Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 12,719	$ 12,652	$ 13,889	$ 13,866	$ 12,652	$ 13,866
Net income	422	308	298	245
Net income	422		298		730	540
Other comprehensive income	1	2	2	2
Contribution from tax equity investor			24
Cumulative effect of accounting changes							$ 0	$ 5
Common stock dividends declared	(200)	(200)	(197)	(197)
Dividends to noncontrolling interests	(30)	(30)	(30)	(30)
Stock-based compensation	(4)	(18)	(4)	(8)
Noncash stock-based compensation	5	5	6	5
Deconsolidation of SoCore Energy			(15)
Other			(1)	1
Balance, at the end of the period	$ 12,913	$ 12,719	$ 13,972	$ 13,889	12,913	13,972
Dividends declared per common share (in dollars per share)	$ 0.6125	$ 0.6125	$ 0.6050	$ 0.6050
Minimum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)	0.255	0.255	0.255	0.255
Preference stock dividends (in dollars per share)	15.625	15.625	15.625	15.625
Maximum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)	0.299	0.299	0.299	0.299
Preference stock dividends (in dollars per share)	$ 35.936	$ 35.936	$ 35.936	$ 35.936
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 2,550	$ 2,545	$ 2,531	$ 2,526	2,545	2,526
Noncash stock-based compensation	5	5	6	5
Balance, at the end of the period	2,555	2,550	2,537	2,531	2,555	2,537
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	(58)	(50)	(46)	(43)	(50)	(43)
Other comprehensive income	1	2	2	2
Cumulative effect of accounting changes							(10)	(5)
Balance, at the end of the period	(57)	(58)	(44)	(46)	(57)	(44)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	8,034	7,964	9,211	9,188	7,964	9,188
Net income	392	278	276	218
Cumulative effect of accounting changes							10	10
Common stock dividends declared	(200)	(200)	(197)	(197)
Stock-based compensation	(4)	(18)	(4)	(8)
Balance, at the end of the period	8,222	8,034	9,286	9,211	8,222	9,286
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	10,526	10,459	11,696	11,671	10,459	11,671
Net income	392	278	276	218
Other comprehensive income	1	2	2	2
Cumulative effect of accounting changes								5
Common stock dividends declared	(200)	(200)	(197)	(197)
Stock-based compensation	(4)	(18)	(4)	(8)
Noncash stock-based compensation	5	5	6	5
Balance, at the end of the period	10,720	10,526	11,779	11,696	10,720	11,779
Noncontrolling Interests, Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			0	2		2
Net income			(8)	(3)
Contribution from tax equity investor			24
Deconsolidation of SoCore Energy			(15)
Other			(1)	1
Balance, at the end of the period			0	0		0
Noncontrolling Interests, Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	2,193	2,193	2,193	2,193	2,193	2,193
Net income	30	30	30	30
Dividends to noncontrolling interests	(30)	(30)	(30)	(30)
Balance, at the end of the period	2,193	2,193	2,193	2,193	2,193	2,193
Southern California Edison
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	13,870	13,785	14,748	14,672	13,785	14,672
Net income	449	323	327	316	772	643
Other comprehensive income	1	1	1	2
Capital contribution from Edison International Parent					1,200
Cumulative effect of accounting changes							0	0
Common stock dividends declared		(200)	(100)	(212)
Dividends declared on preferred and preference stock	(30)	(30)	(30)	(30)
Stock-based compensation	(1)	(12)	(3)	(2)
Noncash stock-based compensation	3	3	3	2
Balance, at the end of the period	$ 15,492	$ 13,870	$ 14,946	$ 14,748	15,492	14,946
Dividends declared per common share (in dollars per share)		$ 0.4599	$ 0.2299	$ 0.4875
Southern California Edison | Minimum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)	$ 0.255	0.255	0.255	0.255
Preference stock dividends (in dollars per share)	15.625	15.625	15.625	15.625
Southern California Edison | Maximum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)	0.299	0.299	0.299	0.299
Preference stock dividends (in dollars per share)	$ 35.936	$ 35.936	$ 35.936	$ 35.936
Southern California Edison | Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 2,245	$ 2,245	$ 2,245	$ 2,245	2,245	2,245
Balance, at the end of the period	2,245	2,245	2,245	2,245	2,245	2,245
Southern California Edison | Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	2,168	2,168	2,168	2,168	2,168	2,168
Balance, at the end of the period	2,168	2,168	2,168	2,168	2,168	2,168
Southern California Edison | Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	683	680	673	671	680	671
Capital contribution from Edison International Parent					1,200
Noncash stock-based compensation	3	3	3	2
Balance, at the end of the period	1,886	683	676	673	1,886	676
Southern California Edison | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	(27)	(23)	(22)	(19)	(23)	(19)
Other comprehensive income	1	1	1	2
Cumulative effect of accounting changes							(5)	(5)
Balance, at the end of the period	(26)	(27)	(21)	(22)	(26)	(21)
Southern California Edison | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	8,801	8,715	9,684	9,607	8,715	9,607
Net income	449	323	327	316
Cumulative effect of accounting changes							$ 5	$ 5
Common stock dividends declared		(200)	(100)	(212)
Dividends declared on preferred and preference stock	(30)	(30)	(30)	(30)
Stock-based compensation	(1)	(12)	(3)	(2)
Noncash stock-based compensation					0
Balance, at the end of the period	$ 9,219	$ 8,801	$ 9,878	$ 9,684	$ 9,219	$ 9,878