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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Unconsolidated variable interest | $ 61 | $ 56
Cash Surrender Value of Life Insurance | 244 | 278
Corporate owned life insurance, borrowings | 108 | 109
Ameren Illinois Company |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Cash Surrender Value of Life Insurance | 115 | 117
Corporate owned life insurance, borrowings | 108 | $ 109
Partnership Funding Commitment |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Outstanding funding commitments | $ 22 |

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