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Derivative Financial Instruments (Derivative Instruments Carrying Value) (Details) - Not Designated As Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 16 | $ 22
Derivative liabilities | 103 | 168
Fuel oils | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 2
Fuel oils | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Fuel oils | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 2 | 1
Fuel oils | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 2 | 1
Natural gas | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 4 | 0
Natural gas | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 6 | 6
Natural gas | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 27 | 57
Natural gas | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 19 | 40
Power | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 6 | 5
Power | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Power | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 10 | 13
Power | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 43 | 56
Uranium | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 9
Uranium | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Missouri |  |
Derivative [Line Items] |  |
Derivative assets | 10 | 19
Derivative liabilities | 15 | 25
Ameren Missouri | Fuel oils | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 2
Ameren Missouri | Fuel oils | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Missouri | Fuel oils | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 2 | 1
Ameren Missouri | Fuel oils | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 2 | 1
Ameren Missouri | Natural gas | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 2 | 0
Ameren Missouri | Natural gas | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 2 | 3
Ameren Missouri | Natural gas | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 5 | 12
Ameren Missouri | Natural gas | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 6 | 10
Ameren Missouri | Power | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 6 | 5
Ameren Missouri | Power | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Missouri | Power | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 0 | 1
Ameren Missouri | Power | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 0 | 0
Ameren Missouri | Uranium | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 9
Ameren Missouri | Uranium | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Illinois |  |
Derivative [Line Items] |  |
Derivative assets | 6 | 3
Derivative liabilities | 88 | 143
Ameren Illinois | Fuel oils | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Illinois | Fuel oils | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Illinois | Fuel oils | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 0 | 0
Ameren Illinois | Fuel oils | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 0 | 0
Ameren Illinois | Natural gas | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 2 | 0
Ameren Illinois | Natural gas | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 4 | 3
Ameren Illinois | Natural gas | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 22 | 45
Ameren Illinois | Natural gas | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 13 | 30
Ameren Illinois | Power | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Illinois | Power | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Illinois | Power | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 10 | 12
Ameren Illinois | Power | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 43 | 56
Ameren Illinois | Uranium | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Illinois | Uranium | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | $ 0 | $ 0

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