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Derivative Financial Instruments (Derivative Instruments Carrying Value) (Details) - Not Designated As Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 22 | $ 89
Derivative liabilities | 168 | 136
Fuel oils | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 2 | 13
Fuel oils | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 3
Fuel oils | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 1 | 0
Fuel oils | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 1 | 0
Natural gas | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 30
Natural gas | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 6 | 20
Natural gas | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 57 | 27
Natural gas | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 40 | 11
Power | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 5 | 16
Power | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 4
Power | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 13 | 61
Power | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 56 | 37
Uranium | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 9 | 2
Uranium | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 1
Ameren Missouri |  |
Derivative [Line Items] |  |
Derivative assets | 19 | 49
Derivative liabilities | 25 | 68
Ameren Missouri | Fuel oils | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 2 | 13
Ameren Missouri | Fuel oils | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 3
Ameren Missouri | Fuel oils | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 1 | 0
Ameren Missouri | Fuel oils | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 1 | 0
Ameren Missouri | Natural gas | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 7
Ameren Missouri | Natural gas | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 3 | 9
Ameren Missouri | Natural gas | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 12 | 7
Ameren Missouri | Natural gas | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 10 | 2
Ameren Missouri | Power | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 5 | 14
Ameren Missouri | Power | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 0
Ameren Missouri | Power | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 1 | 59
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 | 9 | 2
Ameren Missouri | Uranium | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 1
Ameren Illinois |  |
Derivative [Line Items] |  |
Derivative assets | 3 | 40
Derivative liabilities | 143 | 68
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 | 0 | 23
Ameren Illinois | Natural gas | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 3 | 11
Ameren Illinois | Natural gas | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 45 | 20
Ameren Illinois | Natural gas | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 30 | 9
Ameren Illinois | Power | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 2
Ameren Illinois | Power | Other assets |  |
Derivative [Line Items] |  |
Derivative assets | 0 | 4
Ameren Illinois | Power | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 12 | 2
Ameren Illinois | Power | Other deferred credits and liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | 56 | 37
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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