Commitments and Contingencies - Schedule of PHI Merger Commitments (Details) $ in Millions	Dec. 31, 2024 USD ($)
PHI Merger Commitments [Line Items]
Other Commitment	$ 733
PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	513
Pepco Holdings LLC
PHI Merger Commitments [Line Items]
Other Commitment	203
Pepco Holdings LLC | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	320
Potomac Electric Power Company
PHI Merger Commitments [Line Items]
Other Commitment	174
Potomac Electric Power Company | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	120
Delmarva Power & Light Company
PHI Merger Commitments [Line Items]
Other Commitment	17
Delmarva Power & Light Company | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	89
Atlantic City Electric Company
PHI Merger Commitments [Line Items]
Other Commitment	12
Atlantic City Electric Company | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	111
Remaining Commitment [Member] | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	27
Remaining Commitment [Member] | Pepco Holdings LLC | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	24
Remaining Commitment [Member] | Potomac Electric Power Company | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	23
Remaining Commitment [Member] | Delmarva Power & Light Company | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	1
Remaining Commitment [Member] | Atlantic City Electric Company | PEPCO Holdings Inc
PHI Merger Commitments [Line Items]
Other Commitment	0
Guarantee Obligations [Member]
PHI Merger Commitments [Line Items]
Other Commitment	26
Guarantee Obligations [Member] | Pepco Holdings LLC
PHI Merger Commitments [Line Items]
Other Commitment	26
Guarantee Obligations [Member] | Potomac Electric Power Company
PHI Merger Commitments [Line Items]
Other Commitment	9
Guarantee Obligations [Member] | Delmarva Power & Light Company
PHI Merger Commitments [Line Items]
Other Commitment	10
Guarantee Obligations [Member] | Atlantic City Electric Company
PHI Merger Commitments [Line Items]
Other Commitment	$ 7