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Retirement Benefits - Defined Contribution Savings Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	$ 25	$ 27	$ 76	$ 74
Commonwealth Edison Co
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	12	12	32	31
PECO Energy Co
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	3	3	11	10
Baltimore Gas and Electric Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	2	3	8	8
Pepco Holdings LLC
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	4	5	12	13
Potomac Electric Power Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	1	1	3	3
Delmarva Power and Light Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	1	1	3	3
Atlantic City Electric Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	$ 1	$ 1	$ 2	$ 2

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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-Topic 715
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+ References

No definition available.

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