Equity (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 31, 2019
Class of Stock [Line Items]
Preferred stock, shares issued	32,200,000
Offering expenses	$ 52
Issuance of preference or common stock	2,200	$ 198			$ 2,421		$ 462
Common stock issued					2,391	$ 0	0
Wildfire Insurance Fund contributions					2,457	0	0
Southern California Edison Company
Class of Stock [Line Items]
Issuance of preference or common stock							462
Wildfire Insurance Fund contributions	$ 2,400		$ 2,400		$ 2,457	$ 0	$ 0
Southern California Edison Company | Cumulative preferred stock $100 par value
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 100		$ 100	$ 100
Preferred stock, shares authorized		12,000,000		12,000,000	12,000,000
Southern California Edison Company | Cumulative preferred stock $25 par value
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25		$ 25	$ 25
Preferred stock, shares authorized		24,000,000		24,000,000	24,000,000
Southern California Edison Company | No par value
Class of Stock [Line Items]
Preferred stock, shares authorized		50,000,000		50,000,000	50,000,000
Southern California Edison Company | Preferred and Preference Stock
Class of Stock [Line Items]
Preferred stock, shares issued					0	0	0
Preferred stock, shares redeemed					0	0	0
At-the-market Program (ATM)
Class of Stock [Line Items]
Aggregate sale price		$ 1,300		$ 1,300	$ 1,300			$ 1,500
Preferred stock, shares issued		2,800,000
Offering expenses		$ 2
Internal programs
Class of Stock [Line Items]
Preferred stock, shares issued				600,000
Common stock issued in lieu of distributing dividends				$ 8
401(K)
Class of Stock [Line Items]
Preferred stock, shares issued				400,000
Common stock issued				$ 41
In lieu of dividend payment
Class of Stock [Line Items]
Preferred stock, shares issued				100,000
Common stock issued				$ 22