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Property and Plant, Net (Schedule of Capitalized Software, Future Amortization Expense) (Details) - Capitalized software costs
$ in Millions
Dec. 31, 2023
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2024 $ 202
2025 147
2026 106
2027 79
2028 45
Ameren Missouri  
Finite-Lived Intangible Assets [Line Items]  
2024 106
2025 76
2026 52
2027 38
2028 22
Ameren Illinois  
Finite-Lived Intangible Assets [Line Items]  
2024 90
2025 65
2026 51
2027 38
2028 $ 23