Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data [Line Items]
Total operating revenue	$ 3,009	$ 4,269	$ 2,815	$ 2,564	$ 3,220	$ 3,672	$ 2,965	$ 2,463	$ 12,657	$ 12,320	$ 11,869
Operating (loss) income	(2,041)	739	420	330	(38)	553	470	471	(552)	1,456	2,062
Net (loss) income									(316)	668	1,425
Income (loss) from continuing operations	(1,434)	544	298	242	(534)	501	309	392	(350)	668	1,413
Income (loss) from discontinued operations, net	34	0	0	0	0	0	0	0	34	0	12
Net income (loss) attributable to common shareholders	$ (1,430)	$ 513	$ 276	$ 218	$ (545)	$ 470	$ 278	$ 362	$ (423)	$ 565	$ 1,311
Basic (loss) earnings per share – continuing operations:
Continuing operations (in dollars per share)	$ (4.49)	$ 1.57	$ 0.85	$ 0.67	$ (1.67)	$ 1.44	$ 0.85	$ 1.11	$ (1.40)	$ 1.73	$ 3.99
Discontinued operations (in dollars per share)	0.10	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.10	0.00	0.03
Total (in dollars per share)	(4.39)	1.57	0.85	0.67	(1.67)	1.44	0.85	1.11	(1.30)	1.73	4.02
Diluted (loss) earnings per share – continuing operations:
Continuing operations (in dollars per share)	(4.49)	1.57	0.84	0.67	(1.66)	1.43	0.85	1.10	(1.40)	1.72	3.94
Diluted earnings (loss) per share – discontinued operations (in dollars per share)	0.10	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.10	0.00	0.03
Total (in dollars per share)	(4.39)	1.57	0.84	0.67	(1.66)	1.43	0.85	1.10	(1.30)	1.72	3.97
Dividends declared per common share (in dollars per share)	$ 0.6125	$ 0.6050	$ 0.6050	$ 0.6050	$ 0.6050	$ 0.5425	$ 0.5425	$ 0.5425	$ 2.4275	$ 2.2325	$ 1.9825
Impairment and other									$ 78	$ 738	$ 21
Edison International Parent and Other
Diluted (loss) earnings per share – continuing operations:
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	$ 2,994	$ 4,260	$ 2,803	$ 2,554	3,193	$ 3,652	$ 2,953	$ 2,456	12,611	12,254	11,830
Operating (loss) income	(2,013)	754	439	414	(28)	569	508	498	(406)	1,547	2,182
Net (loss) income	(1,399)	567	327	316	(79)	497	338	380	(189)	1,136	1,499
Net income (loss) attributable to common shareholders	(1,429)	536	297	286	(109)	465	307	349	$ (310)	$ 1,012	$ 1,376
Diluted (loss) earnings per share – continuing operations:
Dividends declared per common share (in dollars per share)									$ 1.32	$ 1.81	$ 1.61
Common dividends declared	0	$ 264	$ 100	$ 212	212	$ 191	$ 191	$ 191	$ 576	$ 785
Impairment and other									(12)	$ 716	$ 0
SCE | Revised San Onofre settlement agreement
Diluted (loss) earnings per share – continuing operations:
Impairment and other					716
Impairment and other charges, net of tax					$ 448
2017/2018 Wildfire/Mudslide Events | SCE
Diluted (loss) earnings per share – continuing operations:
Wildfire-related claims, net of expected recoveries	$ 2,500								$ 2,534