Debt and Credit Agreements - Summary of Basis Spread (Details)	12 Months Ended
	Dec. 31, 2023
Prime Rate | Corporate, Non-Segment
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.275%
Prime Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Prime Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.275%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Corporate, Non-Segment
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.275%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.90%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.275%
Commonwealth Edison Co | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Commonwealth Edison Co | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
PECO Energy Co | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.00%
PECO Energy Co | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.90%
Baltimore Gas and Electric Company | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Baltimore Gas and Electric Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.90%
Potomac Electric Power Company | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.075%
Potomac Electric Power Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.075%
Delmarva Power & Light Company | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Delmarva Power & Light Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Atlantic City Electric Company | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Atlantic City Electric Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%