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Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 29, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Derivative [Line Items] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | $ (736) |  | $ (736) |  |  | $ (726)
Corporate, Non-Segment | Notes Payable to Banks |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | $ 1,700 |  |  |  |  |  |
Derivative, cash received on hedge | 30 |  |  |  |  |  |
PECO Energy Co |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Incremental collateral for loss of investment grade credit rating |  | 18 |  | 18 |  |  |
Baltimore Gas and Electric Company |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Incremental collateral for loss of investment grade credit rating |  | 37 |  | 37 |  |  |
Delmarva Power and Light Company |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Incremental collateral for loss of investment grade credit rating |  | 9 |  | 9 |  |  |
InterestRateSwapNotionalTerminated | Cash Flow Hedging |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | 1,300 |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 33 |  |  |  |  | $ 23 |
InterestRateSwapNotional5YR | Cash Flow Hedging |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 602 |  | 602 |  |  | 655
Derivative, term of contract |  | 5 years |  |  |  |  |
InterestRateSwapNotional5YR | Cash Flow Hedging | Corporate, Non-Segment |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 205 |  | 205 |  |  |
InterestRateSwapNotional10YR | Cash Flow Hedging |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 603 |  | 603 |  |  | 655
Derivative, term of contract |  | 10 years |  |  |  |  |
InterestRateSwapNotional10YR | Cash Flow Hedging | Corporate, Non-Segment |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 205 |  | 205 |  |  |
Interest Rate Swap | Cash Flow Hedging |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 1,205 |  | 1,205 |  |  | 1,310
Derivative, Gain (Loss) on Derivative, Net |  | 29 | $ 22 | 30 | $ 31 |  |
Derivative, Gain (Loss) on Derivative, Net |  | 29 | $ 22 | 30 | $ 31 |  |
Interest Rate Swap | Cash Flow Hedging | Corporate, Non-Segment |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 410 |  | $ 410 |  |  |
Interest Rate Cap | Economic Hedges |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | 1,000
Constant Maturity Treasury Interest Rate Swaps | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Total mark-to-market derivative liabilities |  |  |  |  |  |  | (22)
Constant Maturity Treasury Interest Rate Swaps | Not Designated as Hedging Instrument, Economic Hedge [Member] | 2023 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 4,875

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