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Commitments and Contingencies - Schedule of PHI Merger Commitments (Details)
$ in Millions
Dec. 31, 2022
USD ($)
PHI Merger Commitments [Line Items]  
Other Commitment $ 631
PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 513
Pepco Holdings LLC [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 125
Pepco Holdings LLC [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 320
Potomac Electric Power Company [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 94
Potomac Electric Power Company [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 120
Delmarva Power & Light Company [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 19
Delmarva Power & Light Company [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 89
Atlantic City Electric Company [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 12
Atlantic City Electric Company [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 111
Remaining Commitment [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 52
Remaining Commitment [Member] | Pepco Holdings LLC [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 45
Remaining Commitment [Member] | Potomac Electric Power Company [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 39
Remaining Commitment [Member] | Delmarva Power & Light Company [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment 4
Remaining Commitment [Member] | Atlantic City Electric Company [Member] | PEPCO Holdings Inc [Member]  
PHI Merger Commitments [Line Items]  
Other Commitment $ 2