Income Taxes - Schedule of Carryforwards and Corresponding Valuation Allowances (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	$ 468
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member] | PECO Energy Co [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member] | Baltimore Gas and Electric Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member] | Pepco Holdings LLC [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member] | Potomac Electric Power Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member] | Delmarva Power & Light Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] | General Business Tax Credit Carryforward [Member] | Atlantic City Electric Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	4,991
Deferred taxes on state tax attributes (net of federal taxes)	307
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 57
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2035
State and Local Jurisdiction [Member] | PECO Energy Co [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 970
Deferred taxes on state tax attributes (net of federal taxes)	37
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 4
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032
State and Local Jurisdiction [Member] | Baltimore Gas and Electric Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 1,142
Deferred taxes on state tax attributes (net of federal taxes)	72
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 0
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2033
State and Local Jurisdiction [Member] | Pepco Holdings LLC [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 1,501
Deferred taxes on state tax attributes (net of federal taxes)	104
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 33
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2029
State and Local Jurisdiction [Member] | Potomac Electric Power Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 50
Deferred taxes on state tax attributes (net of federal taxes)	3
Valuation allowance on state tax attributes (net of federal taxes)(b)	0
State and Local Jurisdiction [Member] | Delmarva Power & Light Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	768
Deferred taxes on state tax attributes (net of federal taxes)	52
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 32
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032
State and Local Jurisdiction [Member] | Atlantic City Electric Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 651
Deferred taxes on state tax attributes (net of federal taxes)	46
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 0
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2031