Commitments and Contingencies (Contingencies) (Details) settlement in Thousands, plaintiff in Thousands, customer in Thousands			1 Months Ended						2 Months Ended	3 Months Ended	12 Months Ended		13 Months Ended	37 Months Ended	48 Months Ended
	Feb. 18, 2021 lawsuit plaintiff	Jan. 22, 2021 USD ($)	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) a structure injury	Oct. 31, 2019 a structure injury fatality	Jul. 31, 2019 USD ($)	Feb. 18, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) power_shut_off customer settlement	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2019 claim	Nov. 30, 2018 a structure fatality	Jan. 31, 2018 fatality	Jan. 01, 2018 fatality structure	Dec. 04, 2017 a structure fatality
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Estimated insurance recoveries				$ 708,000,000							$ 708,000,000			$ 708,000,000	$ 708,000,000
Loss contingency accrual				4,400,000,000							4,400,000,000			4,400,000,000	4,400,000,000
Settlement payments				1,800,000,000							1,800,000,000			1,800,000,000	1,800,000,000
Cumulative expected recoveries											89,000,000
2017/2018 Wildfire/Mudslide Events | Settlements executed after year end
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							2,200,000,000			2,200,000,000	2,200,000,000
2017/2018 Wildfire/Mudslide Events | Alleged and potential claims
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							2,200,000,000			2,200,000,000	2,200,000,000
2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingencies [Line Items]
Litigation settlement		$ 19,000,000
Woolsey Fire
Loss Contingencies [Line Items]
Loss contingency accrual				2,152,000,000							2,152,000,000			2,152,000,000	2,152,000,000
Woolsey Fire | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	243
Litigation settlement		2,212,000,000
Thomas and Koenigstein Fires | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	150
Thomas and Koenigstein Fires and Montecito Mudslides | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	40
San Onofre OII
Loss Contingencies [Line Items]
Lawsuits | claim																2
Wildfire Related Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate											1,328,000,000
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate						$ 1,300,000,000
Estimated recoveries						84,000,000
Wildfire-related charges						1,200,000,000
Wildfire-related charges, net of tax						874,000,000
Estimated insurance recoveries				708,000,000							708,000,000			708,000,000	708,000,000
Loss contingency accrual				4,400,000,000						$ 4,500,000,000	4,400,000,000	$ 4,500,000,000		4,400,000,000	4,400,000,000
Expected revenue from FERC customers				89,000,000							89,000,000			89,000,000	89,000,000
2019/2020 Wildfires
Loss Contingencies [Line Items]
Accrued estimated losses wildfire-related claims											117,000,000
Estimated insurance recoveries				75,000,000							$ 75,000,000			75,000,000	75,000,000
SCE
Loss Contingencies [Line Items]
High fire risk service area, percent											27.00%
PSPS | power_shut_off											12
Customers impacted by PSPS | customer											140
Wildfire-related charges											$ 1,213,000,000
Wildfire-related charges, net of tax											874,000,000
Wildfire insurance coverage												1,000,000,000.0	$ 1,200,000,000
Self insurance												10,000,000	$ 50,000,000
SCE | CPUC
Loss Contingencies [Line Items]
Requested increase rate amount				214,000,000				$ 505,000,000
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Estimated insurance recoveries				708,000,000							708,000,000			708,000,000	708,000,000
Loss contingency accrual				4,400,000,000							4,400,000,000			4,400,000,000	4,400,000,000
Settlement payments				1,800,000,000							1,800,000,000			1,800,000,000	1,800,000,000
Cumulative expected recoveries											$ 89,000,000
Number of plaintiffs | settlement											1
SCE | 2017/2018 Wildfire/Mudslide Events | Settlements executed after year end
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							$ 2,200,000,000			2,200,000,000	2,200,000,000
SCE | 2017/2018 Wildfire/Mudslide Events | Alleged and potential claims
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							2,200,000,000			2,200,000,000	2,200,000,000
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingencies [Line Items]
Litigation settlement		19,000,000
SCE | Woolsey Fire
Loss Contingencies [Line Items]
Loss contingency accrual				2,152,000,000							2,152,000,000			2,152,000,000	2,152,000,000
SCE | Woolsey Fire | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	301
Number of plaintiffs | plaintiff	6
Litigation settlement		$ 2,212,000,000
SCE | Thomas and Koenigstein Fires | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	295
Number of plaintiffs | plaintiff	4
SCE | Thomas and Koenigstein Fires and Montecito Mudslides | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	72
SCE | Thomas and Koenigstein Fires, class action | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	4
SCE | Wildfire Related Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate											1,328,000,000
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate						1,300,000,000					1,297,000,000	232,000,000		6,200,000,000
Estimated recoveries						84,000,000					84,000,000
Wildfire-related charges						1,200,000,000
Wildfire-related charges, net of tax						$ 874,000,000
Estimated insurance recoveries				708,000,000						1,710,000,000	708,000,000	1,710,000,000		708,000,000	708,000,000
Loss contingency accrual				4,383,000,000						4,541,000,000	4,383,000,000	4,541,000,000		4,383,000,000	4,383,000,000
Cumulative expected recoveries															233,000,000
Payment agreement for each dollar of claim					$ 0.555
Litigation settlement											300,000,000
Payments and settlements														4,100,000,000
Payments					$ 1,200,000,000					$ 360,000,000	1,455,000,000
Settlements and recoveries											1,002,000,000			1,300,000,000
Expected revenue from FERC customers				89,000,000							89,000,000			89,000,000	89,000,000
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingencies [Line Items]
Payment agreement for each dollar of claim			$ 0.67
Litigation settlement									$ 80,000,000
Payments			$ 2,200,000,000
SCE | December 2017 Wildfires
Loss Contingencies [Line Items]
Acres burned | a																				280,000
Structures destroyed | structure																				1,343
Fatalities | fatality																				2
SCE | December 2017 Wildfires | CPUC
Loss Contingencies [Line Items]
Requested increase rate amount								$ 6,000,000
SCE | November 2018 Wildfires
Loss Contingencies [Line Items]
Acres burned | a																	100,000
Structures damaged | structure																	364
Structures destroyed | structure																	1,643
Fatalities | fatality																	3
Additional fatalities | fatality																	2
Wildfire insurance coverage												1,000,000,000.0
Self insurance												$ 10,000,000
SCE | 2019/2020 Wildfires
Loss Contingencies [Line Items]
Self-Insurance retention											31,000,000
Self-Insurance retention, net of tax											21,000,000
Accrued estimated losses wildfire-related claims											117,000,000
Estimated insurance recoveries				$ 75,000,000							75,000,000			$ 75,000,000	$ 75,000,000
SCE | 2019/2020 Wildfires | FERC
Loss Contingencies [Line Items]
Estimated recoveries											$ 3,000,000
SCE | Saddle Ridge Fire
Loss Contingencies [Line Items]
Acres burned | a							9,000
Structures damaged | structure							88
Structures destroyed | structure							19
Number of injured | injury							8
Fatalities | fatality							1
SCE | Bobcat Fire
Loss Contingencies [Line Items]
Acres burned | a						116,000
Number of injured | injury						6
Estimated fire suppression costs						$ 80,000,000
SCE | Bobcat Fire | Home
Loss Contingencies [Line Items]
Structures damaged | structure						28
Structures destroyed | structure						87
SCE | Bobcat Fire | Commercial Property
Loss Contingencies [Line Items]
Structures destroyed | structure						1
SCE | Bobcat Fire | Minor Structures
Loss Contingencies [Line Items]
Structures damaged | structure						19
Structures destroyed | structure						83
SCE | Montecito Mudslides
Loss Contingencies [Line Items]
Structures damaged																		135	324
Fatalities | fatality																			21
Additional fatalities presumed | fatality																			2