v3.25.2
Other Income, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Other Nonoperating Income (Expense) [Line Items]        
Allowance for equity funds used during construction $ 23 $ 16 $ 39 $ 25
Other interest income 10 13 21 21
Non-service cost components of net periodic benefit income 62 76 128 152
Miscellaneous income 4 4 7 6
Gain (Loss) on Extinguishment of Debt 8 0 8 0
Income (Loss) from Equity Method Investments (6) 1 (10) 1
Donations (1) (2) (3) (4)
Miscellaneous expense (4) (5) (9) (9)
Total Other Income, Net 96 103 181 192
Union Electric Company        
Other Nonoperating Income (Expense) [Line Items]        
Allowance for equity funds used during construction 15 14 23 23
Other interest income 2 3 4 5
Non-service cost components of net periodic benefit income 32 35 67 69
Miscellaneous income 1 0 2 2
Donations (1) (1) (2) (2)
Miscellaneous expense (2) (2) (4) (4)
Total Other Income, Net 47 49 90 93
Defined Benefit Plan, Non-service Cost or Income Components - Tracker (16) (11) (32) (20)
Ameren Illinois Company        
Other Nonoperating Income (Expense) [Line Items]        
Allowance for equity funds used during construction 8 2 15 2
Other interest income 8 9 17 15
Non-service cost components of net periodic benefit income 20 26 40 53
Miscellaneous income 3 2 5 3
Donations 0 (1) (1) (2)
Miscellaneous expense (2) (1) (5) (3)
Total Other Income, Net $ 37 $ 37 $ 71 $ 68