Debt and Credit Agreements - Summary of Outstanding Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 49,038	$ 44,278
Unamortized debt discount and premium, net	(93)	(94)
Unamortized debt issuance costs	(369)	(326)
Fair value adjustment	502	542
Long-term debt due within one year	(1,665)	(1,453)
Corporate, Non-Segment
Debt Instrument [Line Items]
Long-term debt, gross	14,288	12,095
Unamortized debt discount and premium, net	24	24
Unamortized debt issuance costs	(96)	(71)
Fair value adjustment	129	141
Long-term debt due within one year	(750)	(807)
Long-term debt	13,547	11,334
First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 28,376	26,451
First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.20%
Long-term debt, maturity date	Jun. 15, 2026
First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.90%
Long-term debt, maturity date	Nov. 19, 2055
Senior unsecured notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 13,473	12,280
Senior unsecured notes | Corporate, Non-Segment
Debt Instrument [Line Items]
Long-term debt, gross	$ 13,288	12,095
Senior unsecured notes | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.75%
Long-term debt, maturity date	Apr. 15, 2026
Senior unsecured notes | Minimum | Corporate, Non-Segment
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.75%
Long-term debt, maturity date	Apr. 15, 2026
Senior unsecured notes | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.60%
Senior unsecured notes | Maximum | Corporate, Non-Segment
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.60%
Long-term debt, maturity date	Mar. 15, 2055
Unsecured notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 6,100	5,450
Unsecured notes | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.25%
Long-term debt, maturity date	Aug. 15, 2026
Unsecured notes | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.35%
Long-term debt, maturity date	Jun. 01, 2054
Notes payable and other
Debt Instrument [Line Items]
Long-term debt, gross	$ 79	83
Notes payable and other | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.64%
Long-term debt, maturity date	Dec. 31, 2025
Notes payable and other | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.49%
Long-term debt, maturity date	May 01, 2053
Junior subordinated notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,000	0
Junior subordinated notes | Corporate, Non-Segment
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,000	0
Junior subordinated notes | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.50%
Long-term debt, maturity date	Mar. 15, 2055
Junior subordinated notes | Maximum | Corporate, Non-Segment
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.50%
Long-term software licensing agreement
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	4
Long-term software licensing agreement | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.30%
Long-term debt, maturity date	Dec. 01, 2025
Medium-terms notes (unsecured)
Debt Instrument [Line Items]
Long-term debt, gross	$ 10	10
Medium-terms notes (unsecured) | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.72%
Long-term debt, maturity date	Feb. 01, 2027
ComEd Financing III Affiliate | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt	$ 206	206
ComEd Financing III Affiliate | Long-term debt to financing trusts | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.35%
Long-term debt, maturity date	Mar. 15, 2033
PECO Trust III Affiliate | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt	$ 81	81
PECO Trust III Affiliate | Long-term debt to financing trusts | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.38%
PECO Trust III Affiliate | Long-term debt to financing trusts | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.75%
Long-term debt, maturity date	Apr. 06, 2028
PECO Trust IV Affiliate | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt	$ 103	103
PECO Trust IV Affiliate | Long-term debt to financing trusts | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.75%
Long-term debt, maturity date	Jun. 15, 2033
Related Party | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt	$ 390	390
Nonrelated Party
Debt Instrument [Line Items]
Long-term debt	47,413	42,947
Commonwealth Edison Co
Debt Instrument [Line Items]
Long-term debt, gross	12,886	12,162
Unamortized debt discount and premium, net	(29)	(31)
Unamortized debt issuance costs	(104)	(101)
Long-term debt due within one year	(500)	0
Long-term debt	12,253	12,030
Commonwealth Edison Co | First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 12,879	12,154
Commonwealth Edison Co | First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.20%
Long-term debt, maturity date	Jun. 15, 2026
Commonwealth Edison Co | First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.45%
Long-term debt, maturity date	Jun. 01, 2055
Commonwealth Edison Co | Notes payable and other
Debt Instrument [Line Items]
Total finance lease liabilities	$ 7	8
Commonwealth Edison Co | Notes payable and other | Maximum
Debt Instrument [Line Items]
Long-term debt, maturity date	May 01, 2053
Lessee, finance lease, discount rate	7.49%
Commonwealth Edison Co | ComEd Financing III Affiliate | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt		206
Commonwealth Edison Co | ComEd Financing III Affiliate | Long-term debt to financing trusts | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.35%
Commonwealth Edison Co | Related Party
Debt Instrument [Line Items]
Long-term debt	$ 206	206
Commonwealth Edison Co | Nonrelated Party
Debt Instrument [Line Items]
Long-term debt	12,253	12,030
PECO Energy Co
Debt Instrument [Line Items]
Long-term debt, gross	6,475	5,775
Unamortized debt discount and premium, net	(25)	(25)
Unamortized debt issuance costs	(54)	(46)
Long-term debt due within one year	0	(350)
Long-term debt	6,396	5,354
PECO Energy Co | First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 6,475	5,775
PECO Energy Co | First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.80%
Long-term debt, maturity date	Jun. 15, 2033
PECO Energy Co | First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.95%
Long-term debt, maturity date	Sep. 15, 2055
PECO Energy Co | PECO Trust III Affiliate | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt	$ 81	81
PECO Energy Co | PECO Trust III Affiliate | Long-term debt to financing trusts | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.38%
PECO Energy Co | PECO Trust III Affiliate | Long-term debt to financing trusts | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.75%
Long-term debt, maturity date	Apr. 06, 2028
PECO Energy Co | PECO Trust IV Affiliate | Long-term debt to financing trusts
Debt Instrument [Line Items]
Long-term debt	$ 103	103
PECO Energy Co | PECO Trust IV Affiliate | Long-term debt to financing trusts | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.75%
Long-term debt, maturity date	Jun. 15, 2033
PECO Energy Co | Related Party
Debt Instrument [Line Items]
Long-term debt	$ 184	184
PECO Energy Co | Nonrelated Party
Debt Instrument [Line Items]
Long-term debt	6,396	5,354
Baltimore Gas and Electric Company
Debt Instrument [Line Items]
Long-term debt, gross	6,100	5,450
Unamortized debt discount and premium, net	(14)	(13)
Unamortized debt issuance costs	(45)	(42)
Long-term debt due within one year	(350)	0
Long-term debt	5,691	5,395
Baltimore Gas and Electric Company | Unsecured notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 6,100	5,450
Baltimore Gas and Electric Company | Unsecured notes | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.25%
Long-term debt, maturity date	Aug. 15, 2026
Baltimore Gas and Electric Company | Unsecured notes | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.35%
Long-term debt, maturity date	Jun. 01, 2054
Pepco Holdings LLC
Debt Instrument [Line Items]
Long-term debt, gross	$ 9,289	8,792
Total finance lease liabilities	72	75
Unamortized debt discount and premium, net	(2)	(2)
Unamortized debt issuance costs	(71)	(66)
Fair value adjustment	374	400
Long-term debt due within one year	(64)	(290)
Long-term debt	9,526	8,834
Pepco Holdings LLC | First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 9,022	8,522
Pepco Holdings LLC | First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.25%
Long-term debt, maturity date	Oct. 01, 2028
Pepco Holdings LLC | First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.90%
Long-term debt, maturity date	Nov. 19, 2055
Pepco Holdings LLC | Senior unsecured notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 185	185
Pepco Holdings LLC | Senior unsecured notes | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.45%
Long-term debt, maturity date	Aug. 15, 2032
Pepco Holdings LLC | Finance Leases
Debt Instrument [Line Items]
Total finance lease liabilities	$ 72	75
Pepco Holdings LLC | Finance Leases | Minimum
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 10, 2026
Pepco Holdings LLC | Finance Leases | Maximum
Debt Instrument [Line Items]
Long-term debt, maturity date	Sep. 10, 2033
Lessee, finance lease, discount rate	5.62%
Pepco Holdings LLC | Medium-terms notes (unsecured)
Debt Instrument [Line Items]
Long-term debt, gross	$ 10	10
Pepco Holdings LLC | Medium-terms notes (unsecured) | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.72%
Long-term debt, maturity date	Feb. 01, 2027
Potomac Electric Power Company
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,700	4,427
Total finance lease liabilities	25	27
Unamortized debt discount and premium, net	(1)	0
Unamortized debt issuance costs	(67)	(65)
Long-term debt due within one year	(6)	(6)
Long-term debt	4,626	4,356
Potomac Electric Power Company | First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,675	4,400
Potomac Electric Power Company | First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.32%
Long-term debt, maturity date	Jun. 13, 2029
Potomac Electric Power Company | First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.90%
Long-term debt, maturity date	Sep. 17, 2055
Potomac Electric Power Company | Finance Leases
Debt Instrument [Line Items]
Total finance lease liabilities	$ 25	27
Potomac Electric Power Company | Finance Leases | Minimum
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 10, 2026
Potomac Electric Power Company | Finance Leases | Maximum
Debt Instrument [Line Items]
Long-term debt, maturity date	Jul. 10, 2033
Lessee, finance lease, discount rate	5.62%
Delmarva Power & Light Company
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,361	2,236
Total finance lease liabilities	27	28
Unamortized debt discount and premium, net	0	0
Unamortized debt issuance costs	(17)	(16)
Long-term debt due within one year	(53)	(130)
Long-term debt	2,291	2,090
Delmarva Power & Light Company | First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,324	2,198
Delmarva Power & Light Company | First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.53%
Long-term debt, maturity date	Oct. 01, 2028
Delmarva Power & Light Company | First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.72%
Long-term debt, maturity date	Mar. 20, 2054
Delmarva Power & Light Company | Finance Leases
Debt Instrument [Line Items]
Total finance lease liabilities	$ 27	28
Delmarva Power & Light Company | Finance Leases | Minimum
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 10, 2026
Delmarva Power & Light Company | Finance Leases | Maximum
Debt Instrument [Line Items]
Long-term debt, maturity date	Sep. 10, 2033
Lessee, finance lease, discount rate	5.62%
Delmarva Power & Light Company | Medium-terms notes (unsecured)
Debt Instrument [Line Items]
Long-term debt, gross	$ 10	10
Delmarva Power & Light Company | Medium-terms notes (unsecured) | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.72%
Long-term debt, maturity date	Feb. 01, 2027
Atlantic City Electric Company
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,043	1,943
Total finance lease liabilities	20	20
Unamortized debt issuance costs	(10)	(10)
Long-term debt due within one year	(5)	(154)
Long-term debt	2,028	1,779
Atlantic City Electric Company | First Mortgage Bonds
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,023	1,923
Atlantic City Electric Company | First Mortgage Bonds | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.25%
Long-term debt, maturity date	Oct. 15, 2028
Atlantic City Electric Company | First Mortgage Bonds | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.81%
Long-term debt, maturity date	Nov. 19, 2055
Atlantic City Electric Company | Finance Leases
Debt Instrument [Line Items]
Total finance lease liabilities	$ 20	$ 20
Atlantic City Electric Company | Finance Leases | Minimum
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 10, 2026
Atlantic City Electric Company | Finance Leases | Maximum
Debt Instrument [Line Items]
Long-term debt, maturity date	Sep. 10, 2033
Lessee, finance lease, discount rate	5.62%