Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Line Items]
Total operating revenue	$ 3,220	$ 3,672	$ 2,965	$ 2,463	$ 2,884	$ 3,767	$ 2,777	$ 2,440	$ 12,320	$ 11,869	$ 11,524
Operating income (loss)	(16)	561	469	479	566	695	381	448	1,493	2,092	2,008
Net income (loss)									668	1,425	1,117
Income (loss) from continuing operations	(534)	501	309	392	347	451	310	305	668	1,413	1,082
Income (loss) from discontinued operations, net	0	0	0	0	13	0	(2)	1	0	12	35
Net income attributable to common shareholders	$ (545)	$ 470	$ 278	$ 362	$ 329	$ 421	$ 280	$ 281	$ 565	$ 1,311	$ 1,020
Basic earnings per share – continuing operations:
Continuing operations (in dollars per share)	$ (1.67)	$ 1.44	$ 0.85	$ 1.11	$ 0.97	$ 1.29	$ 0.87	$ 0.86	$ 1.73	$ 3.99	$ 3.02
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	0.04	0.00	(0.01)	0.00	0.00	0.03	0.11
Total (in dollars per share)	(1.67)	1.44	0.85	1.11	1.01	1.29	0.86	0.86	1.73	4.02	3.13
Diluted earnings per share – continuing operations:
Continuing operations (in dollars per share)	(1.66)	1.43	0.85	1.10	0.96	1.27	0.86	0.85	1.72	3.94	2.99
Diluted earnings (loss) per share – discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	0.04	0.00	(0.01)	0.00	0.00	0.03	0.11
Total (in dollars per share)	(1.66)	1.43	0.85	1.10	1.00	1.27	0.85	0.85	1.72	3.97	3.10
Dividends declared per common share (in dollars per share)	0.6050	0.5425	0.5425	0.5425	0.5425	0.4800	0.4800	0.4800	2.2325	1.9825	$ 1.7325
Common stock prices:
High (in dollars per share)	83.38	81.58	82.82	81.33	73.81	78.72	77.71	72.34	83.38	78.72
Low (in dollars per share)	62.67	76.38	77.21	70.57	67.44	71.31	67.71	57.97	62.67	57.97
Close (in dollars per share)	$ 63.24	$ 77.17	$ 78.19	$ 79.61	$ 71.99	$ 72.25	$ 77.67	$ 71.89	$ 63.24	$ 71.99
Impairment and other charges									$ 738	$ 21	$ 5
Edison International Parent and Other
Common stock prices:
Write-down for re-measurement of deferred taxes as a result of the Tax Cuts and Jobs Act	$ 433
SCE
Quarterly Financial Data [Line Items]
Total operating revenue	3,193	$ 3,652	$ 2,953	$ 2,456	$ 2,874	$ 3,752	$ 2,768	$ 2,435	12,254	11,830	11,485
Operating income (loss)	(4)	578	517	507	594	721	429	472	1,598	2,217	2,080
Net income (loss)	(79)	497	338	380	359	466	349	325	1,136	1,499	1,111
Net income attributable to common shareholders	(109)	465	307	349	328	435	318	295	1,012	1,376	998
Common stock prices:
Common dividends declared	212	$ 191	$ 191	$ 191	$ 191	$ 170	$ 170	$ 170	785	701
Impairment and other charges									$ 716	$ 0	$ 0
SCE | Revised San Onofre settlement agreement
Common stock prices:
Impairment and other charges	716
Impairment and other charges, net of tax	$ 448