance for equity funds used during construction 6 8 21 10
Other interest income 7 7 24 22
Non-service cost components of net periodic benefit income 21 25 61 78
Miscellaneous income 2 0 7 3
Donations (4) 0 (5) (2)
Miscellaneous expense (2) (3) (7) (6)
Total Other Income, Net $ 30 $ 37 $ 101 $ 105