Schedule I - Condensed Financial Information of Parent (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Assets:
Cash and cash equivalents	$ 96,000,000			$ 161,000,000	$ 161,000,000			$ 132,000,000	$ 161,000,000	$ 132,000,000	$ 146,000,000	$ 96,000,000	$ 161,000,000	$ 132,000,000	$ 146,000,000
Other current assets												281,000,000	251,000,000
Total current assets												2,123,000,000	2,654,000,000
Other long-term assets												415,000,000	360,000,000
Total assets												51,319,000,000	50,229,000,000
Liabilities and equity:
Short-term debt												1,307,000,000	695,000,000
Current portion of long-term debt												981,000,000	295,000,000
Other current liabilities												991,000,000	967,000,000
Total current liabilities												5,912,000,000	4,927,000,000
Long-term debt												10,175,000,000	10,883,000,000
Total equity												14,187,000,000	13,388,000,000	12,982,000,000	11,691,000,000
Total liabilities and equity												51,319,000,000	$ 50,229,000,000
Condensed Statements of Income:
Interest income from affiliates	2,884,000,000	$ 3,767,000,000	$ 2,777,000,000	2,440,000,000	2,341,000,000	$ 3,763,000,000	$ 2,908,000,000	2,512,000,000	11,869,000,000	11,524,000,000	13,413,000,000
Operating expenses and interest expense									9,777,000,000	9,516,000,000	10,941,000,000
Operating income (loss)	566,000,000	695,000,000	381,000,000	448,000,000	340,000,000	608,000,000	524,000,000	538,000,000	2,092,000,000	2,008,000,000	2,472,000,000
Income tax benefit									177,000,000	486,000,000	443,000,000
Income from continuing operations	347,000,000	451,000,000	310,000,000	305,000,000	(47,000,000)	405,000,000	406,000,000	318,000,000	1,413,000,000	1,082,000,000	1,536,000,000
Income from discontinued operations, net of tax	13,000,000	0	(2,000,000)	1,000,000	(8,000,000)	43,000,000	0	0	12,000,000	35,000,000	185,000,000
Condensed Statements of Comprehensive Income
Other comprehensive income (loss), net of tax									3,000,000	2,000,000	(45,000,000)
Comprehensive income									1,314,000,000	1,022,000,000	1,567,000,000
Condensed Statements of Cash Flows:
Net cash provided by (used in) operating activities									3,256,000,000	4,509,000,000	3,248,000,000
Cash flows from financing activities:
Long-term debt issued									397,000,000	1,420,000,000	494,000,000
Short-term debt financing, net									611,000,000	(572,000,000)	1,079,000,000
Dividends paid									(626,000,000)	(544,000,000)	(463,000,000)
Net cash (used in) provided by financing activities									95,000,000	(588,000,000)	645,000,000
Net cash used in investing activities									(3,416,000,000)	(3,892,000,000)	(3,907,000,000)
Net (decrease) increase in cash and cash equivalents									(65,000,000)	29,000,000	(14,000,000)
Cash and cash equivalents, beginning of year				161,000,000				132,000,000	161,000,000	132,000,000	146,000,000
Cash and cash equivalents, end of year	96,000,000				161,000,000				96,000,000	161,000,000	132,000,000
Senior Notes Due 2017
Debt and Credit Agreements
Interest rate on debt (as a percent)													3.75%
Multi-year credit facilities
Debt and Credit Agreements
Commitment												$ 1,250,000,000
Weighted average interest rate (as a percent)												0.97%	0.78%
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)												$ (538,000,000)	$ (646,000,000)
Amount available												712,000,000
Senior notes | 2.95% Senior notes due 2023
Debt and Credit Agreements
Debt, face amount				$ 400,000,000
Interest rate on debt (as a percent)				2.95%
Edison International
Assets:
Cash and cash equivalents	6,000,000			$ 7,000,000	7,000,000			8,000,000	7,000,000	8,000,000	13,000,000	6,000,000	7,000,000	8,000,000	13,000,000
Other current assets												261,000,000	259,000,000
Total current assets												267,000,000	266,000,000
Investments in subsidiaries												13,459,000,000	12,696,000,000
Deferred income taxes												646,000,000	626,000,000
Other long-term assets												108,000,000	110,000,000
Total assets												14,480,000,000	13,698,000,000
Liabilities and equity:
Short-term debt												539,000,000	646,000,000
Current portion of long-term debt												400,000,000	214,000,000
Other current liabilities												484,000,000	368,000,000
Total current liabilities												1,423,000,000	1,228,000,000
Long-term debt												397,000,000	398,000,000
Other long-term liabilities												664,000,000	704,000,000
Total equity												11,996,000,000	11,368,000,000
Total liabilities and equity												14,480,000,000	13,698,000,000
Condensed Statements of Income:
Interest income from affiliates									6,000,000	3,000,000	3,000,000
Operating expenses and interest expense									86,000,000	78,000,000	94,000,000
Operating income (loss)									(80,000,000)	(75,000,000)	(91,000,000)
Equity in earnings of subsidiaries									1,337,000,000	1,025,000,000	1,482,000,000
Income before income taxes									1,257,000,000	950,000,000	1,391,000,000
Income tax benefit									(42,000,000)	(35,000,000)	(36,000,000)
Income from continuing operations									1,299,000,000	985,000,000	1,427,000,000
Income from discontinued operations, net of tax									12,000,000	35,000,000	185,000,000
Net income									1,311,000,000	1,020,000,000	1,612,000,000
Condensed Statements of Comprehensive Income
Net income									1,311,000,000	1,020,000,000	1,612,000,000
Other comprehensive income (loss), net of tax									3,000,000	2,000,000	(45,000,000)
Comprehensive income									1,314,000,000	1,022,000,000	1,567,000,000
Condensed Statements of Cash Flows:
Net cash provided by (used in) operating activities									493,000,000	641,000,000	(73,000,000)
Cash flows from financing activities:
Long-term debt issued									400,000,000	0	0
Long-term debt issuance costs									(3,000,000)	0	0
Payable due to affiliates									34,000,000	54,000,000	66,000,000
Short-term debt financing, net									(108,000,000)	26,000,000	584,000,000
Settlements of stock-based compensation, net									(44,000,000)	(42,000,000)	(24,000,000)
Dividends paid									(626,000,000)	(544,000,000)	(463,000,000)
Net cash (used in) provided by financing activities									(347,000,000)	(506,000,000)	163,000,000
Capital contributions to affiliate									(147,000,000)	(30,000,000)	(35,000,000)
Loans to affiliate									0	(106,000,000)	(60,000,000)
Net cash used in investing activities									(147,000,000)	(136,000,000)	(95,000,000)
Net (decrease) increase in cash and cash equivalents									(1,000,000)	(1,000,000)	(5,000,000)
Cash and cash equivalents, beginning of year				7,000,000				8,000,000	7,000,000	8,000,000	13,000,000
Cash and cash equivalents, end of year	6,000,000				7,000,000				6,000,000	7,000,000	8,000,000
Basis of Presentation
Cash dividends received from consolidated subsidiaries									701,000,000	758,000,000	378,000,000
Related Party Transactions
Current receivables due from affiliates												262,000,000	252,000,000
Current payables due to affiliates												221,000,000	149,000,000
Long-term receivables due from affiliate												103,000,000	105,000,000
Long-term payables due to affiliates												$ 243,000,000	213,000,000
Edison International | Senior Notes Due 2017
Debt and Credit Agreements
Interest rate on debt (as a percent)												3.75%
Senior notes												$ 400,000,000	400,000,000
Edison International | Credit Facility July 2020
Debt and Credit Agreements
Commitment		1,250,000,000
Edison International | Revolving credit facility maturing in July 2018
Debt and Credit Agreements
Amount available												$ 712,000,000
Covenant requirement, consolidated debt to total capitalization, ratio												0.65
Consolidated debt to total capitalization, ratio												0.47
Edison International | SCE
Related Party Transactions
Expenses from services provided by SCE									3,000,000	3,000,000	3,000,000
Interest expense from loans due to affiliates									3,000,000	6,000,000	1,000,000
SCE
Assets:
Cash and cash equivalents	39,000,000			26,000,000	26,000,000			38,000,000	26,000,000	38,000,000	54,000,000	$ 39,000,000	26,000,000	38,000,000	54,000,000
Other current assets												262,000,000	234,000,000
Total current assets												2,031,000,000	2,443,000,000
Other long-term assets												231,000,000	239,000,000
Total assets												50,891,000,000	49,795,000,000
Liabilities and equity:
Short-term debt												769,000,000	49,000,000
Current portion of long-term debt												579,000,000	79,000,000
Other current liabilities												729,000,000	760,000,000
Total current liabilities												4,707,000,000	3,821,000,000
Long-term debt												9,754,000,000	10,460,000,000
Total equity												14,483,000,000	13,672,000,000	$ 13,282,000,000	$ 12,138,000,000
Total liabilities and equity												50,891,000,000	$ 49,795,000,000
Condensed Statements of Income:
Interest income from affiliates	2,874,000,000	3,752,000,000	2,768,000,000	2,435,000,000	2,319,000,000	3,757,000,000	2,901,000,000	2,508,000,000	11,830,000,000	11,485,000,000	13,380,000,000
Operating expenses and interest expense									9,613,000,000	9,405,000,000	10,851,000,000
Operating income (loss)	594,000,000	$ 721,000,000	$ 429,000,000	472,000,000	366,000,000	$ 626,000,000	$ 536,000,000	550,000,000	2,217,000,000	2,080,000,000	2,529,000,000
Income tax benefit									256,000,000	507,000,000	474,000,000
Condensed Statements of Comprehensive Income
Other comprehensive income (loss), net of tax									2,000,000	6,000,000	(17,000,000)
Condensed Statements of Cash Flows:
Net cash provided by (used in) operating activities									3,523,000,000	4,624,000,000	3,660,000,000
Cash flows from financing activities:
Long-term debt issued									0	1,413,000,000	498,000,000
Short-term debt financing, net									719,000,000	(619,000,000)	490,000,000
Dividends paid									(824,000,000)	(874,000,000)	(489,000,000)
Net cash (used in) provided by financing activities									(219,000,000)	(812,000,000)	181,000,000
Net cash used in investing activities									(3,291,000,000)	(3,824,000,000)	(3,857,000,000)
Net (decrease) increase in cash and cash equivalents									13,000,000	(12,000,000)	(16,000,000)
Cash and cash equivalents, beginning of year				$ 26,000,000				$ 38,000,000	26,000,000	38,000,000	54,000,000
Cash and cash equivalents, end of year	$ 39,000,000				$ 26,000,000				$ 39,000,000	$ 26,000,000	$ 38,000,000
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)									13 months
Period for calculation of weighted average common equity component (months)									13 months
Weighted-average common equity component of total capitalization (as a percent)									50.40%
Capacity to pay additional dividends									$ 585,000,000
Restriction on net assets												13,900,000,000
SCE | Multi-year credit facilities
Debt and Credit Agreements
Commitment												2,750,000,000
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)												(769,000,000)
Amount available												$ 1,890,000,000