Regulatory Matters - Schedule of Completed Rate Cases (Details) $ in Millions																						12 Months Ended	48 Months Ended
	Apr. 29, 2025 USD ($)	Mar. 20, 2025 USD ($)	Dec. 19, 2024 USD ($)	Dec. 12, 2024 USD ($)	Nov. 26, 2024 USD ($)	Oct. 31, 2024 USD ($) basisPoint	Sep. 11, 2024 USD ($)	Jun. 10, 2024 USD ($)	Apr. 18, 2024 USD ($)	Apr. 01, 2024 USD ($)	Mar. 28, 2024 USD ($)	Feb. 27, 2024 USD ($)	Feb. 23, 2024 USD ($)	Dec. 14, 2023 USD ($)	Nov. 17, 2023 USD ($)	Sep. 29, 2023 USD ($)	Aug. 21, 2023 USD ($)	Feb. 17, 2023 USD ($)	Jan. 17, 2023 USD ($)	Dec. 14, 2022 USD ($)	May 19, 2022 USD ($)	Feb. 28, 2025 USD ($)	Dec. 31, 2027 USD ($)
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)																			$ 1,487
Approved Revenue Requirement Increase (Decrease)			$ 1,045											$ 501
Approved Return on Equity, Percentage			8.905%
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case \| Forecast [Member]
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Approved Debt Capital Structure, Percentage																							50.00%
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case \| 2023 \| Forecast [Member]
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																							$ (986)
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)			$ 752
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)			80
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)			102
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case \| 2027
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)			$ 111
Commonwealth Edison Co \| Illinois 2024 Electric Distribution Reconciliation Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation							$ 624
Approved Revenue Requirement Increase (Decrease)						$ 623
Approved Return on Equity, Percentage						9.89%
Public Utilities, Approved Equity Capital Structure, Percentage						7.02%
Commonwealth Edison Co \| Illinois 2024 Electric Distribution Reconciliation Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Basis points for ComEd's Revenue Requirement \| basisPoint						0.0580
Commonwealth Edison Co \| Illinois 2024 RBA Reconciliation
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation		$ (55)
Commonwealth Edison Co \| Illinois 2024 MRP Reconciliation Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation	$ 268
PECO Energy Co \| Pennsylvania 2024 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)											$ 464
Approved Revenue Requirement Increase (Decrease)				$ 354
PECO Energy Co \| Pennsylvania 2024 Electric Distribution Base Rate Case \| Maximum [Member]
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities Approved Rate Increase (Decrease), Prior Year Annual Reconciliation				23
PECO Energy Co \| Pennsylvania 2024 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)				(64)
PECO Energy Co \| Pennsylvania 2024 Gas Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)											$ 111
Approved Revenue Requirement Increase (Decrease)				$ 78
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)																		$ 313
Approved Revenue Requirement Increase (Decrease)														$ 179
Approved Return on Equity, Percentage														9.50%
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)														$ 41
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)														113
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)														25
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)																		$ 289
Approved Revenue Requirement Increase (Decrease)														$ 229
Approved Return on Equity, Percentage														9.45%
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)														$ 126
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)														62
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Base Rate Case \| 2026
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)														$ 41
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2021
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																						$ 13
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2022
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																						39
Baltimore Gas and Electric Company \| Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2023
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)										$ 79
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Reconciliation Rate Case \| 2021
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																						7
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Reconciliation Rate Case \| 2022
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																						$ 15
Baltimore Gas and Electric Company \| Maryland 2023 Gas Distribution Reconciliation Rate Case \| 2023
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)										$ 73
Potomac Electric Power Company \| District of Columbia 2023 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount												$ 186
Approved Revenue Requirement Increase (Decrease)					$ 123
Approved Return on Equity, Percentage					9.50%
Potomac Electric Power Company \| District of Columbia 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)					$ 99
Potomac Electric Power Company \| District of Columbia 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)					$ 24
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount													$ 111
Approved Revenue Requirement Increase (Decrease)								$ 45
Approved Return on Equity, Percentage								9.50%
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)								$ 45
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount								80
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount								51
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Base Rate Case \| 2027
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount								14
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2022
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)								1
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2023
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)								7
Potomac Electric Power Company \| Pepco Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)								$ 31
Delmarva Power and Light Company \| Maryland 2022 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)																					$ 38
Approved Revenue Requirement Increase (Decrease)																				$ 29
Approved Return on Equity, Percentage																				9.60%
Delmarva Power and Light Company \| Maryland 2022 Electric Distribution Base Rate Case \| 2023
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																				$ 17
Delmarva Power and Light Company \| Maryland 2022 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																				6
Delmarva Power and Light Company \| Maryland 2022 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)																				$ 6
Delmarva Power and Light Company \| Delaware 2022 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount																$ 39
Approved Revenue Requirement Increase (Decrease)									$ 28
Approved Return on Equity, Percentage									9.60%
Delmarva Power and Light Company \| Delaware 2022 Electric Distribution Base Rate Case \| Minimum [Member]
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease) Annual Reconciliation									$ 5
Delmarva Power and Light Company \| Delaware 2022 Electric Distribution Base Rate Case \| Maximum [Member]
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease) Annual Reconciliation									$ 15
Atlantic City Electric Company \| New Jersey 2023 Electric Distribution Base Rate Case
Regulatory Matters Completed Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount																	$ 92
Approved Revenue Requirement Increase (Decrease)															$ 45
Approved Return on Equity, Percentage															9.60%
Atlantic City Electric Company \| New Jersey 2023 Electric Distribution Base Rate Case \| 2023
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)															$ 36
Atlantic City Electric Company \| New Jersey 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Completed Rate Cases [Line Items]
Approved Revenue Requirement Increase (Decrease)															$ 9