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Derivative Financial Instruments (Offsetting Assets and Liabilities) (Details) - Not Designated As Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 89 | $ 90
Derivative Liability, Fair Value, Gross Liability | 136 | 202
Derivative, Collateral, Obligation to Return Securities | 29 | 19
Derivative, Collateral, Right to Reclaim Securities | 29 | 19
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 56 | 47
Derivative Asset | 60 | 71
Derivative Liability | 51 | 136
Union Electric Company |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 49 | 49
Derivative Liability, Fair Value, Gross Liability | 68 | 77
Derivative, Collateral, Obligation to Return Securities | 9 | 15
Derivative, Collateral, Right to Reclaim Securities | 9 | 15
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 56 | 47
Derivative Asset | 40 | 34
Derivative Liability | 3 | 15
Ameren Illinois Company |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 40 | 41
Derivative Liability, Fair Value, Gross Liability | 68 | 125
Derivative, Collateral, Obligation to Return Securities | 20 | 4
Derivative, Collateral, Right to Reclaim Securities | 20 | 4
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Asset | 20 | 37
Derivative Liability | $ 48 | $ 121

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