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Property and Plant, Net (Schedule of Capitalized Software, Future Amortization Expense) (Details) - Capitalized software costs
$ in Millions
Dec. 31, 2022
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2023 $ 170
2024 131
2025 83
2026 51
2027 30
Union Electric Company  
Finite-Lived Intangible Assets [Line Items]  
2023 91
2024 71
2025 46
2026 26
2027 15
Ameren Illinois Company  
Finite-Lived Intangible Assets [Line Items]  
2023 74
2024 56
2025 35
2026 24
2027 $ 15