Variable Interest Entities (Textual) (Details) - Southern California Edison - VIE	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) MW	Jun. 30, 2019 USD ($) MW	Jun. 30, 2020 USD ($) MW	Jun. 30, 2019 USD ($) MW	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) $ / shares
SCE Power Purchase Contracts
Variable Interest Entity
Power generating capacity (in megawatts) | MW	6,583	4,874	6,583	4,874
Payments to unconsolidated VIEs for power purchase contracts	$ 150,000,000	$ 122,000,000	$ 301,000,000	$ 275,000,000
Trust II | Trust Securities
Variable Interest Entity
Security dividend rate									5.10%
Liquidation preference	400,000,000	400,000,000	400,000,000	400,000,000					$ 400,000,000
Liquidation value (in dollars per share) | $ / shares									$ 25
Common stock									$ 10,000
Redemption of trust securities			10,000	10,000
Trust II | Series G Preferred Stock
Variable Interest Entity
Security dividend rate									5.10%
Liquidation preference	400,000,000	400,000,000	400,000,000	400,000,000					$ 400,000,000
Liquidation value (in dollars per share) | $ / shares									$ 2,500
Trust III | Trust Securities
Variable Interest Entity
Security dividend rate								5.75%
Liquidation preference	275,000,000	275,000,000	275,000,000	275,000,000				$ 275,000,000
Liquidation value (in dollars per share) | $ / shares									25
Redemption of trust securities			10,000	10,000
Trust III | Series G Preferred Stock
Variable Interest Entity
Liquidation value (in dollars per share) | $ / shares									2,500
Trust III | Series H Preferred Stock
Variable Interest Entity
Security dividend rate								5.75%
Liquidation preference	275,000,000	275,000,000	275,000,000	275,000,000				$ 275,000,000
Trust IV | Trust Securities
Variable Interest Entity
Security dividend rate							5.375%
Liquidation preference	325,000,000	325,000,000	325,000,000	325,000,000			$ 325,000,000
Liquidation value (in dollars per share) | $ / shares									25
Redemption of trust securities			10,000	10,000
Trust IV | Series G Preferred Stock
Variable Interest Entity
Liquidation value (in dollars per share) | $ / shares									2,500
Trust IV | Series J Preferred Stock
Variable Interest Entity
Security dividend rate							5.375%
Liquidation preference	325,000,000	325,000,000	325,000,000	325,000,000			$ 325,000,000
Trust V | Trust Securities
Variable Interest Entity
Security dividend rate						5.45%
Liquidation preference	300,000,000	300,000,000	300,000,000	300,000,000		$ 300,000,000
Liquidation value (in dollars per share) | $ / shares									25
Redemption of trust securities			10,000	10,000
Trust V | Series G Preferred Stock
Variable Interest Entity
Liquidation value (in dollars per share) | $ / shares									2,500
Trust V | Series K Preferred Stock
Variable Interest Entity
Security dividend rate						5.45%
Liquidation preference	300,000,000	300,000,000	300,000,000	300,000,000		$ 300,000,000
Trust VI | Trust Securities
Variable Interest Entity
Security dividend rate					5.00%
Liquidation preference	475,000,000	475,000,000	475,000,000	475,000,000	$ 475,000,000
Liquidation value (in dollars per share) | $ / shares									25
Redemption of trust securities			10,000	10,000
Trust VI | Series G Preferred Stock
Variable Interest Entity
Liquidation value (in dollars per share) | $ / shares									$ 2,500
Trust VI | Series L Preferred Stock
Variable Interest Entity
Security dividend rate					5.00%
Liquidation preference	$ 475,000,000	$ 475,000,000	$ 475,000,000	$ 475,000,000	$ 475,000,000