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Related Party Transactions - Long Term Debt to Financing Trusts (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | $ 390 | $ 390
ComEd Financing III |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 206 | 206
PECO Trust III |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 81 | 81
PECO Trust IV |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 103 | 103
Related Party |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 390 | 390
Commonwealth Edison Co | ComEd Financing III |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 206 | 205
Commonwealth Edison Co | PECO Trust III |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 0 | 0
Commonwealth Edison Co | PECO Trust IV |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 0 | 0
Commonwealth Edison Co | Related Party |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 206 | 205
PECO Energy Co | ComEd Financing III |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 0 | 0
PECO Energy Co | PECO Trust III |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 81 | 81
PECO Energy Co | PECO Trust IV |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | 103 | 103
PECO Energy Co | Related Party |  |
Related Party Transaction [Line Items] |  |
Long-term debt to financing trusts | $ 184 | $ 184

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