Schedule I - Condensed Financial Information of Parent (Details) shares in Millions					1 Months Ended					3 Months Ended								6 Months Ended	12 Months Ended			24 Months Ended
	Jan. 01, 2020 USD ($)	Dec. 12, 2019 USD ($)	Aug. 02, 2019 USD ($)	Apr. 26, 2019 USD ($)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 USD ($)	Jul. 31, 2019 USD ($) shares	Jun. 30, 2019 USD ($)	Apr. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($)	May 31, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Assets:
Cash and cash equivalents	$ 68,000,000									$ 68,000,000			$ 144,000,000	$ 144,000,000				$ 68,000,000	$ 144,000,000	$ 144,000,000		$ 68,000,000	$ 68,000,000				$ 144,000,000
Other current assets																							107,000,000				78,000,000
Total current assets																							3,560,000,000				3,359,000,000
Other long-term assets																							2,363,000,000				2,445,000,000
Total assets																							64,382,000,000				56,715,000,000
Liabilities and equity:
Current portion of long-term debt																							479,000,000				79,000,000
Other current liabilities																							1,388,000,000				1,254,000,000
Total current liabilities																							5,523,000,000				5,395,000,000
Long-term debt																							17,864,000,000				14,632,000,000
Total equity																							15,496,000,000				12,652,000,000	$ 13,866,000,000	$ 14,187,000,000
Total liabilities and equity																							$ 64,382,000,000				56,715,000,000
Condensed Statements of Income:
Interest income from affiliates										2,970,000,000	$ 3,741,000,000	$ 2,812,000,000	2,824,000,000	3,009,000,000	$ 4,269,000,000	$ 2,815,000,000	$ 2,564,000,000		12,347,000,000	12,657,000,000	$ 12,320,000,000
Operating, interest and other expenses																			10,572,000,000	13,209,000,000	10,864,000,000
Operating income (loss)										287,000,000	636,000,000	500,000,000	352,000,000	(2,041,000,000)	739,000,000	420,000,000	330,000,000		1,775,000,000	(552,000,000)	1,456,000,000
Income tax (benefit) expense																			(278,000,000)	(739,000,000)	281,000,000
Income (loss) from continuing operations										173,000,000	502,000,000	422,000,000	308,000,000	(1,434,000,000)	544,000,000	298,000,000	242,000,000		1,405,000,000	(350,000,000)	668,000,000
Income from discontinued operations, net of tax										0	0	0	0	34,000,000	0	0	0		0	34,000,000	0
Net income (loss)																			1,284,000,000	(423,000,000)	565,000,000
Condensed Statements of Comprehensive Income
Net income (loss)																			1,284,000,000	(423,000,000)	565,000,000
Other comprehensive (loss) income, net of tax																			(9,000,000)	(7,000,000)	10,000,000
Comprehensive income (loss) attributable to Edison International																			1,275,000,000	(430,000,000)	575,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities																			(307,000,000)	3,177,000,000	3,597,000,000
Cash flows from financing activities:
Long-term debt issued																			3,696,000,000	3,237,000,000	2,233,000,000
Long-term debt repaid																			(82,000,000)	(654,000,000)	(1,285,000,000)
Common stock issued																			2,391,000,000	0	0
Short-term debt financing, net																			(172,000,000)	(1,611,000,000)	1,084,000,000
Payments for stock-based compensation																			(64,000,000)	(46,000,000)	(393,000,000)
Receipts from stock option exercises																			58,000,000	26,000,000	215,000,000
Dividends paid																			(810,000,000)	(788,000,000)	(707,000,000)
Net cash provided by financing activities																			4,903,000,000	82,000,000	1,007,000,000
Net cash used in investing activities																			(4,678,000,000)	(4,239,000,000)	(3,586,000,000)
Cash and cash equivalents, beginning of year	68,000,000												144,000,000						144,000,000
Cash and cash equivalents, end of year										68,000,000				144,000,000				68,000,000	68,000,000	144,000,000		68,000,000
Debt and Credit Agreements
Debt to total capitalization ratio																							0.70
Actual consolidated debt to total capitalization, ratio																							0.55
Equity [Abstract]
Preferred stock, shares issued | shares							32.2
Issuance of preference or common stock							$ 2,200,000,000			198,000,000									2,421,000,000		462,000,000
Offering expenses							52,000,000
Proceeds from sale of stock contributed to SCE							$ 1,900,000,000
Common stock issued																			2,391,000,000	0	0
Multi-year credit facilities
Debt and Credit Agreements
Amount available																							$ 1,500,000,000
SCE
Equity [Abstract]
Equity investment		$ 200,000,000	$ 1,200,000,000	$ 750,000,000	$ 450,000,000	$ 200,000,000		$ 450,000,000											3,250,000,000
Senior notes | 2.40% Senior notes due 2022
Debt and Credit Agreements
Interest rate on debt (as a percent)																							4.125%
Senior notes																							$ 550,000,000
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	15,000,000									15,000,000			97,000,000	97,000,000			524,000,000	15,000,000	97,000,000	97,000,000	6,000,000	15,000,000	15,000,000				97,000,000	524,000,000	6,000,000
Other current assets																							260,000,000				52,000,000
Total current assets																							275,000,000				149,000,000
Investments in subsidiaries																							16,530,000,000				12,521,000,000
Deferred income taxes																							608,000,000				516,000,000
Other long-term assets																							76,000,000				78,000,000
Total assets																							17,489,000,000				13,264,000,000
Liabilities and equity:
Current portion of long-term debt																							400,000,000				0
Other current liabilities																							481,000,000				498,000,000
Total current liabilities																							881,000,000				498,000,000
Long-term debt																							2,733,000,000				1,740,000,000
Other long-term liabilities																							572,000,000				567,000,000
Total equity																							13,303,000,000				10,459,000,000
Total liabilities and equity																							17,489,000,000				13,264,000,000
Condensed Statements of Income:
Interest income from affiliates																			5,000,000	0	0
Operating, interest and other expenses																			150,000,000	98,000,000	92,000,000
Operating income (loss)																			(145,000,000)	(98,000,000)	(92,000,000)
Equity in earnings (loss) of subsidiaries																			1,385,000,000	(376,000,000)	739,000,000
Income (loss) before income taxes																			1,240,000,000	(474,000,000)	647,000,000
Income tax (benefit) expense																			(44,000,000)	(17,000,000)	82,000,000
Income (loss) from continuing operations																			1,284,000,000	(457,000,000)	565,000,000
Income from discontinued operations, net of tax																			0	34,000,000	0
Net income (loss)																			1,284,000,000	(423,000,000)	565,000,000
Condensed Statements of Comprehensive Income
Net income (loss)																			1,284,000,000	(423,000,000)	565,000,000
Other comprehensive (loss) income, net of tax																			(9,000,000)	(7,000,000)	10,000,000
Comprehensive income (loss) attributable to Edison International																			1,275,000,000	(430,000,000)	575,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities																			181,000,000	785,000,000	462,000,000
Cash flows from financing activities:
Long-term debt issued																			1,399,000,000	549,000,000	798,000,000
Long-term debt issuance costs																			(9,000,000)	(4,000,000)	(5,000,000)
Long-term debt repaid																			0	0	(400,000,000)
Term loan issued																			1,000,000,000	0	0
Term loan repaid																			(1,000,000,000)	0	0
Common stock issued																			2,391,000,000	0	0
Payable due to affiliates																			5,000,000	13,000,000	8,000,000
Short-term debt financing, net																			(1,000,000)	(1,141,000,000)	600,000,000
Payments for stock-based compensation																			(27,000,000)	(24,000,000)	(260,000,000)
Receipts from stock option exercises																			39,000,000	14,000,000	144,000,000
Dividends paid																			(810,000,000)	(788,000,000)	(707,000,000)
Net cash provided by financing activities																			2,987,000,000	(1,381,000,000)	178,000,000
Capital contributions to affiliate																			(3,258,000,000)	(10,000,000)	(122,000,000)
Dividends from affiliate																			8,000,000	179,000,000	0
Net cash used in investing activities																			(3,250,000,000)	169,000,000	(122,000,000)
Net increase (decrease) in cash, cash equivalent and restricted cash																			(82,000,000)	(427,000,000)	518,000,000
Cash and cash equivalents, beginning of year	15,000,000												97,000,000				524,000,000		97,000,000	524,000,000	6,000,000	524,000,000
Cash and cash equivalents, end of year										15,000,000				97,000,000				15,000,000	15,000,000	97,000,000	524,000,000	15,000,000
Basis of Presentation
Cash dividends received from consolidated subsidiaries																			400,000,000	788,000,000	573,000,000
Equity [Abstract]
Common stock issued																			2,391,000,000	0	0
Related Party Transactions
Current receivables due from affiliates																							272,000,000				41,000,000
Current payables due to affiliates																							198,000,000				249,000,000
Long-term receivables due from affiliate																							73,000,000				73,000,000
Long-term payables due to affiliates																							$ 213,000,000				$ 213,000,000
Edison International Parent and Other | SCE
Related Party Transactions
Expenses from services provided by SCE																			2,000,000	2,000,000	3,000,000
Interest expense from loans due to affiliates																			5,000,000	5,000,000	5,000,000
Edison International Parent and Other | Senior notes | 5.75% Senior notes due 2027
Debt and Credit Agreements
Debt, face amount								$ 600,000,000				$ 600,000,000
Interest rate on debt (as a percent)								5.75%				5.75%
Edison International Parent and Other | Senior notes | 3.125% Senior notes due 2022
Debt and Credit Agreements
Debt, face amount																								$ 300,000,000
Interest rate on debt (as a percent)																								3.125%
Edison International Parent and Other | Senior notes | 3.550% Senior note due 2024
Debt and Credit Agreements
Debt, face amount																								$ 500,000,000
Interest rate on debt (as a percent)																								3.55%
Edison International Parent and Other | Senior notes | 2.125% Senior notes due 2020
Debt and Credit Agreements
Debt, face amount									$ 1,000,000,000.0
Interest rate on debt (as a percent)																							2.125%	2.125%			2.125%
Senior notes																							$ 400,000,000				$ 400,000,000
Basis points									0.90%
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																							400,000,000				0
Long-term debt																							2,732,000,000				1,740,000,000
Edison International Parent and Other | Multi-year credit facilities
Debt and Credit Agreements
Commitment								$ 1,500,000,000				$ 1,500,000,000
Outstanding borrowings (excluding discount)																							0				0
Amount available																							1,500,000,000
SCE
Assets:
Cash and cash equivalents	24,000,000									24,000,000			21,000,000	21,000,000				24,000,000	21,000,000	21,000,000		24,000,000	24,000,000				21,000,000
Other current assets																							103,000,000				69,000,000
Total current assets																							3,530,000,000				3,325,000,000
Other long-term assets																							1,507,000,000				1,360,000,000
Total assets																							64,273,000,000				56,574,000,000
Liabilities and equity:
Current portion of long-term debt																							79,000,000				79,000,000
Other current liabilities																							1,298,000,000				997,000,000
Total current liabilities																							5,059,000,000				5,146,000,000
Long-term debt																							15,132,000,000				12,892,000,000
Total equity																							17,827,000,000				13,785,000,000	$ 14,672,000,000	$ 14,483,000,000
Total liabilities and equity																							64,273,000,000				$ 56,574,000,000
Condensed Statements of Income:
Interest income from affiliates										2,958,000,000	3,732,000,000	2,800,000,000	2,816,000,000	2,994,000,000	4,260,000,000	2,803,000,000	2,554,000,000		12,306,000,000	12,611,000,000	12,254,000,000
Operating, interest and other expenses																			10,461,000,000	13,017,000,000	10,707,000,000
Operating income (loss)										325,000,000	$ 649,000,000	513,000,000	358,000,000	(2,013,000,000)	$ 754,000,000	$ 439,000,000	$ 414,000,000		1,845,000,000	(406,000,000)	1,547,000,000
Income tax (benefit) expense																			(229,000,000)	(696,000,000)	(30,000,000)
Condensed Statements of Comprehensive Income
Other comprehensive (loss) income, net of tax																			(11,000,000)	(4,000,000)	1,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities																			(91,000,000)	3,191,000,000	3,735,000,000
Cash flows from financing activities:
Long-term debt issued																			2,306,000,000	2,692,000,000	1,445,000,000
Long-term debt repaid																			(82,000,000)	(639,000,000)	(882,000,000)
Term loan issued																			750,000,000	0	0
Term loan repaid																			(750,000,000)	0	0
Short-term debt financing, net																			(171,000,000)	(520,000,000)	469,000,000
Payments for stock-based compensation																			(40,000,000)	(22,000,000)	(86,000,000)
Receipts from stock option exercises																			22,000,000	12,000,000	48,000,000
Dividends paid																			(521,000,000)	(909,000,000)	(697,000,000)
Net cash provided by financing activities																			4,771,000,000	616,000,000	243,000,000
Net cash used in investing activities																			(4,678,000,000)	(4,300,000,000)	(3,503,000,000)
Cash and cash equivalents, beginning of year	$ 24,000,000												$ 21,000,000						21,000,000
Cash and cash equivalents, end of year										$ 24,000,000				$ 21,000,000				$ 24,000,000	$ 24,000,000	$ 21,000,000		24,000,000
Basis of Presentation
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)																			48.00%	45.20%
Wildfire related charge incurred after tax																						$ 2,000,000,000.0
Spot rate equity ratio																											47.00%
Waiver threshold percent																			47.00%
Weighted-average common equity component of total capitalization percent																			48.50%
Capacity to pay additional dividends																			$ 179,000,000
Restriction on net assets																							$ 17,600,000,000
Weighted-average common equity component of total capitalization percent with CPUC waiver																			49.60%
Debt and Credit Agreements
Senior notes								$ 450,000,000				$ 450,000,000
Debt to total capitalization ratio																							0.65
Equity [Abstract]
Issuance of preference or common stock																					$ 462,000,000
SCE | SCE Term loan credit agreement
Debt and Credit Agreements
Debt, face amount																										$ 750,000,000
SCE | Multi-year credit facilities
Debt and Credit Agreements
Commitment																							$ 3,000,000,000.0
Outstanding borrowings (excluding discount)																							(550,000,000)
Amount available																							2,298,000,000
At-the-market Program (ATM)
Equity [Abstract]
Aggregate sale price																							$ 1,300,000,000		$ 1,500,000,000
Preferred stock, shares issued | shares										2.8
Offering expenses										$ 2,000,000
Internal programs
Equity [Abstract]
Preferred stock, shares issued | shares																		0.6
Common stock issued in lieu of distributing dividends																		$ 8,000,000
401(K)
Cash flows from financing activities:
Common stock issued																		$ 41,000,000
Equity [Abstract]
Preferred stock, shares issued | shares																		0.4
Common stock issued																		$ 41,000,000
In lieu of dividend payment
Cash flows from financing activities:
Common stock issued																		$ 22,000,000
Equity [Abstract]
Preferred stock, shares issued | shares																		0.1
Common stock issued																		$ 22,000,000
Subsequent event | SCE
Basis of Presentation
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)	52.00%
Debt proceeds contributed | SCE | SCE Term loan credit agreement
Debt and Credit Agreements
Related Party Transaction, Amounts of Transaction									$ 750,000,000