Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended			24 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Quarterly Financial Data [Line Items]
Total operating revenue	$ 2,970	$ 3,741	$ 2,812	$ 2,824	$ 3,009	$ 4,269	$ 2,815	$ 2,564	$ 12,347	$ 12,657	$ 12,320
Operating (loss) income	287	636	500	352	(2,041)	739	420	330	1,775	(552)	1,456
Net income (loss)									1,405	(316)	668
Income (loss) from continuing operations	173	502	422	308	(1,434)	544	298	242	1,405	(350)	668
Income from discontinued operations, net	0	0	0	0	34	0	0	0	0	$ 34	$ 0
Net (loss) income attributable to common shareholders	$ 143	$ 471	$ 392	$ 278	$ (1,430)	$ 513	$ 276	$ 218	$ 1,284
Basic earnings (loss) per share – continuing operations:
Continuing operations (in dollars per share)	$ 0.40	$ 1.36	$ 1.20	$ 0.85	$ (4.49)	$ 1.57	$ 0.85	$ 0.67	$ 3.78	$ (1.40)	$ 1.73
Discontinued operations (in dollars per share)	0	0	0	0	0.10	0	0	0	0	0.10	0
Basic earnings per common share attributable to Edison International common shareholders (in dollars per share)	0.40	1.36	1.20	0.85	(4.39)	1.57	0.85	0.67	3.78	(1.30)	1.73
Diluted earnings (loss) per share – continuing operations:
Continuing operations (in dollars per share)	0.40	1.35	1.20	0.85	(4.49)	1.57	0.84	0.67	3.77	(1.40)	1.72
Diluted earnings (loss) per share – discontinued operations (in dollars per share)	0	0	0	0	0.10	0	0	0	0	0.10	0
Diluted earnings per common share attributable to Edison International common shareholders (in dollars per share)	0.40	1.35	1.20	0.85	(4.39)	1.57	0.84	0.67	3.77	(1.30)	1.72
Dividends declared per common share (in dollars per share)	$ 0.6375	$ 0.6125	$ 0.6125	$ 0.6125	$ 0.6125	$ 0.6050	$ 0.6050	$ 0.6050	$ 2.4750	$ 2.4275	$ 2.2325
SCE
Quarterly Financial Data [Line Items]
Total operating revenue	$ 2,958	$ 3,732	$ 2,800	$ 2,816	$ 2,994	$ 4,260	$ 2,803	$ 2,554	$ 12,306	$ 12,611	$ 12,254
Operating (loss) income	325	649	513	358	(2,013)	754	439	414	1,845	(406)	1,547
Net income (loss)	224	534	449	323	(1,399)	567	327	316	1,530	(189)	1,136
Net (loss) income attributable to common shareholders	194	503	419	293	(1,429)	536	297	286	$ 1,409	$ (310)	$ 1,012
Diluted earnings (loss) per share – continuing operations:
Dividends declared per common share (in dollars per share)									$ 1.3797	$ 1.3245	$ 1.8051
Common dividends declared	200	$ 200	$ 0	$ 200	0	$ 264	$ 100	$ 212
2017/2018 Wildfire/Mudslide Events
Diluted earnings (loss) per share – continuing operations:
Wildfire-related claims, net of expected recoveries									$ 232
2017/2018 Wildfire/Mudslide Events | SCE
Diluted earnings (loss) per share – continuing operations:
Wildfire-related claims, net of expected recoveries	$ 232				$ 2,500				$ 232	$ 4,669		$ 4,900