Schedule I - Condensed Financial Information of Parent (Details)		1 Months Ended			3 Months Ended								12 Months Ended
	Feb. 28, 2019	Jul. 31, 2018 USD ($)	May 31, 2018 USD ($) extension	Jan. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Assets:
Cash and cash equivalents				$ 1,091,000,000	$ 144,000,000			$ 1,091,000,000	$ 1,091,000,000				$ 1,091,000,000	$ 1,091,000,000		$ 144,000,000		$ 1,091,000,000
Other current assets																78,000,000		202,000,000
Total current assets																3,359,000,000		3,729,000,000
Other long-term assets																2,445,000,000		374,000,000
Total assets																56,715,000,000		52,580,000,000
Liabilities and equity:
Short-term debt																720,000,000		2,393,000,000
Current portion of long-term debt																79,000,000		481,000,000
Other current liabilities																1,233,000,000		1,266,000,000
Total current liabilities																5,395,000,000		7,068,000,000
Long-term debt																14,632,000,000		11,642,000,000
Total equity																12,652,000,000		13,866,000,000	$ 14,187,000,000	$ 13,388,000,000
Total liabilities and equity																$ 56,715,000,000		52,580,000,000
Condensed Statements of Income:
Interest income from affiliates					3,009,000,000	$ 4,269,000,000	$ 2,815,000,000	2,564,000,000	3,220,000,000	$ 3,672,000,000	$ 2,965,000,000	$ 2,463,000,000	12,657,000,000	12,320,000,000	$ 11,869,000,000
Operating, interest and other expenses													13,209,000,000	10,864,000,000	9,807,000,000
Operating (loss) income					(2,041,000,000)	739,000,000	420,000,000	330,000,000	(38,000,000)	553,000,000	470,000,000	471,000,000	(552,000,000)	1,456,000,000	2,062,000,000
Income tax (benefit) expense													(739,000,000)	281,000,000	177,000,000
(Loss) income from continuing operations					(1,434,000,000)	544,000,000	298,000,000	242,000,000	(534,000,000)	501,000,000	309,000,000	392,000,000	(350,000,000)	668,000,000	1,413,000,000
Income from discontinued operations, net of tax					34,000,000	0	0	0	0	0	0	0	34,000,000	0	12,000,000
Condensed Statements of Comprehensive Income
Other comprehensive (loss) income, net of tax													(7,000,000)	10,000,000	3,000,000
Comprehensive (loss) income													(430,000,000)	575,000,000	1,314,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities													3,177,000,000	3,597,000,000	3,254,000,000
Cash flows from financing activities:
Long-term debt issued													3,237,000,000	2,233,000,000	397,000,000
Repayments of Long-term Debt													(654,000,000)	(1,285,000,000)	(220,000,000)
Short-term debt financing, net													(1,611,000,000)	1,084,000,000	611,000,000
Payments for stock-based compensation													(46,000,000)	(393,000,000)	(237,000,000)
Receipts from stock option exercises													26,000,000	215,000,000	135,000,000
Dividends paid													(788,000,000)	(707,000,000)	(626,000,000)
Net cash provided by (used in) financing activities													82,000,000	1,007,000,000	95,000,000
Net cash used in investing activities													(4,239,000,000)	(3,586,000,000)	(3,403,000,000)
Cash and cash equivalents, beginning of year				$ 1,091,000,000				1,091,000,000					1,091,000,000
Cash and cash equivalents, end of year					144,000,000				1,091,000,000				144,000,000	1,091,000,000
Debt and Credit Agreements
Number of one year extension options | extension			2
Covenant requirement, consolidated debt to total capitalization, ratio																0.70
Actual consolidated debt to total capitalization, ratio																0.55
Multi-year credit facilities
Debt and Credit Agreements
Commitment			$ 1,500,000,000													$ 1,500,000,000	$ 1,250,000,000
Outstanding borrowings (excluding discount)																0		$ (639,000,000)
Amount available																$ 1,500,000,000
Weighted average interest rate (as a percent)																		1.70%
Senior notes | 2.125% Senior notes due 2020
Debt and Credit Agreements
Debt, face amount								500,000,000
Basis points				1.00%
Senior notes | 2.40% Senior notes due 2022
Debt and Credit Agreements
Debt, face amount								$ 550,000,000
Interest rate on debt (as a percent)								4.125%
Senior notes | 2.95% Senior notes due 2023
Debt and Credit Agreements
Interest rate on debt (as a percent)																2.95%
Senior notes																$ 400,000,000
Edison International Parent and Other
Assets:
Cash and cash equivalents				$ 524,000,000	97,000,000			$ 524,000,000	524,000,000			6,000,000	524,000,000	6,000,000	7,000,000	97,000,000		$ 524,000,000	6,000,000	7,000,000
Other current assets																52,000,000		340,000,000
Total current assets																149,000,000		864,000,000
Investments in subsidiaries																12,521,000,000		13,659,000,000
Deferred income taxes																516,000,000		500,000,000
Other long-term assets																78,000,000		91,000,000
Total assets																13,264,000,000		15,114,000,000
Liabilities and equity:
Short-term debt																0		1,139,000,000
Other current liabilities																498,000,000		467,000,000
Total current liabilities																498,000,000		1,606,000,000
Long-term debt																1,740,000,000		1,193,000,000
Other long-term liabilities																567,000,000		644,000,000
Total equity																10,459,000,000		11,671,000,000
Total liabilities and equity																13,264,000,000		15,114,000,000
Condensed Statements of Income:
Interest income from affiliates													0	0	6,000,000
Operating, interest and other expenses													98,000,000	92,000,000	86,000,000
Operating (loss) income													(98,000,000)	(92,000,000)	(80,000,000)
Equity in (loss) earnings of subsidiaries													(376,000,000)	739,000,000	1,337,000,000
(Loss) income before income taxes													(474,000,000)	647,000,000	1,257,000,000
Income tax (benefit) expense													(17,000,000)	82,000,000	(42,000,000)
(Loss) income from continuing operations													(457,000,000)	565,000,000	1,299,000,000
Income from discontinued operations, net of tax													34,000,000	0	12,000,000
Net income													(423,000,000)	565,000,000	1,311,000,000
Condensed Statements of Comprehensive Income
Net (loss) income													(423,000,000)	565,000,000	1,311,000,000
Other comprehensive (loss) income, net of tax													(7,000,000)	10,000,000	3,000,000
Comprehensive (loss) income													(430,000,000)	575,000,000	1,314,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities													785,000,000	462,000,000	493,000,000
Cash flows from financing activities:
Long-term debt issued													549,000,000	798,000,000	400,000,000
Long-term debt issuance costs													(4,000,000)	(5,000,000)	(3,000,000)
Repayments of Long-term Debt													0	(400,000,000)	0
Payable due to affiliates													13,000,000	8,000,000	34,000,000
Short-term debt financing, net													(1,141,000,000)	600,000,000	(108,000,000)
Payments for stock-based compensation													(24,000,000)	(260,000,000)	(95,000,000)
Receipts from stock option exercises													14,000,000	144,000,000	51,000,000
Dividends paid													(788,000,000)	(707,000,000)	(626,000,000)
Net cash provided by (used in) financing activities													(1,381,000,000)	178,000,000	(347,000,000)
Capital contributions to affiliate													(10,000,000)	(122,000,000)	(147,000,000)
Dividends from affiliate													179,000,000	0	0
Net cash used in investing activities													169,000,000	(122,000,000)	(147,000,000)
Net increase (decrease) in cash, cash equivalent and restricted cash													(427,000,000)	518,000,000	(1,000,000)
Cash and cash equivalents, beginning of year				524,000,000				524,000,000				6,000,000	524,000,000	6,000,000	7,000,000
Cash and cash equivalents, end of year					97,000,000				524,000,000				97,000,000	524,000,000	6,000,000
Basis of Presentation
Cash dividends received from consolidated subsidiaries													788,000,000	573,000,000	701,000,000
Related Party Transactions
Current receivables due from affiliates																41,000,000		256,000,000
Current payables due to affiliates																249,000,000		235,000,000
Long-term receivables due from affiliate																73,000,000		81,000,000
Long-term payables due to affiliates																$ 213,000,000		$ 200,000,000
Edison International Parent and Other | SCE
Related Party Transactions
Expenses from services provided by SCE													2,000,000	3,000,000	3,000,000
Interest expense from loans due to affiliates													5,000,000	5,000,000	3,000,000
Edison International Parent and Other | Senior notes | 2.125% Senior notes due 2020
Debt and Credit Agreements
Interest rate on debt (as a percent)																2.125%		2.125%
Senior notes																$ 400,000,000		$ 400,000,000
Edison International Parent and Other | Senior notes | 2.40% Senior notes due 2022
Debt and Credit Agreements
Interest rate on debt (as a percent)																2.40%		2.40%
Senior notes																$ 400,000,000		$ 400,000,000
Edison International Parent and Other | Senior notes | 2.95% Senior notes due 2023
Debt and Credit Agreements
Interest rate on debt (as a percent)																		2.95%
Senior notes																		$ 400,000,000
Edison International Parent and Other
Liabilities and equity:
Current portion of long-term debt																0		2,000,000
Long-term debt																1,740,000,000		1,214,000,000
SCE
Assets:
Cash and cash equivalents				515,000,000	21,000,000			515,000,000	515,000,000				515,000,000	515,000,000		21,000,000		515,000,000
Other current assets																69,000,000		160,000,000
Total current assets																3,325,000,000		3,087,000,000
Other long-term assets																1,360,000,000		237,000,000
Total assets																56,574,000,000		51,515,000,000
Liabilities and equity:
Short-term debt																720,000,000		1,238,000,000
Current portion of long-term debt																79,000,000		479,000,000
Other current liabilities																975,000,000		1,225,000,000
Total current liabilities																5,146,000,000		5,887,000,000
Long-term debt																12,892,000,000		10,428,000,000
Total equity																13,785,000,000		14,672,000,000	14,483,000,000	$ 13,672,000,000
Total liabilities and equity																56,574,000,000		$ 51,515,000,000
Condensed Statements of Income:
Interest income from affiliates					2,994,000,000	4,260,000,000	2,803,000,000	2,554,000,000	3,193,000,000	3,652,000,000	2,953,000,000	2,456,000,000	12,611,000,000	12,254,000,000	11,830,000,000
Operating, interest and other expenses													13,017,000,000	10,707,000,000	9,648,000,000
Operating (loss) income					(2,013,000,000)	$ 754,000,000	$ 439,000,000	414,000,000	(28,000,000)	$ 569,000,000	$ 508,000,000	$ 498,000,000	(406,000,000)	1,547,000,000	2,182,000,000
Income tax (benefit) expense													(696,000,000)	(30,000,000)	256,000,000
Condensed Statements of Comprehensive Income
Other comprehensive (loss) income, net of tax													(4,000,000)	1,000,000	2,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities													3,191,000,000	3,735,000,000	3,521,000,000
Cash flows from financing activities:
Long-term debt issued													2,692,000,000	1,445,000,000	0
Repayments of Long-term Debt													(639,000,000)	(882,000,000)	(217,000,000)
Short-term debt financing, net													(520,000,000)	469,000,000	719,000,000
Payments for stock-based compensation													(22,000,000)	(86,000,000)	(127,000,000)
Receipts from stock option exercises													12,000,000	48,000,000	76,000,000
Dividends paid													(909,000,000)	(697,000,000)	(824,000,000)
Net cash provided by (used in) financing activities													616,000,000	243,000,000	(219,000,000)
Net cash used in investing activities													(4,300,000,000)	(3,503,000,000)	$ (3,294,000,000)
Cash and cash equivalents, beginning of year				$ 515,000,000				$ 515,000,000					515,000,000
Cash and cash equivalents, end of year					$ 21,000,000				$ 515,000,000				$ 21,000,000	515,000,000
Basis of Presentation
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)													48.00%
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)													37 months
Waiver threshold percent													47.00%
After-tax charge excused from capital structure		$ 448,000,000												$ 448,000,000
Weighted-average common equity component of total capitalization percent													49.70%
Capacity to pay additional dividends													$ 459,000,000
Restriction on net assets																13,300,000,000
SCE | Multi-year credit facilities
Debt and Credit Agreements
Commitment			$ 3,000,000,000													3,000,000,000	$ 2,750,000,000
Number of one year extension options | extension			2
Outstanding borrowings (excluding discount)																(721,000,000)
Amount available																$ 2,089,000,000
Line of credit
Debt and Credit Agreements
Weighted average interest rate (as a percent)																		2.56%
Line of credit | SCE
Debt and Credit Agreements
Weighted average interest rate (as a percent)																		2.46%
Subsequent event | SCE
Basis of Presentation
Weighted-average common equity component of total capitalization percent	47.00%
Commercial paper | SCE | Multi-year credit facilities
Debt and Credit Agreements
Outstanding borrowings (excluding discount)																		$ (738,000,000)
Weighted average interest rate (as a percent)																3.23%		1.75%
Common Stock
Basis of Presentation
Dividends declared but not paid																$ 200,000,000		$ 197,000,000	177,000,000
Common Stock | SCE
Basis of Presentation
Dividends declared but not paid																$ 0		$ 212,000,000	$ 0