Edison International (EIX) 10-K 25 Feb 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 18, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-9936
Entity Registrant Name	EDISON INTERNATIONAL
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	95-4137452
Entity Address, Address Line One	2244 Walnut Grove Avenue
Entity Address, Address Line Two	(P.O. Box 976)
Entity Address, City or Town	Rosemead,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91770
City Area Code	(626)
Local Phone Number	302-2222
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	EIX
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 20.5
Entity Common Stock, Shares Outstanding		379,283,328
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Designated portions of the Edison International Proxy Statement relating to Edison International's 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.
Entity Central Index Key	0000827052
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
SCE
Entity Information [Line Items]
Entity File Number	1-2313
Entity Registrant Name	SOUTHERN CALIFORNIA EDISON COMPANY
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	95-1240335
Entity Address, Address Line One	2244 Walnut Grove Avenue
Entity Address, Address Line Two	(P.O. Box 800)
Entity Address, City or Town	Rosemead,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91770
City Area Code	(626)
Local Phone Number	302-1212
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		434,888,104
Entity Central Index Key	0000092103
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total operating revenue	$ 13,578	$ 12,347	$ 12,657
Purchased power and fuel	4,932	4,839	5,406
Operation and maintenance	3,609	3,018	2,797
Wildfire-related claims, net of insurance recoveries	1,328	255	2,669
Wildfire Insurance Fund expense	336	152	0
Depreciation and amortization	1,967	1,730	1,871
Property and other taxes	438	399	395
Impairment and other (income) expense	(116)	184	78
Gain on sale of lease interest and other operating income	(133)	(5)	(7)
Total operating expenses	12,361	10,572	13,209
Operating income (loss)	1,217	1,775	(552)
Interest expense	(902)	(841)	(734)
Other income	251	193	197
Income (loss) from continuing operations before income taxes	566	1,127	(1,089)
Income tax benefit	(305)	(278)	(739)
Income (loss) from continuing operations	871	1,405	(350)
Income from discontinued operations, net of tax	0	0	34
Net income (loss)	871	1,405	(316)
Preferred and preference stock dividend requirements of SCE	132	121	121
Other noncontrolling interests	0	0	(14)
Net income (loss)	739	1,284	(423)
Amounts attributable to Edison International common shareholders:
Income (loss) from continuing operations, net of tax	739	1,284	(457)
Income from discontinued operations, net of tax	0	0	34
Net income (loss) attributable to Edison International common shareholders	$ 739	$ 1,284	$ (423)
Basic earnings (loss) per common share attributable to Edison International common shareholders:
Weighted-average shares of common stock outstanding (in shares)	373	340	326
Continuing operations (in dollars per share)	$ 1.98	$ 3.78	$ (1.40)
Discontinued operations (in dollars per share)	0	0	0.10
Basic earnings (loss) per share (in dollars per share)	$ 1.98	$ 3.78	$ (1.30)
Diluted earnings (loss) per common share attributable to Edison International common shareholders:
Weighted-average shares of common stock outstanding, including effect of dilutive securities (in shares)	374	341	326
Continuing operations (in dollars per share)	$ 1.98	$ 3.77	$ (1.40)
Discontinued operations (in dollars per share)	0	0	0.10
Diluted earnings per common share attributable to Edison International common shareholders (in dollars per share)	$ 1.98	$ 3.77	$ (1.30)
SCE
Total operating revenue	$ 13,546	$ 12,306	$ 12,611
Purchased power and fuel	4,932	4,839	5,406
Operation and maintenance	3,523	2,936	2,702
Wildfire-related claims, net of insurance recoveries	1,328	255	2,669
Wildfire Insurance Fund expense	336	152	0
Depreciation and amortization	1,965	1,728	1,867
Property and other taxes	435	396	392
Impairment and other (income) expense	(150)	159	(12)
Other operating income	(1)	(4)	(7)
Total operating expenses	12,368	10,461	13,017
Operating income (loss)	1,178	1,845	(406)
Interest expense	(768)	(739)	(673)
Other income	255	195	194
Income (loss) from continuing operations before income taxes	665	1,301	(885)
Income tax benefit	(277)	(229)	(696)
Net income (loss)	942	1,530	(189)
Preferred and preference stock dividend requirements of SCE	132	121	121
Net income (loss) available for common stock	$ 810	$ 1,409	$ (310)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ 871	$ 1,405	$ (316)
Pension and postretirement benefits other than pensions:
Net loss arising during period plus amortization of net loss included in net income	0	(9)	(3)
Other	0	0	(4)
Other comprehensive loss, net of tax	0	(9)	(7)
Comprehensive income (loss)	871	1,396	(323)
Less: Comprehensive income attributable to noncontrolling interests	132	121	107
Comprehensive income (loss) attributable to Edison International	739	1,275	(430)
SCE
Net income (loss)	942	1,530	(189)
Pension and postretirement benefits other than pensions:
Net loss arising during period plus amortization of net loss included in net income	(2)	(11)	1
Other	0	0	(5)
Other comprehensive loss, net of tax	(2)	(11)	(4)
Comprehensive income (loss)	$ 940	$ 1,519	$ (193)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 87	$ 68
Receivables, less allowances for uncollectible accounts	1,130	788
Accrued unbilled revenue	521	488
Inventory	405	364
Insurance receivable	708	0
Income tax receivables	68	118
Prepaid expenses	281	214
Regulatory assets	1,314	1,009
Wildfire Insurance Fund contributions	323	323
Other current assets	224	188
Total current assets	5,061	3,560
Nuclear decommissioning trusts	4,833	4,562
Other investments	53	64
Total investments	4,886	4,626
Utility property, plant and equipment, less accumulated depreciation and amortization	47,653	44,198
Nonutility property, plant and equipment, less accumulated depreciation	186	87
Total property, plant and equipment	47,839	44,285
Regulatory assets	7,120	6,088
Wildfire Insurance Fund contributions	2,443	2,767
Operating lease right-of-use assets	1,088	693
Long-term insurance receivables	75	1,715
Other long-term assets	860	648
Total long-term assets	11,586	11,911
Total assets	69,372	64,382
LIABILITIES AND EQUITY
Short-term debt	2,398	550
Current portion of long-term debt	1,029	479
Accounts payable	1,980	1,752
Customer deposits	243	302
Regulatory liabilities	569	972
Current portion of operating lease liabilities	215	80
Wildfire-related claims	2,231	0
Other current liabilities	1,612	1,388
Total current liabilities	10,277	5,523
Long-term debt	19,632	17,864
Deferred income taxes and credits	5,368	5,078
Pensions and benefits	563	674
Asset retirement obligations	2,930	3,029
Regulatory liabilities	8,589	8,385
Operating lease liabilities	873	613
Wildfire-related claims		4,568
Other deferred credits and other long-term liabilities	2,910	3,152
Total deferred credits and other liabilities	23,514	25,499
Total liabilities	53,423	48,886
Commitments and contingencies (Note 12)
Common stock, no par value	5,962	4,990
Accumulated other comprehensive loss	(69)	(69)
Retained earnings	8,155	8,382
Total Edison International's common shareholders' equity	14,048	13,303
Noncontrolling interests – preferred and preference stock of SCE	1,901	2,193
Total equity	15,949	15,496
Total liabilities and equity	69,372	64,382
SCE
ASSETS
Cash and cash equivalents	55	24
Receivables, less allowances for uncollectible accounts	1,126	777
Accrued unbilled revenue	521	488
Inventory	405	364
Insurance receivable	440	0
Insurance receivable from affiliate	268	0
Income tax receivables	69	148
Prepaid expenses	280	213
Regulatory assets	1,314	1,009
Wildfire Insurance Fund contributions	323	323
Other current assets	216	184
Total current assets	5,017	3,530
Nuclear decommissioning trusts	4,833	4,562
Other investments	37	46
Total investments	4,870	4,608
Utility property, plant and equipment, less accumulated depreciation and amortization	47,653	44,198
Nonutility property, plant and equipment, less accumulated depreciation	180	83
Total property, plant and equipment	47,833	44,281
Regulatory assets	7,120	6,088
Wildfire Insurance Fund contributions	2,443	2,767
Operating lease right-of-use assets	1,085	689
Long-term insurance receivables	75	912
Long-term insurance receivables due from affiliate	0	803
Other long-term assets	843	595
Total long-term assets	11,566	11,854
Total assets	69,286	64,273
LIABILITIES AND EQUITY
Short-term debt	2,268	550
Current portion of long-term debt	1,029	79
Accounts payable	1,983	1,779
Customer deposits	243	302
Regulatory liabilities	569	972
Current portion of operating lease liabilities	214	79
Wildfire-related claims	2,231	0
Other current liabilities	1,294	1,298
Total current liabilities	9,831	5,059
Long-term debt	16,499	15,132
Deferred income taxes and credits	6,783	6,451
Pensions and benefits	144	237
Asset retirement obligations	2,930	3,029
Regulatory liabilities	8,589	8,385
Operating lease liabilities	871	610
Wildfire-related claims	2,281	4,568
Other deferred credits and other long-term liabilities	2,708	2,975
Total deferred credits and other liabilities	24,306	26,255
Total liabilities	50,636	46,446
Commitments and contingencies (Note 12)
Preferred and preference stock	1,945	2,245
Common stock, no par value	2,168	2,168
Additional paid-in capital	5,387	3,939
Accumulated other comprehensive loss	(41)	(39)
Retained earnings	9,191	9,514
Total equity	18,650	17,827
Total liabilities and equity	$ 69,286	$ 64,273

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Receivables, allowances for uncollectible accounts	$ 188	$ 50
Utility property, plant and equipment, accumulated depreciation	10,681	9,958
Nonutility property, plant and equipment, accumulated depreciation	$ 94	$ 86
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares issued (in shares)	378,907,147	361,985,133
Common stock, shares outstanding (in shares)	378,907,147	361,985,133
SCE
Receivables, allowances for uncollectible accounts	$ 188	$ 49
Utility property, plant and equipment, accumulated depreciation	10,681	9,958
Nonutility property, plant and equipment, accumulated depreciation	$ 86	$ 80
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	560,000,000	560,000,000
Common stock, shares issued (in shares)	434,888,104	434,888,104
Common stock, shares outstanding (in shares)	434,888,104	434,888,104

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 871	$ 1,405	$ (316)
Less: Income from discontinued operations	0	0	34
Income (loss) from continuing operations	871	1,405	(350)
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	2,029	1,803	1,940
Allowance for equity during construction	(121)	(101)	(104)
Impairment and other (income) expense	(116)	184	78
Gain on sale of lease interest and other operating income	(133)	(5)	(7)
Deferred income taxes	(296)	(284)	(527)
Wildfire Insurance Fund amortization expense	336	152	0
Other	36	34	42
Nuclear decommissioning trusts	(197)	(106)	(109)
Contributions to Wildfire Insurance Fund	(95)	(2,457)	0
Changes in operating assets and liabilities:
Receivables	(283)	(76)	(39)
Inventory	(43)	(83)	(49)
Accounts payable	87	288	(31)
Tax receivables and payables	113	88	32
Other current assets and liabilities	4	(13)	(79)
Regulatory assets and liabilities, net	(1,799)	(1,278)	(92)
Wildfire-related insurance receivable	932	285	(2,000)
Wildfire-related claims	(56)	(101)	4,669
Other noncurrent assets and liabilities	(6)	(42)	(197)
Net cash provided by operating activities	1,263	(307)	3,177
Cash flows from financing activities:
Long-term debt issued, net of discount and issuance costs	3,073	3,696	3,237
Long-term debt repaid or repurchased	(1,099)	(82)	(654)
Short-term debt borrowed	2,994	1,750	0
Short-term debt repaid	(1,126)	(1,750)	0
Common stock issued	912	2,391	0
Preferred and preference stock redeemed	(308)	0	0
Commercial paper and other short-term borrowing (repayments), net	304	(172)	(1,611)
Dividends and distribution to noncontrolling interests	(118)	(121)	(121)
Dividends paid	(928)	(810)	(788)
Other	23	1	19
Net cash provided by financing activities	3,727	4,903	82
Cash flows from investing activities:
Capital expenditures	(5,484)	(4,877)	(4,509)
Proceeds from sale of nuclear decommissioning trust investments	5,927	4,389	4,340
Purchases of nuclear decommissioning trust investments	(5,730)	(4,283)	(4,231)
Proceeds from sale of San Onofre nuclear fuel	158	11	3
Proceeds from sale of lease investment	132	0	0
Other	26	82	158
Net cash used in investing activities	(4,971)	(4,678)	(4,239)
Net increase (decrease) in cash, cash equivalents and restricted cash	19	(82)	(980)
Cash, cash equivalents and restricted cash at beginning of year	70	152	1,132
Cash, cash equivalents and restricted cash at end of year	89	70	152
SCE
Cash flows from operating activities:
Net income (loss)	942	1,530	(189)
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	2,021	1,798	1,931
Allowance for equity during construction	(121)	(101)	(104)
Impairment and other (income) expense	(150)	159	(12)
Deferred income taxes	(263)	(243)	(552)
Wildfire Insurance Fund amortization expense	336	152	0
Other	17	17	28
Nuclear decommissioning trusts	(197)	(106)	(109)
Contributions to Wildfire Insurance Fund	(95)	(2,457)	0
Changes in operating assets and liabilities:
Receivables	(290)	(89)	(45)
Inventory	(43)	(83)	(50)
Accounts payable	63	307	(43)
Tax receivables and payables	141	178	(84)
Other current assets and liabilities	(7)	(15)	(91)
Regulatory assets and liabilities, net	(1,799)	(1,278)	(92)
Wildfire-related insurance receivable	932	285	(2,000)
Wildfire-related claims	(56)	(101)	4,669
Other noncurrent assets and liabilities	(4)	(44)	(66)
Net cash provided by operating activities	1,427	(91)	3,191
Cash flows from financing activities:
Long-term debt issued, net of discount and issuance costs	2,676	2,306	2,692
Long-term debt repaid or repurchased	(699)	(82)	(639)
Short-term debt borrowed	2,194	750	0
Short-term debt repaid	(326)	(750)	0
Capital contributions from Edison International Parent	1,432	3,250	0
Preferred and preference stock redeemed	(308)	0	0
Commercial paper and other short-term borrowing (repayments), net	175	(171)	(520)
Dividends paid	(1,450)	(521)	(909)
Other	5	(11)	(8)
Net cash provided by financing activities	3,699	4,771	616
Cash flows from investing activities:
Capital expenditures	(5,480)	(4,876)	(4,491)
Proceeds from sale of nuclear decommissioning trust investments	5,927	4,389	4,340
Purchases of nuclear decommissioning trust investments	(5,730)	(4,283)	(4,231)
Proceeds from sale of San Onofre nuclear fuel	158	11	3
Other	31	81	79
Net cash used in investing activities	(5,094)	(4,678)	(4,300)
Net increase (decrease) in cash, cash equivalents and restricted cash	32	2	(493)
Cash, cash equivalents and restricted cash at beginning of year	24	22	515
Cash, cash equivalents and restricted cash at end of year	$ 56	$ 24	$ 22

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
(Discount), premium and issuance costs	$ 23	$ (4)	$ (63)
SCE
(Discount), premium and issuance costs	$ 26	$ 6	$ (58)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	SCE	Cumulative effect of accounting changes	Cumulative effect of accounting changesSCE	Common Stock	Preference stockSCE	Common StockSCE	Additional Paid-in CapitalSCE	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive LossSCE	Accumulated Other Comprehensive LossCumulative effect of accounting changes	Accumulated Other Comprehensive LossCumulative effect of accounting changesSCE	Retained Earnings	Retained EarningsSCE	Retained EarningsCumulative effect of accounting changes	Retained EarningsCumulative effect of accounting changesSCE	Equity Attributable to Common Shareholders	Equity Attributable to Common ShareholdersCumulative effect of accounting changes	Other	Noncontrolling Interest, Preferred and Preference Stock
Beginning balance at Dec. 31, 2017	$ 13,866	$ 14,672	$ 5	$ 0	$ 2,526	$ 2,245	$ 2,168	$ 671	$ (43)	$ (19)	$ (5)	$ (5)	$ 9,188	$ 9,607	$ 10	$ 5	$ 11,671	$ 5	$ 2	$ 2,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(189)												(189)
Net loss (income)	(313)												(423)				(423)		(11)	121
Other comprehensive income (loss)	(2)	1							(2)	1							(2)
Contribution from tax equity investor	24																		24
Dividends declared on common stock	(791)	(576)											(791)	(576)			(791)
Dividends declared on preferred and preference stock		(121)												(121)
Dividends to noncontrolling interests	(121)																			(121)
Stock-based compensation	(20)	(11)											(20)	(11)			(20)
Noncash stock-based compensation	19	9			19			9									19
Deconsolidation of SoCore Energy	(15)																		(15)
Ending balance at Dec. 31, 2018	12,652	13,785	$ 0	$ 0	2,545	2,245	2,168	680	(50)	(23)	$ (10)	$ (5)	7,964	8,715	$ 10	$ 5	10,459		0	2,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,530												1,530
Net loss (income)	1,405												1,284				1,284			121
Other comprehensive income (loss)	(9)	(11)							(9)	(11)							(9)
Capital contribution from Edison International Parent		3,250						3,250
Issuance of preference or common stock	2,421				2,421												2,421
Dividends declared on common stock	(849)	(600)											(849)	(600)			(849)
Dividends declared on preferred and preference stock		(121)												(121)
Dividends to noncontrolling interests	(121)																			(121)
Stock-based compensation	(27)	(18)						(3)					(27)	(15)			(27)
Noncash stock-based compensation	24	12			24			12									24
Ending balance at Dec. 31, 2019	15,496	17,827			4,990	2,245	2,168	3,939	(69)	(39)			8,382	9,514			13,303		0	2,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		942												942
Net loss (income)	871												739				739			132
Other comprehensive income (loss)		(2)								(2)
Capital contribution from Edison International Parent		1,432						1,432
Issuance of preference or common stock	942				942												942
Dividends declared on common stock	(965)	(1,132)											(965)	(1,132)			(965)
Dividends declared on preferred and preference stock		(117)												(117)
Dividends to noncontrolling interests	(117)																			(117)
Stock-based compensation		(5)						(5)
Noncash stock-based compensation	30	13			30			14					(1)	(1)			29			1
Redemption of preference stock	(308)	(308)				(300)		7						(15)						(308)
Ending balance at Dec. 31, 2020	$ 15,949	$ 18,650			$ 5,962	$ 1,945	$ 2,168	$ 5,387	$ (69)	$ (41)			$ 8,155	$ 9,191			$ 14,048		$ 0	$ 1,901

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends declared per common share (in dollars per share)	$ 2.5750	$ 2.4750	$ 2.4275
Noncontrolling interest | Minimum
Preferred stock dividends (in dollars per share)	0.757	1.020	1.020
Preference stock dividends (in dollars per share)	62.500	62.500	62.500
Noncontrolling interest | Maximum
Preferred stock dividends (in dollars per share)	0.886	1.195	1.195
Preference stock dividends (in dollars per share)	143.750	143.750	143.750
SCE
Dividends declared per common share (in dollars per share)	2.6030	1.3797	1.3245
SCE | Noncontrolling interest | Minimum
Preferred stock dividends (in dollars per share)	0.757	1.020	1.020
Preference stock dividends (in dollars per share)	62.500	62.500	62.500
SCE | Noncontrolling interest | Maximum
Preferred stock dividends (in dollars per share)	0.886	1.195	1.195
Preference stock dividends (in dollars per share)	$ 143.750	$ 143.750	$ 143.750

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Organization and Basis of Presentation Edison International is the parent holding company of Southern California Edison Company ("SCE") and Edison Energy Group, Inc. ("Edison Energy Group"). SCE is an investor-owned public utility primarily engaged in the business of supplying and delivering electricity to an approximately 50,000 square mile area of southern California. Edison Energy Group is a holding company for Edison Energy, LLC ("Edison Energy") which is engaged in the competitive business of providing data-driven energy solutions to commercial, institutional and industrial customers. Edison Energy's business activities are currently not material to report as a separate business segment. These combined notes to the consolidated financial statements apply to both Edison International and SCE unless otherwise described. Edison International's consolidated financial statements include the accounts of Edison International, SCE and other wholly owned and controlled subsidiaries. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to "Edison International Parent and Other" refer to Edison International Parent and its competitive subsidiaries and "Edison International Parent" refer to Edison International on a stand-alone basis, not consolidated with its subsidiaries. SCE's consolidated financial statements include the accounts of SCE and its wholly owned and controlled subsidiaries. All intercompany transactions have been eliminated from the consolidated financial statements. Edison International's and SCE's accounting policies conform to accounting principles generally accepted in the United States of America, including the accounting principles for rate-regulated enterprises, which reflect the ratemaking policies of the California Public Utility Commission ("CPUC") and the Federal Energy Regulatory Commission ("FERC"). SCE applies authoritative guidance for rate-regulated enterprises to the portion of its operations in which regulators set rates at levels intended to recover the estimated costs of providing service, plus a return on net investments in assets, or rate base. Regulators may also impose certain penalties or grant certain incentives. Due to timing and other differences in the collection of electric utility revenue, these principles require an incurred cost that would otherwise be charged to expense by a non-regulated entity to be capitalized as a regulatory asset if it is probable that the cost is recoverable through future rates; and conversely the principles require recording of a regulatory liability for amounts collected in rates to recover costs expected to be incurred in the future or amounts collected in excess of costs incurred and refundable to customers. In addition, SCE recognizes revenue and regulatory assets from alternative revenue programs, which enables the utility to adjust future rates in response to past activities or completed events, if certain criteria are met, even for programs that do not qualify for recognition of "traditional" regulatory assets and liabilities. SCE assesses, at the end of each reporting period, whether regulatory assets are probable of future recovery. See Note 11 for composition of regulatory assets and liabilities. The preparation of financial statements in conformity with United States generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported period. Actual results could differ from those estimates. Certain prior year amounts have been conformed to the current year's presentation, including the presentation of long-term insurance receivables on the consolidated balance sheets of Edison International and Southern California Edison, previously presented as other long-term assets. Cash, Cash Equivalents and Restricted Cash Cash equivalents include investments in money market funds. Generally, the carrying value of cash equivalents equals the fair value, as these investments have original maturities of three months or less. The cash equivalents were as follows: Edison International SCE December 31, (in millions) 2020 2019 2020 2019 Money market funds $ 62 $ 31 $ 38 $ — Cash is temporarily invested until required for check clearing. Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows: Edison International SCE December 31, (in millions) 2020 2019 2020 2019 Book balances reclassified to accounts payable $ 69 $ 75 $ 69 $ 74 The following table sets forth the cash, cash equivalents and restricted cash included in the consolidated statements of cash flows: (in millions) December 31, 2020 December 31, 2019 Edison International: Cash and cash equivalents $ 87 $ 68 Short-term restricted cash 1 2 2 Total cash, cash equivalents, and restricted cash $ 89 $ 70 SCE: Cash and cash equivalents $ 55 $ 24 Short-term restricted cash 1 1 — Total cash, cash equivalents, and restricted cash $ 56 $ 24 1 Reflected in "Other current assets" on Edison International's and SCE's consolidated balance sheets. Allowance for Uncollectible Accounts The allowance for uncollectible accounts is recorded based on SCE's estimate of expected credit losses and adjusted over the life of the receivables as needed. Since the customer base of SCE is concentrated in Southern California and exposes SCE to a homogeneous set of economic conditions, the allowance is measured on a collective basis on the historical amounts written-off, assessment of customer collectibility and current economic trends, including unemployment rates and any likelihood of recession for the region. At December 31, 2020, this included the estimated impacts of the COVID-19 pandemic. The following table sets forth the changes in allowance for uncollectible accounts for SCE: Year ended December 31, 2020 (in millions) Customers All others Beginning balance $ 35 $ 14 Plus: current period provision for uncollectible accounts Included in operation and maintenance expenses 36 9 Deferred to regulatory assets 120 — Less: write-offs, net of recoveries 16 10 Ending balance $ 175 $ 13 Inventory SCE's inventory is primarily composed of materials, supplies and spare parts, and generally stated at weighted average cost. Emission Allowances and Energy Credits SCE is allocated greenhouse gas ("GHG") allowances annually which it is then required to sell into quarterly auctions. GHG proceeds from the auctions are recorded as a regulatory liability to be refunded to customers. SCE purchases GHG allowances in quarterly auctions or from counterparties to satisfy its GHG emission compliance obligations and recovers such costs of GHG allowances from customers. GHG allowances held for use are classified as "Other current assets" on the consolidated balance sheets and are stated, similar to an inventory method, at the lower of weighted average cost or market. SCE had GHG allowances held for use of $78 million and $50 million at December 31, 2020 and 2019, respectively. GHG emission obligations were $64 million and $50 million at December 31, 2020 and 2019, respectively, and are classified as "Other current liabilities" on the consolidated balance sheets. SCE is allocated low carbon fuel standard ("LCFS") credits which it sells to market participants. Proceeds from the sales, net of program costs, are recorded in a balancing account to be refunded to eligible customers. SCE's net proceeds from the sale of these LCFS credits were $176 million and $184 million and are classified as "Regulatory liabilities" on the consolidated balance sheets at December 31, 2020 and 2019, respectively. Property, Plant and Equipment SCE plant additions, including eligible replacements and betterments, are capitalized. Direct material and labor and indirect costs such as construction overhead, administrative and general costs, pension and benefits, and property taxes are capitalized as part of plant additions. The CPUC authorizes a capitalization rate for each of the indirect costs which are allocated to each project based on either labor or total costs. Estimated useful lives authorized by the CPUC in the 2018 General Rate Case ("GRC") and weighted average useful lives of SCE's property, plant and equipment, are as follows: Estimated Useful Lives Weighted Average Useful Lives Generation plant 10 years to 55 years 36 years Distribution plant 20 years to 65 years 48 years Transmission plant 45 years to 65 years 54 years General plant and other 5 years to 60 years 25 years Depreciation of utility property, plant and equipment is computed on a straight-line, remaining-life basis. SCE's depreciation expense was $1.8 billion, $1.7 billion and $1.7 billion for 2020, 2019 and 2018, respectively. Depreciation expense stated as a percent of average original cost of depreciable utility plant was, on a composite basis, 3.6%, 3.6% and 3.7% for 2020, 2019 and 2018, respectively. The original costs of retired property are charged to accumulated depreciation. See Note 2 for further information. Nuclear fuel for the Palo Verde Nuclear Generating Station ("Palo Verde") is recorded as utility plant (nuclear fuel in the fabrication and installation phase is recorded as construction in progress) in accordance with CPUC ratemaking procedures. Palo Verde nuclear fuel is amortized using the units of production method. Allowance for funds used during construction ("AFUDC") represents the estimated cost of debt and equity funds that finance utility-plant construction and is capitalized during certain plant construction. AFUDC is recovered in rates through depreciation expense over the useful life of the related asset. AFUDC equity represents a method to compensate SCE for the estimated cost of equity used to finance utility plant additions and is recorded as part of construction in progress. AFUDC equity was $121 million, $101 million and $104 million in 2020, 2019 and 2018, respectively, and is reflected in "Other income." AFUDC debt was $53 million, $63 million and $44 million in 2020, 2019 and 2018, respectively and is reflected as a reduction of "Interest expense." Major Maintenance Major maintenance costs for SCE's power plant facilities and equipment are expensed as incurred. Impairment of Long-Lived Assets Impairments of long-lived assets are evaluated based on a review of estimated future cash flows expected to be generated whenever events or changes in circumstances indicate that the carrying amount of such investments or assets may not be recoverable. If the carrying amount of a long-lived asset exceeds expected future cash flows, undiscounted and without interest charges, an impairment loss is recognized in the amount of the excess of fair value over the carrying amount. Fair value is determined via market, cost and income-based valuation techniques, as appropriate. Accounting principles for rate-regulated enterprises also require recognition of an impairment loss if it becomes probable that the regulated utility will abandon a plant investment, or if it becomes probable that the cost of a recently completed plant will be disallowed, either directly or indirectly, for ratemaking purposes and a reasonable estimate of the amount of the disallowance can be made. Initial and annual contributions to the wildfire insurance fund established pursuant to California Assembly Bill 1054 (the "Wildfire Insurance Fund" and "AB 1054") Edison International and SCE accounted for the contributions to the Wildfire Insurance Fund similarly to prepaid insurance. No period of coverage was provided in AB 1054, therefore expense is being allocated to periods ratably based on an estimated period of coverage. Edison International and SCE have a $2.4 billion and $2.8 billion long-term asset at December 31, 2020 and December 31, 2019, respectively, and a $323 million current asset reflected as "Wildfire Insurance Fund contributions" in the consolidated balance sheets for the initial $2.4 billion contribution made during the third quarter of 2019 and the present value of annual contributions SCE committed to make to the Wildfire Insurance Fund, reduced by amortization at both December 31, 2020 and December 31, 2019. A long-term liability of $703 million and $785 million have been reflected in "Other deferred credits and other long-term liabilities" for the present value of unpaid contribution amounts, at December 31, 2020 and December 31, 2019, respectively. Contributions were discounted to the present value at the date SCE committed to participate in the Wildfire Insurance Fund using US treasury interest rates. During 2020 a period of 10 years was used to amortize the asset. All expenses related to the contributions are being reflected in "Operation and maintenance" in the consolidated statements of income. Changes in the estimated period of coverage provided by the Wildfire Insurance Fund could lead to material changes in future expense recognition. In estimating the period of coverage Edison International and SCE used Monte Carlo simulations based on five years (2014 – 2018) of historical data from wildfires caused by electrical utility equipment to estimate expected losses. The details of the operation of the Wildfire Insurance Fund and estimates related to claims by SCE, Pacific Gas & Electric Company ("PG&E") and San Diego Gas & Electric ("SDG&E") against the fund have been applied to the expected loss simulations to estimate the period of coverage of the fund. The most sensitive inputs to the estimated period of coverage are the expected frequency of wildfire events caused by investor-owned utility electrical equipment and the estimated costs associated with those forecasted events. Edison International and SCE evaluate all inputs annually, or upon claims being made from the fund for catastrophic wildfires, and the expected life of the insurance fund will be adjusted as required. Based on information available in the first quarter of 2021 regarding catastrophic wildfires during 2019 and 2020, SCE reassessed its estimate of the life of the Wildfire Insurance Fund. Using 7 years of historical data (2014 – 2020) of wildfires caused by electrical utility equipment to create Monte Carlo simulations of expected loss, resulted in the expected life of the Wildfire Insurance Fund increasing from 10 years to 15 years from the date SCE committed to participate in the Wildfire Insurance Fund. Edison International and SCE will assess the Wildfire Insurance Fund contribution assets for impairment in the event that a participating utility's electrical equipment is found to be the substantial cause of a catastrophic wildfire, based on the ability of SCE to benefit from the coverage provided by the Wildfire Insurance Fund in an amount equal to the recorded assets. Goodwill Edison International assesses goodwill through an annual goodwill impairment test, at the reporting unit level as of October 1 of each year. Edison International updates its goodwill impairment test between annual tests if events occur or circumstances change such that it is more likely than not that the fair value of a reporting unit is below its carrying value. In June 2020, the goodwill associated with Edison Energy was fully impaired primarily from the economic impact of COVID-19. During the second quarter of 2020 and in the fourth quarter of 2019 and 2018, Edison International recorded an impairment of its Edison Energy reporting unit goodwill totaling $34 million ($25 million after-tax), $25 million ($18 million after-tax), $19 million ($13 million after-tax), respectively. At December 31, 2020 and December 31, 2019, Edison International had no remaining goodwill and $34 million of goodwill, respectively, all of which is related to its Edison Energy reporting unit. Nuclear Decommissioning and Asset Retirement Obligations The fair value of a liability for an asset retirement obligation ("ARO") is recorded in the period in which it is incurred, including a liability for the fair value of a conditional ARO, if the fair value can be reasonably estimated even though uncertainty exists about the timing and/or method of settlement. When an ARO liability is initially recorded, SCE capitalizes the cost by increasing the carrying amount of the related long-lived asset. For each subsequent period, the liability is increased for accretion expense and the capitalized cost is depreciated over the useful life of the related asset. SCE has not recorded an ARO for assets that are expected to operate indefinitely or where SCE cannot estimate a settlement date (or range of potential settlement dates). As such, ARO liabilities are not recorded for certain retirement activities, including certain hydroelectric facilities. The following table summarizes the changes in SCE's ARO liability: December 31, (in millions) 2020 2019 Beginning balance $ 3,029 $ 3,031 Accretion 1 160 166 Revisions (36) 4 Liabilities settled (223) (172) Ending balance $ 2,930 $ 3,029 1 An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting. AROs related to decommissioning of SCE's nuclear power facilities are based on site-specific studies conducted as part of each Nuclear Decommissioning Cost Triennial Proceeding ("NDCTP") conducted before the CPUC. Revisions of an ARO are established for updated site-specific decommissioning cost estimates. The ARO for decommissioning SCE's San Onofre Nuclear Generating Station ("San Onofre") and Palo Verde nuclear power facilities is $2.6 billion as of December 31, 2020. The liability to decommission SCE's nuclear power facilities is based on a 2017 decommissioning study that was filed as part of the 2018 NDCTP for San Onofre Units 1, 2 and 3, and a 2019 decommissioning study for Palo Verde. SCE revised the ARO for Palo Verde in 2020 and for San Onofre Units 1, 2 and 3 in 2018 to reflect updated decommissioning cost estimates. SCE records an ARO regulatory liability as a result of timing differences between the recognition of costs and the recovery of costs through the ratemaking process. For further information, see Note 11. Decommissioning of San Onofre Unit 1 began in 1999 and the transfer of spent nuclear fuel from Unit 1 to dry cask storage in the Independent Spent Fuel Storage Installation ("ISFSI") was completed in 2005. Major decommissioning work for Unit 1 has been completed except for certain underground work. Decommissioning of San Onofre Units 2 and 3 began in June 2013 and the spent nuclear fuel transfer from San Onofre Units 2 and 3 to dry cask storage in the ISFSI was completed in August 2020. In October 2019, the California Coastal Commission approved SCE's application for the Coastal Development Permit, the principal discretionary permit required to start major decommissioning activities at San Onofre. In August 2020, SCE commenced major decommissioning activities at San Onofre in accordance with the terms of the permit. Decommissioning costs, which are recovered through customer rates over the term of each nuclear facility's operating license, are recorded as a component of depreciation expense, with a corresponding credit to the ARO regulatory liability. Due to regulatory recovery of SCE's nuclear decommissioning expense, prudently incurred costs for nuclear decommissioning activities do not affect SCE's earnings. Amortization of the ARO asset (included within the unamortized nuclear investment) and accretion of the ARO liability are deferred as decreases to the ARO regulatory liability account, resulting in no impact on earnings. SCE has collected in rates amounts for the future decommissioning of its nuclear assets and has placed those amounts in independent trusts. Amounts collected in rates in excess of the ARO liability are classified as regulatory liabilities. Changes in the estimated costs, timing of decommissioning or the assumptions underlying these estimates could cause material revisions to the estimated total cost to decommission. SCE currently estimates that it will spend approximately $6.6 billion through 2079 to decommission its nuclear facilities. This estimate is based on SCE's decommissioning cost methodology used for ratemaking purposes, escalated at rates ranging from 0.6% to 7.5% (depending on the cost element) annually. These costs are expected to be funded from independent decommissioning trusts. SCE estimates annual after-tax earnings on the decommissioning funds of 1.3% to 4.1% dependent on asset class. If the assumed return on trust assets is not earned or costs escalate at higher rates, SCE expects that additional funds needed for decommissioning will be recoverable through future rates, subject to a reasonableness review. See Note 10 for further information. Due to regulatory recovery of SCE's nuclear decommissioning expense, prudently incurred costs for nuclear decommissioning activities do not affect SCE's earnings. SCE's nuclear decommissioning costs are subject to CPUC review through the triennial regulatory proceeding. SCE's nuclear decommissioning trust investments primarily consist of fixed income investments that are classified as available-for-sale and equity investments. Due to regulatory mechanisms, investment earnings and realized gains and losses have no impact on earnings. Unrealized gains and losses on decommissioning trust funds, including impairment, increase or decrease the trust assets and the related regulatory asset or liability and have no impact on electric utility revenue or decommissioning expense. SCE reviews each fixed income security for impairment on the last day of each month. If the fair value on the last day of the month is less than the amortized cost for that security, SCE impairs the disclosed amortized cost. If the fair value is greater or less than the carrying value for that security at the time of sale, SCE recognizes a related realized gain or loss, respectively. Deferred Financing Costs Debt premium, discount and issuance expenses incurred in connection with obtaining financing are deferred and amortized on a straight-line basis. Under CPUC ratemaking procedures, SCE's debt reacquisition expenses are amortized over the remaining life of the reacquired debt or, if refinanced, the life of the new debt. SCE had unamortized losses on reacquired debt of $133 million and $142 million at December 31, 2020 and 2019, respectively, reflected as long-term "Regulatory assets" in the consolidated balance sheets. In addition, Edison International and SCE had debt issuance costs related to issuances of long-term debt of $131 million and $117 million at December 31, 2020, respectively, and $121 million and $106 million at December 31, 2019, respectively, reflected as a reduction of "Long-term debt" on the consolidated balance sheets. Amortization of deferred financing costs charged to interest expense is as follows: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Amortization of deferred financing costs charged to interest expense $ 32 $ 30 $ 30 $ 27 $ 26 $ 26 Revenue Recognition Revenue is recognized by Edison International and SCE when a performance obligation to transfer control of the promised goods is satisfied or when services are rendered to customers. This typically occurs when electricity is delivered to customers, which includes amounts for services rendered but unbilled at the end of a reporting period. SCE's Revenue from Contracts with Customers Provision of Electricity SCE principally generates revenue through supplying and delivering electricity to its customers. Rates charged to customers are based on tariff rates, approved by the CPUC and FERC. Starting with SCE's 2021 GRC, revenue will be authorized through quadrennial GRC proceedings, which are intended to provide SCE a reasonable opportunity to recover its costs and earn a return on its CPUC-jurisdictional rate base. The CPUC sets an annual revenue requirement for the base year and the remaining three years are set by a methodology established in the GRC proceeding. Revenue was previously authorized by the CPUC in triennial GRC proceedings. As described above, SCE also earns revenue, with no return, to recover costs for power procurement and other activities. Revenue is authorized by the FERC through a formula rate which is intended to provide SCE a reasonable opportunity to recover transmission capital and operating costs that are prudently incurred, including a return on its FERC-jurisdictional rate base. Under the operation of the formula rate, transmission revenue is updated to actual cost of service annually. For SCE's electricity sales for both residential and non-residential customers, SCE satisfies the performance obligation of delivering electricity over time as the customers simultaneously receive and consume the delivered electricity. Energy sales are typically on a month-to-month implied contract for transmission, distribution and generation services. Revenue is recognized over time as the energy is supplied and delivered to customers and the respective revenue is billed and paid on a monthly basis. CPUC and FERC rates decouple authorized revenue from the volume of electricity sales and the price of energy procured so that SCE receives revenue equal to amounts authorized by the relevant regulatory agencies. As a result, the volume of electricity sold to customers and specific customer classes does not have a direct impact on SCE's financial results. See Note 7 for further information on SCE's revenue. Sales and Use Taxes SCE bills certain sales and use taxes levied by state or local governments to its customers. Included in these sales and use taxes are franchise fees, which SCE pays to various municipalities (based on contracts with these municipalities) in order to operate within the limits of the municipality. SCE bills these franchise fees to its customers based on a CPUC-authorized rate. These franchise fees, which are required to be paid regardless of SCE's ability to collect from the customer, are accounted for on a gross basis. SCE's franchise fees billed to customers were $131 million, $122 million and $133 million for the years ended December 31, 2020, 2019 and 2018, respectively. When SCE acts as an agent for sales and use tax, the taxes are accounted for on a net basis. Amounts billed to and collected from customers for these taxes are remitted to the taxing authorities and are not recognized as electric utility revenue. SCE's Alternative Revenue Programs The CPUC and FERC have authorized additional, alternative revenue programs which adjust billings for the effects of broad external factors or compensate SCE for demand-side management initiatives and provide for incentive awards if SCE achieves certain objectives. These alternative revenue programs allow SCE to recover costs that SCE has been authorized to pass on to customers, including costs to purchase electricity and natural gas, and to fund public purpose, demand response, and customer energy efficiency programs. In general, revenue is recognized for these alternative revenue programs at the time the costs are incurred and, for incentive-based programs, at the time the awards are approved by the CPUC. SCE begins recognizing revenues for these programs when a program has been established by an order from either the CPUC or FERC that allows for automatic adjustment of future rates, the amount of revenue for the period is objectively determinable and probable of recovery and the revenue will be collected within 24 months following the end of the annual period. Regulatory Proceedings 2018 General Rate Case In May 2019, the CPUC approved a final decision in SCE's 2018 GRC. The revenue requirements in the 2018 GRC final decision are retroactive to January 1, 2018. SCE recorded the prior period impact of the 2018 GRC final decision in 2019 including: • An increase to earnings of $65 million attributable to 2018 from the application of the decision to revenue, depreciation expense and income tax expense. The reduction of revenue of $289 million reflected the lower authorized revenue related to 2018. • An impairment of utility property, plant and equipment of $170 million ($123 million after-tax) related to disallowed historical capital expenditures, primarily the write-off of specific pole replacements the CPUC determined were performed prematurely. 2021 General Rate Case In the 2021 GRC, SCE has requested a test year revenue requirement of $7.6 billion, an approximately $1.3 billion increase over the 2020 revenue requirement authorized in the 2018 GRC as updated for post test-year ratemaking changes. SCE believes that receiving a proposed decision on track 1 of the 2021 GRC in the first quarter of 2021 in line with the CPUC’s schedule for track 1 is unlikely. The CPUC has approved the establishment of a memorandum account making the authorized revenue requirement changes effective January 1, 2021. SCE cannot predict the revenue requirement the CPUC will ultimately authorize or forecast the timing of a final decision. SCE expects to recognize revenue based on the 2020 authorized revenue requirement until a GRC decision is issued. Power Purchase Agreements SCE enters into power purchase agreements ("PPAs") in the normal course of business. A power purchase agreement may be considered a variable interest in a variable interest entity ("VIE"). If SCE is the primary beneficiary in the VIE, SCE should consolidate the VIE. None of SCE's PPAs resulted in consolidation of a VIE at December 31, 2020 and 2019. See Note 3 for further discussion of PPAs that are considered variable interests. A PPA may also contain a lease for accounting purposes. See "Leases" below and Note 12 and Note 13 for further discussion of SCE's PPAs, including agreements that are classified as operating and finance leases for accounting purposes. A PPA that does not contain a lease may be classified as a derivative which is recorded at fair value on the consolidated balance sheets. These PPAs may be eligible for an election to designate as a normal purchase and sale, which is accounted for on an accrual basis as an executory contract. See Note 6 for further information on derivative instruments. PPAs that do not meet the above classifications are accounted for on an accrual basis. Derivative Instruments SCE records derivative instruments on its consolidated balance sheets as either assets or liabilities measured at fair value unless otherwise exempted from derivative treatment as normal purchases or sales. The normal purchases and sales exception requires, among other things, physical delivery in quantities expected to be used or sold over a reasonable period in the normal course of business. Realized gains and losses from SCE's derivative instruments are expected to be recovered from or refunded to customers through regulatory mechanisms and, therefore, SCE's fair value changes have no impact on purchased power expense or earnings. SCE does not use hedge accounting for derivative transactions due to regulatory accounting treatment. Where SCE's derivative instruments are subject to a master netting agreement and certain criteria are met, SCE presents its derivative assets and liabilities on a net basis on its consolidated balance sheets. In addition, derivative positions are offset against margin and cash collateral deposits. The results of derivative activities are recorded as part of cash flows from operating activities on the consolidated statements of cash flows. See Note 6 for further information on derivative instruments. Leases On January 1, 2019, Edison International and SCE adopted accounting standards updates that require lessees to recognize a lease on the balance sheet as a right-of-use ("ROU") asset and related lease liability and classify the lease as either operating or finance. A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified assets for a period of time in exchange for consideration. An entity controls the use when it has a right to obtain substantially all of the benefits from the use of the identified asset and has the right to direct the use of the asset. SCE determines if an arrangement is a lease at contract inception. SCE includes both the lease and non-lease components as a single component and

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment SCE's property, plant and equipment included in the consolidated balance sheets is composed of the following: December 31, (in millions) 2020 2019 Distribution $ 28,663 $ 26,929 Transmission 15,669 14,720 Generation 3,709 3,664 General plant and other 5,129 4,583 Accumulated depreciation (10,681) (9,958) 42,489 39,938 Construction work in progress 5,033 4,131 Nuclear fuel, at amortized cost 131 129 Total utility property, plant and equipment $ 47,653 $ 44,198 Capitalized Software Costs SCE capitalizes costs incurred during the application development stage of internal use software projects to property, plant and equipment. SCE amortizes capitalized software costs ratably over the expected lives of the software, primarily ranging from 5 to 7 years and commencing upon operational use. Capitalized software costs, included in general plant and other above, were $1.2 billion and $1.0 billion at December 31, 2020 and 2019, respectively, and accumulated amortization was $0.6 billion and $0.4 billion, at December 31, 2020 and 2019, respectively. Amortization expense for capitalized software was $218 million, $190 million and $198 million in 2020, 2019 and 2018, respectively. At December 31, 2020, amortization expense is estimated to be $213 million, $168 million, $136 million, $82 million and $30 million for 2021 through 2025, respectively. Jointly Owned Utility Projects SCE owns undivided interests in transmission and generating assets for which each participant provides its own financing. SCE's proportionate share of these assets is reflected in the consolidated balance sheets and included in the above table. SCE's proportionate share of expenses for each project is reflected in the consolidated statements of income. The following is SCE's investment in each asset as of December 31, 2020: (in millions) Plant in Service Construction Work in Progress Accumulated Nuclear Fuel Net Book Value Ownership Transmission systems: Eldorado $ 324 $ 74 $ 39 $ — $ 359 79 % Pacific Intertie 346 — 74 — 272 50 % Generating station: Palo Verde (nuclear) 2,113 53 1,609 131 688 16 % Total $ 2,783 $ 127 $ 1,722 $ 131 $ 1,319 In addition, SCE has ownership interests in jointly owned power poles with other companies.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities A VIE is defined as a legal entity that meets one of two conditions: (1) the equity owners do not have sufficient equity at risk, or (2) the holders of the equity investment at risk, as a group, lack any of the following three characteristics: decision-making rights, the obligation to absorb losses, or the right to receive the expected residual returns of the entity. The primary beneficiary is identified as the variable interest holder that has both the power to direct the activities of the VIE that most significantly impact the entity's economic performance and the obligation to absorb losses or the right to receive benefits from the entity that could potentially be significant to the VIE. The primary beneficiary is required to consolidate the VIE. Commercial and operating activities are generally the factors that most significantly impact the economic performance of such VIEs. Commercial and operating activities include construction, operation and maintenance, fuel procurement, dispatch and compliance with regulatory and contractual requirements. Variable Interest in VIEs that are not Consolidated Power Purchase Agreements SCE has PPAs that are classified as variable interests in VIEs, including agreements through which SCE provides the natural gas to fuel the plants and fixed price contracts for renewable energy. SCE has concluded that it is not the primary beneficiary of these VIEs since it does not control the commercial and operating activities of these entities. Since payments for capacity are the primary source of income, the most significant economic activity for these VIEs is the operation and maintenance of the power plants. As of the balance sheet date, the carrying amount of assets and liabilities in SCE's consolidated balance sheets that relate to involvement with VIEs result from amounts due under the PPAs. Under these contracts, SCE recovers the costs incurred through demonstration of compliance with its CPUC-approved long-term power procurement plans. SCE has no residual interest in the entities and has not provided or guaranteed any debt or equity support, liquidity arrangements, performance guarantees or other commitments associated with these contracts other than the purchase commitments described in Note 12. As a result, there is no significant potential exposure to loss to SCE from its variable interest in these VIEs. The aggregate contracted capacity dedicated to SCE from these VIE projects was 5,103 megawatts ("MW") and 4,497 MW at December 31, 2020 and 2019, respectively, and the amounts that SCE paid to these projects were $744 million and $833 million for the years ended December 31, 2020 and 2019, respectively. These amounts are recoverable in customer rates, subject to reasonableness review. Unconsolidated Trusts of SCE SCE Trust II, Trust III, Trust IV, Trust V and Trust VI were formed in 2013, 2014, 2015, 2016 and 2017, respectively, for the exclusive purpose of issuing the 5.10%, 5.75%, 5.375%, 5.45% and 5.00% trust preference securities, respectively ("trust securities"). The trusts are VIEs. SCE has concluded that it is not the primary beneficiary of these VIEs as it does not have the obligation to absorb the expected losses or the right to receive the expected residual returns of the trusts. SCE Trust II, Trust III, Trust IV, Trust V and Trust VI issued to the public trust securities in the face amounts of $400 million, $275 million, $325 million, $300 million and $475 million (cumulative, liquidation amounts of $25 per share), respectively, and $10,000 of common stock each to SCE. The trusts invested the proceeds of these trust securities in Series G, Series H, Series J, Series K and Series L Preference Stock issued by SCE in the principal amounts of $400 million, $275 million, $325 million, $300 million and $475 million (cumulative, $2,500 per share liquidation values), respectively, which have substantially the same payment terms as the respective trust securities. The Series G, Series H, Series J, Series K and Series L Preference Stock and the corresponding trust securities do not have a maturity date. Upon any redemption of any shares of the Series G, Series H, Series J, Series K or Series L Preference Stock, a corresponding dollar amount of trust securities will be redeemed by the applicable trust (see Note 14 for further information). The applicable trust will make distributions at the same rate and on the same dates on the applicable series of trust securities if and when the SCE board of directors declares and makes dividend payments on the related Preference Stock. The applicable trust will use any dividends it receives on the related Preference Stock to make its corresponding distributions on the applicable series of trust securities. If SCE does not make a dividend payment to any of these trusts, SCE would be prohibited from paying dividends on its common stock. SCE has fully and unconditionally guaranteed the payment of the trust securities and trust distributions, if and when SCE pays dividends on the related Preference Stock. In September 2020, SCE Trust II redeemed $180 million of its trust securities from the public. The Trust II balance sheets as of December 31, 2020 and December 31, 2019 consisted of investments of $220 million and $400 million in the Series G Preference Stock, respectively, $220 million and $400 million of trust securities, respectively, and $10,000 each of common stock. The Trust III, Trust IV, Trust V and Trust VI balance sheets as of December 31, 2020 and December 31, 2019 consisted of investments of $275 million, $325 million, $300 million, and $475 million in the Series H, Series J, Series K and Series L Preference Stock, respectively, $275 million, $325 million, $300 million, and $475 million of trust securities, respectively, and $10,000 each of common stock. The following table provides a summary of the trusts' income statements: Years ended December 31, (in millions) Trust II Trust III Trust IV Trust V Trust VI 2020 Dividend income $ 20 $ 16 $ 17 $ 16 $ 24 Dividend distributions 20 16 17 16 24 2019 Dividend income $ 20 $ 16 $ 17 $ 16 $ 24 Dividend distributions 20 16 17 16 24 2018 Dividend income $ 20 $ 16 $ 17 $ 16 $ 24 Dividend distributions 20 16 17 16 24

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Recurring Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (referred to as an "exit price"). Fair value of an asset or liability considers assumptions that market participants would use in pricing the asset or liability, including assumptions about nonperformance risk. As of December 31, 2020 and 2019, nonperformance risk was not material for Edison International and SCE. Assets and liabilities are categorized into a three-level fair value hierarchy based on valuation inputs used to determine fair value. Level 1 – The fair value of Edison International's and SCE's Level 1 assets and liabilities is determined using unadjusted quoted prices in active markets that are available at the measurement date for identical assets and liabilities. This level includes exchange-traded equity securities, U.S. treasury securities, mutual funds and money market funds. Level 2 – Edison International's and SCE's Level 2 assets and liabilities include fixed income securities, primarily consisting of U.S. government and agency bonds, municipal bonds and corporate bonds, and over-the-counter derivatives. The fair value of fixed income securities is determined using a market approach by obtaining quoted prices for similar assets and liabilities in active markets and inputs that are observable, either directly or indirectly, for substantially the full term of the instrument. The fair value of SCE's over-the-counter derivative contracts is determined using an income approach. SCE uses standard pricing models to determine the net present value of estimated future cash flows. Inputs to the pricing models include forward published or posted clearing prices from an exchange (Intercontinental Exchange) for similar instruments and discount rates. A primary price source that best represents trade activity for each market is used to develop observable forward market prices in determining the fair value of these positions. Broker quotes, prices from exchanges or comparison to executed trades are used to validate and corroborate the primary price source. These price quotations reflect mid-market prices (average of bid and ask) and are obtained from sources believed to provide the most liquid market for the commodity. Level 3 – The fair value of SCE's Level 3 assets and liabilities is determined using the income approach through various models and techniques that require significant unobservable inputs. This level includes derivative contracts that trade infrequently such as congestion revenue rights ("CRRs"). Edison International Parent and Other does not have any Level 3 assets and liabilities. Assumptions are made in order to value derivative contracts in which observable inputs are not available. In circumstances where fair value cannot be verified with observable market transactions, it is possible that a different valuation model could produce a materially different estimate of fair value. Modeling methodologies, inputs, and techniques are reviewed and assessed as markets continue to develop and more pricing information becomes available and the fair value is adjusted when it is concluded that a change in inputs or techniques would result in a new valuation that better reflects the fair value of those derivative contracts. See Note 6 for a discussion of derivative instruments. SCE The following table sets forth assets and liabilities of SCE that were accounted for at fair value by level within the fair value hierarchy: December 31, 2020 (in millions) Level 1 Level 2 Level 3 Netting and Collateral 1 Total Assets at fair value Derivative contracts $ — $ 6 $ 120 $ (18) $ 108 Other 39 23 — — 62 Nuclear decommissioning trusts: Stocks 2 1,908 — — — 1,908 Fixed Income 3 519 2,113 — — 2,632 Short-term investments, primarily cash equivalents 447 52 — — 499 Subtotal of nuclear decommissioning trusts 4 2,874 2,165 — — 5,039 Total assets 2,913 2,194 120 (18) 5,209 Liabilities at fair value Derivative contracts — 10 12 (22) — Total liabilities — 10 12 (22) — Net assets $ 2,913 $ 2,184 $ 108 $ 4 $ 5,209 December 31, 2019 (in millions) Level 1 Level 2 Level 3 Netting and Collateral 1 Total Assets at fair value Derivative contracts $ — $ 19 $ 83 $ (15) $ 87 Other 4 14 — — 18 Nuclear decommissioning trusts: Stocks 2 1,765 — — — 1,765 Fixed Income 3 738 2,024 — — 2,762 Short-term investments, primarily cash equivalents 98 48 — — 146 Subtotal of nuclear decommissioning trusts 4 2,601 2,072 — — 4,673 Total assets 2,605 2,105 83 (15) 4,778 Liabilities at fair value Derivative contracts — 11 5 (15) 1 Total liabilities — 11 5 (15) 1 Net assets $ 2,605 $ 2,094 $ 78 $ — $ 4,777 1 Represents the netting of assets and liabilities under master netting agreements and cash collateral. 2 Approximately 71% and 72% of SCE's equity investments were located in the United States at December 31, 2020 and 2019, respectively. 3 Includes corporate bonds, which were diversified and included collateralized mortgage obligations and other asset backed securities of $29 million and $46 million at December 31, 2020 and 2019, respectively. 4 Excludes net payables of $206 million and $111 million at December 31, 2020 and 2019, respectively, which consist of interest and dividend receivables as well as receivables and payables related to SCE's pending securities sales and purchases. Edison International Parent and Other Edison International Parent and Other assets measured at fair value and classified as Level 1 consisted of money market funds of $24 million and $31 million at December 31, 2020 and 2019, respectively. Edison International Parent and Other assets measured at fair value and classified as Level 2 consisted of short-term investments of $5 million at December 31, 2020. Edison International Parent and Other had no short-term investments as of December 31, 2019. SCE Fair Value of Level 3 The following table sets forth a summary of changes in SCE's fair value of Level 3 net derivative assets and liabilities: December 31, (in millions) 2020 2019 Fair value of net assets at beginning of period $ 78 $ 141 Purchases 8 6 Sales (5) (5) Settlements (117) (60) Total realized/unrealized gains (losses) 1,2 144 (4) Fair value of net assets at end of period $ 108 $ 78 1 Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities. 2 There were no material transfers into or out of Level 3 during 2020 and 2019. The following table sets forth SCE's valuation techniques and significant unobservable inputs used to determine fair value for significant Level 3 assets and liabilities: Fair Value (in millions) Significant Range (per MWh) Weighted Average (per MWh) Assets Liabilities Valuation Technique Unobservable Input Congestion revenue rights December 31, 2020 $ 120 $ 12 Auction prices CAISO CRR auction clearing prices $(9.67) - $300.47 $2.75 December 31, 2019 83 5 Auction prices CAISO CRR auction clearing prices (3.59) - 25.32 1.97 Level 3 Fair Value Uncertainty For CRRs, increases or decreases in CAISO auction price would result in higher or lower fair value, respectively. Nuclear Decommissioning Trusts SCE's nuclear decommissioning trust investments include equity securities, U.S. treasury securities and other fixed income securities. Equity and treasury securities are classified as Level 1 as fair value is determined by observable market prices in active or highly liquid and transparent markets. The remaining fixed income securities are classified as Level 2. The fair value of these financial instruments is based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes, issuer spreads, bids, offers and relevant credit information. There are no securities classified as Level 3 in the nuclear decommissioning trusts. SCE's investment policies and CPUC requirements place limitations on the types and investment grade ratings of the securities that may be held by the nuclear decommissioning trust funds. These policies restrict the trust funds from holding alternative investments and limit the trust funds' exposures to investments in highly illiquid markets. With respect to equity and fixed income securities, the trustee obtains prices from third-party pricing services which SCE is able to independently corroborate as described below. The trustee monitors prices supplied by pricing services, including reviewing prices against defined parameters' tolerances and performs research and resolves variances beyond the set parameters. SCE corroborates the fair values of securities by comparison to other market-based price sources obtained by SCE's investment managers. Differences outside established thresholds are followed-up with the trustee and resolved. For each reporting period, SCE reviews the trustee determined fair value hierarchy and overrides the trustee level classification when appropriate. Nonrecurring Fair Value Measurements Edison International assesses goodwill at the reporting unit level. The fair value of the Edison Energy reporting unit is classified as Level 3 and is estimated using the income approach. During the second quarter of 2020 and fourth quarter of 2019, Edison International evaluated the recoverability of goodwill and recorded impairment charges of Edison Energy's goodwill totaling $34 million ($25 million after-tax) and $25 million ($18 million after-tax), respectively. See Note 1 for further details. Fair Value of Debt Recorded at Carrying Value The carrying value and fair value of Edison International's and SCE's long-term debt (including current portion of long-term debt) are as follows: December 31, 2020 December 31, 2019 (in millions) Carrying Value 1 Fair Value 2 Carrying Value 1 Fair Value 2 Edison International $ 20,337 $ 23,824 $ 18,343 $ 20,137 SCE 17,204 20,365 15,211 16,892 1 Carrying value is net of debt issuance costs. 2 The fair value of Edison International's and SCE's long-term debt is classified as Level 2.

Debt and Credit Agreements

Debt and Credit Agreements	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements Long-Term Debt The following table summarizes long-term debt (rates and terms are as of December 31, 2020) of Edison International and SCE: December 31, (in millions) 2020 2019 Edison International Parent and Other: Debentures and notes: 2022 – 2028 (2.40% to 5.75%) $ 3,150 $ 3,150 Current portion of long-term debt — (400) Unamortized debt discount/premium and issuance costs, net (17) (18) Total Edison International Parent and Other 3,133 2,732 SCE: First and refunding mortgage bonds: 2022 – 2050 (1.20% to 6.05%) 16,843 14,272 Pollution-control bonds: 2023 (2.63%) 135 752 Debentures and notes: 2029 – 2053 (5.06% to 6.65%) 306 306 Other long-term debt 1 : 324 — Current portion of long-term debt (1,029) (79) Unamortized debt discount/premium and issuance costs, net (80) (119) Total SCE 16,499 15,132 Total Edison International $ 19,632 $ 17,864 1 Subsequent to December 31, 2020, SCE issued first and refunding mortgage bonds which were used to partially pay down its commercial paper balance, see "Debt Financing Subsequent to December 31, 2020" for more information. Accordingly, SCE included the pay down amount of $324 million in other long-term debt. Edison International and SCE long-term debt maturities over the next five years are as follows: (in millions) Edison International SCE 2021 $ 1,029 $ 1,029 2022 1,064 364 2023 1,435 1,035 2024 500 — 2025 1,300 900 Liens and Security Interests Almost all of SCE's properties are subject to a trust indenture lien. SCE has pledged first and refunding mortgage bonds as collateral for borrowed funds obtained from pollution-control bonds issued by government agencies. SCE has a debt covenant that requires a debt to total capitalization ratio to be less than or equal to 0.65 to 1. At December 31, 2020, SCE's debt to total capitalization ratio was 0.51 to 1 and was in compliance with all other financial covenants that affect access to capital. Edison International Parent's credit facility requires a consolidated debt to total capitalization ratio as defined in the applicable agreements of less than or equal to 0.70 to 1. At December 31, 2020, Edison International consolidated debt to total capitalization ratio was 0.59 to 1. Credit Agreements and Short-Term Debt The following table summarizes the status of the credit facilities at December 31, 2020: (in millions, except for rates) Execution date Termination date LIBOR plus (bps) Use of proceeds Commitment Outstanding borrowings Outstanding letters of credit Amount available Edison International Parent June 2019 May 2024 128 Support commercial paper borrowings and general corporate purposes 1, 4 $ 1,500 $ 130 $ — $ 1370 Total Edison International Parent: $ 1,500 $ 130 $ — $ 1,370 SCE March 2020 March 2021 65 Finance a portion of the AB 1054 Capital Expenditures 2 $ 800 $ 495 $ — $ 305 May 2020 May 2021 150 Undercollections related to COVID-19 and general corporate purposes 1,500 — — 1,500 June 2019 May 2024 108 Support commercial paper borrowings and general corporate purposes 3, 4 3,000 725 159 2,116 Total SCE: $ 5,300 $ 1,220 $ 159 $ 3,921 Total Edison International: $ 6,800 $ 1,350 $ 159 $ 5,291 1 At December 31, 2020 Edison International Parent had $130 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.42%. At December 31, 2019 Edison International Parent did not have any outstanding commercial paper. 2 This credit facility may be extended for two 364-day periods, at the lenders' discretion. The aggregate maximum principal amount may be increased up to $1.1 billion provided that additional lender commitments are obtained. 3 At December 31, 2020 and December 31, 2019, SCE had $725 million and $550 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.43% and 2.24%, respectively. As of December 31, 2020, $324 million outstanding commercial paper was classified as long-term debt due to subsequent refinancing. See "Debt Financing Subsequent to December 31, 2020" for more information. 4 The aggregate maximum principal amount under the SCE and Edison International Parent revolving credit facilities may be increased up to $4.0 billion and $2.0 billion, respectively, provided that additional lender commitments are obtained. Term loan and other short-term debt The following table summarizes the status of SCE's term loan and other short-term debt as of December 31, 2020: (in millions, except for rates) Issuance Date Maturity LIBOR plus (bps) Use of Proceeds Issuance Amount Term loan March 2020 March 2021 60 Fund a portion of the AB 1054 Excluded Capital Expenditures $ 475 Floating rate first and refunding mortgage bonds December 2020 December 2021 27 Partial repayment of AB 1054 credit facility and commercial paper borrowings and for general corporate purposes 900 In March 2020, Edison International Parent borrowed $800 million under a term loan agreement due in March 2021 with a variable interest rate based on LIBOR plus 1.125%. The proceeds were used for general corporate purposes. In May 2020, Edison International repaid the outstanding balance of the term loan using the proceeds from issuance of common stock in a registered direct offering. Refer to Note 14 for details of the common stock issuance. Debt Financing Subsequent to December 31, 2020 In January 2021, SCE issued $750 million of 2.95% first and refunding mortgage bonds due in 2051 and $150 million of 2.25% first and refunding mortgage bonds due in 2030. The proceeds were primarily used to repay SCE's commercial paper borrowings and for general corporate purposes.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Derivative financial instruments are used to manage exposure to commodity price risk. These risks are managed in part by entering into forward commodity transactions, including options, swaps and futures. To mitigate credit risk from counterparties in the event of nonperformance, master netting agreements are used whenever possible and counterparties may be required to pledge collateral depending on the creditworthiness of each counterparty and the risk associated with the transaction. Commodity Price Risk Commodity price risk represents the potential impact that can be caused by a change in the market value of a particular commodity. SCE's electricity price exposure arises from energy purchased from and sold to wholesale markets as a result of differences between SCE's load requirements and the amount of energy delivered from its generating facilities and PPAs. SCE's natural gas price exposure arises from natural gas purchased for the Mountainview power plant and peaker plants, qualifying facilities contracts where pricing is based on a monthly natural gas index and PPAs in which SCE has agreed to provide the natural gas needed for generation, referred to as tolling arrangements. Credit and Default Risk Credit and default risk represent the potential impact that can be caused if a counterparty were to default on its contractual obligations and SCE would be exposed to spot markets for buying replacement power or selling excess power. In addition, SCE would be exposed to the risk of non-payment of accounts receivable, primarily related to the sales of excess power and realized gains on derivative instruments. Certain power and gas contracts contain master netting agreements or similar agreements, which generally allow counterparties subject to the agreement to offset amounts when certain criteria are met, such as in the event of default. The objective of netting is to reduce credit exposure. Additionally, to reduce SCE's risk exposures counterparties may be required to pledge collateral depending on the creditworthiness of each counterparty and the risk associated with the transaction. Certain power and gas contracts contain a provision that requires SCE to maintain an investment grade rating from each of the major credit rating agencies, referred to as a credit-risk-related contingent feature. If SCE's credit rating were to fall below investment grade, SCE may be required to post additional collateral to cover derivative liabilities and the related outstanding payables. The net fair value of all derivative liabilities with these credit-risk-related contingent features was less than $1 million and $1 million as of December 31, 2020 and 2019, respectively, for which SCE has posted no collateral to its counterparties at the respective dates for its derivative liabilities and related outstanding payables for both periods. If the credit-risk-related contingent features underlying these agreements were triggered on December 31, 2020, SCE would be required to post $3 million of additional collateral, all of which is related to outstanding payables. Fair Value of Derivative Instruments SCE presents its derivative assets and liabilities on a net basis on its consolidated balance sheets when subject to master netting agreements or similar agreements. Derivative positions are also offset against margin and cash collateral deposits. In addition, SCE has provided collateral in the form of letters of credit. Collateral requirements can vary depending upon the level of unsecured credit extended by counterparties, changes in market prices relative to contractual commitments and other factors. See Note 4 for a discussion of fair value of derivative instruments. The following table summarizes the gross and net fair values of SCE's commodity derivative instruments: December 31, 2020 Derivative Assets Derivative Liabilities Net Asset (in millions) Short-Term 1 Long-Term 2 Subtotal Short-Term 3 Long-Term Subtotal Commodity derivative contracts Gross amounts recognized $ 103 $ 23 $ 126 $ 16 $ 6 $ 22 $ 104 Gross amounts offset in the consolidated balance sheets (12) (6) (18) (12) (6) (18) — Cash collateral posted 4 — — — (4) — (4) 4 Net amounts presented in the consolidated balance sheets $ 91 $ 17 $ 108 $ — $ — $ — $ 108 December 31, 2019 Derivative Assets Derivative Liabilities Net Asset (in millions) Short-Term 1 Long-Term 2 Subtotal Short-Term 3 Long-Term Subtotal Commodity derivative contracts Gross amounts recognized $ 94 $ 8 $ 102 $ 14 $ 2 $ 16 $ 86 Gross amounts offset in the consolidated balance sheets (13) (2) (15) (13) (2) (15) — Cash collateral posted 4 — — — — — — — Net amounts presented in the consolidated balance sheets $ 81 $ 6 $ 87 $ 1 $ — $ 1 $ 86 1 Included in "Other current assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 3 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 4 At December 31, 2020, SCE posted $17 million of cash, of which $4 million was offset against derivative liabilities and $13 million was reflected in "Other current assets" on the consolidated balance sheets. At December 31, 2019, SCE posted $24 million of cash, all of which was not offset against net derivative liabilities and was reflected in "Other current assets" on the consolidated balance sheets. Financial Statement Impact of Derivative Instruments SCE recognizes realized gains and losses on derivative instruments as purchased power expense and expects that such gains or losses will be part of the purchased power costs recovered from customers. As a result, realized gains and losses do not affect earnings, but may temporarily affect cash flows. Due to expected future recovery from customers, unrealized gains and losses are recorded as regulatory assets and liabilities and therefore also do not affect earnings. The remaining effects of derivative activities and related regulatory offsets are reported in cash flows from operating activities in the consolidated statements of cash flows. The following table summarizes the components of SCE's economic hedging activity: Years ended December 31, (in millions) 2020 2019 2018 Realized gains (losses) $ 87 $ (7) $ 26 Unrealized gains (losses) 17 (74) 82 Notional Volumes of Derivative Instruments The following table summarizes the notional volumes of derivatives used for SCE economic hedging activities: Economic Hedges Unit of December 31, Commodity Measure 2020 2019 Electricity options, swaps and forwards GWh 1,581 3,155 Natural gas options, swaps and forwards Bcf 34 43 Congestion revenue rights GWh 41,151 48,170

Revenue

Revenue	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue	Revenue • Earning activities – representing revenue authorized by the CPUC and FERC, which is intended to provide SCE a reasonable opportunity to recover its costs and earn a return on its net investment in generation, transmission and distribution assets. The annual revenue requirements are comprised of authorized operation and maintenance costs, depreciation, taxes and a return consistent with the capital structure. Also, included in earnings activities are revenues or penalties related to incentive mechanisms, other operating revenue and regulatory charges or disallowances. • Cost-recovery activities – representing CPUC- and FERC- authorized balancing accounts, which allow for recovery of specific project or program costs, subject to reasonableness review or compliance with upfront standards. Cost-recovery activities include rates which provide recovery, subject to reasonableness review of, among other things, fuel costs, purchased power costs, public purpose related-program costs (including energy efficiency and demand-side management programs) and certain operation and maintenance expenses. SCE earns no return on these activities. The following table is a summary of SCE's revenue: Years ended December 31, 2020 2019 2018 (in millions) Earning Activities Cost- Recovery Activities Total Consolidated Earning Activities Cost- Recovery Activities Total Consolidated Earning Activities Cost-Recovery Activities Total Consolidated Revenues from contracts with customers 1,2 $ 6,920 $ 5,539 $ 12,459 $ 6,512 $ 4,655 $ 11,167 $ 6,519 $ 5,611 $ 12,130 Alternative revenue programs and other operating revenue 3 548 539 1,087 166 973 1,139 41 440 481 Total operating revenue $ 7,468 $ 6,078 $ 13,546 $ 6,678 $ 5,628 $ 12,306 $ 6,560 $ 6,051 $ 12,611 1 In the absence of a 2018 GRC decision, SCE recognized CPUC revenue in 2018 and first quarter of 2019 based on the 2017 authorized revenue requirements adjusted mainly for the July 2017 cost of capital decision and Tax Reform. SCE recorded the impact of the 2018 GRC final decision in the second quarter of 2019, including a $289 million reduction in revenue related to 2018. These revenue adjustments are included in "Revenues from contracts with customers." See "Note 1. Summary of Significant Accounting Policies—Revenue Recognition—Regulatory Proceedings—2018 General Rate Case" for further information. 2 At December 31, 2020 and 2019, SCE's receivables related to contracts from customers were $1.5 billion and $1.1 billion, which included accrued unbilled revenue of $521 million and $488 million, respectively. 3 Includes differences between amounts billed and authorized levels for both the CPUC and FERC.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Current and Deferred Taxes The components of income tax (benefit) expense by location of taxing jurisdiction are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Current: Federal $ 13 $ — $ (57) $ 12 $ — $ (51) State (22) 6 (155) (26) 14 (93) (9) 6 (212) (14) 14 (144) Deferred: Federal (230) (243) (386) (207) (206) (354) State (66) (41) (141) (56) (37) (198) (296) (284) (527) (263) (243) (552) Total continuing operations (305) (278) (739) (277) (229) (696) Discontinued operations 1 — — (34) — — — Total $ (305) $ (278) $ (773) $ (277) $ (229) $ (696) 1 In the fourth quarter of 2018, Edison International and SCE recognized tax benefits related to a settlement with the California Franchise Tax Board for tax years 1994 – 2006. See further discussion in Tax Disputes below. The components of net accumulated deferred income tax liability are: Edison International SCE December 31, (in millions) 2020 2019 2020 2019 Deferred tax assets: Property $ 590 $ 478 $ 540 $ 435 Wildfire-related 1 1,134 847 1,134 847 Nuclear decommissioning trust assets in excess of nuclear ARO liability 515 449 515 449 Loss and credit carryforwards 2 1,991 1,515 683 253 Regulatory asset 841 739 841 739 Pension and postretirement benefits other than pensions, net 163 170 35 40 Other 513 408 527 416 Sub-total 5,747 4,606 4,275 3,179 Less: valuation allowance 3 35 35 — — Total 5,712 4,571 4,275 3,179 Deferred tax liabilities: Property 8,879 8,244 8,871 8,234 Regulatory liability 1,111 570 1,111 570 Nuclear decommissioning trust assets 515 449 515 449 Other 514 320 499 310 Total 11,019 9,583 10,996 9,563 Accumulated deferred income tax liability, net 4 $ 5,307 $ 5,012 $ 6,721 $ 6,384 1 Relates to accrued estimated losses for wildfire-related claims, net of expected recoveries from insurance and FERC customers, and contributions to the Wildfire Insurance Fund. For further information, see Note 12 and Note 1. 2 As of December 31, 2020, deferred tax assets for net operating loss and tax credit carryforwards are reduced by unrecognized tax benefits of $270 million and $190 million for Edison International and SCE, respectively. 3 As of December 31, 2020, Edison International has recorded a valuation allowance of $31 million for non-California state net operating loss carryforwards, and $4 million for California capital losses generated from sale of SoCore Energy in 2018, which are estimated to expire before being utilized. 4 Included in "Deferred income taxes and credits" on the consolidated balance sheets. Net Operating Loss and Tax Credit Carryforwards The amounts of net operating loss and tax credit carryforwards (after-tax) are as follows: Edison International SCE December 31, 2020 (in millions) Loss Carryforwards Credit Carryforwards Loss Carryforwards Credit Carryforwards Expire in 2021 $ 4 $ — $ 4 $ — Expire between 2022 to 2025 31 — 26 — Expire between 2029 to 2042 1,192 515 380 50 No expiration date 1 509 10 413 — Total $ 1,736 $ 525 $ 823 $ 50 1 Under Tax Reform, federal net operating losses generated after December 31, 2017 can carryforward indefinitely. Edison International consolidates for federal income tax purposes, but not for financial accounting purposes, a group of wind projects referred to as Capistrano Wind. The amount of net operating loss and tax credit carryforwards recognized as part of deferred income taxes includes $218 million and $212 million related to Capistrano Wind for 2020 and 2019, respectively. Under a tax allocation agreement, Edison International has recorded a corresponding liability as part of other long-term liabilities related to its obligation to make payments to Capistrano Wind of these tax benefits when realized. Effective Tax Rate The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Income (loss) from continuing operations before income taxes $ 566 $ 1,127 $ (1,089) $ 665 $ 1,301 $ (885) Provision for income tax at federal statutory rate of 21% 119 237 (229) 140 273 (186) Increase in income tax from: Items presented with related state income tax, net: State tax, net of federal benefit (61) (22) (168) (52) (13) (155) Property-related (320) (303) (275) (320) (303) (275) Change related to uncertain tax positions 1 (15) — (66) (19) — (71) Deferred tax re-measurement 2 — (88) — — (88) — 2018 GRC Final Decision — (80) — — (80) — Corporate-owned life insurance cash surrender value (8) (8) (8) (8) (8) (8) Other (20) (14) 7 (18) (10) (1) Total income tax benefit from continuing operations $ (305) $ (278) $ (739) $ (277) $ (229) $ (696) Effective tax rate (53.9) % (24.7) % (67.9) % (41.7) % (17.6) % (78.6) % 1 In 2020, Edison International and SCE recognized tax expense and benefit, respectively, primarily due to the re-measurement of uncertain tax positions related to the 2010 – 2012 California state tax filings currently under audit. In 2018, Edison International and SCE recognized tax benefits related to a settlement with the California Franchise Tax Board for tax years 1994 – 2006. See further discussion in Tax Disputes below. 2 Relates to changes in the allocation of deferred tax re-measurement between customers and shareholders as a result of a CPUC resolution issued in February 2019. The resolution determined that customers are only entitled to excess deferred taxes which were included when setting rates, while other deferred tax re-measurement belongs to the shareholders. The CPUC requires flow-through ratemaking treatment for the current tax benefit arising from certain property-related and other temporary differences which reverse over time. Flow-through items reduce current authorized revenue requirements in SCE's rate cases and result in a regulatory asset for recovery of deferred income taxes in future periods. The difference between the authorized amounts as determined in SCE's rate cases, adjusted for balancing and memorandum account activities, and the recorded flow-through items also result in increases or decreases in regulatory assets with a corresponding impact on the effective tax rate to the extent that recorded deferred amounts are expected to be recovered in future rates. For further information, see Note 11. Accounting for Uncertainty in Income Taxes Authoritative guidance related to accounting for uncertainty in income taxes requires an enterprise to recognize, in its financial statements, the best estimate of the impact of a tax position by determining if the weight of available evidence indicates it is more likely than not, based solely on the technical merits, that the position will be sustained upon examination. The guidance requires the disclosure of all unrecognized tax benefits, which includes both the reserves recorded for tax positions on filed tax returns and the unrecognized portion of affirmative claims. Unrecognized Tax Benefits The following table provides a reconciliation of unrecognized tax benefits for continuing and discontinued operations: Edison International SCE December 31, (in millions) 2020 2019 2018 2020 2019 2018 Balance at January 1, $ 370 $ 338 $ 432 $ 282 $ 249 $ 331 Tax positions taken during the current year: Increases 55 46 41 56 47 42 Tax positions taken during a prior year: Increases 1 274 6 — 4 6 — Decreases 2 (20) (20) (108) (22) (20) (121) Settlements with taxing authorities 3 — — (27) — — (3) Balance at December 31, $ 679 $ 370 $ 338 $ 320 $ 282 $ 249 1 Edison International recorded favorable tax positions in 2020 in connection with the Edison Mission Energy ("EME") bankruptcy that required a revaluation of the reserve for uncertain tax positions. 2 Decrease in 2018 was related to re-measurement as a result of a settlement with the California Franchise Tax Board for tax years 1994 – 2006. 3 In 2018, Edison International reached a settlement with the California Franchise Tax Board for tax years 1994 – 2006. As of December 31, 2020, if recognized, $446 million of unrecognized tax benefits would impact Edison International's effective tax rate and $87 million of the unrecognized tax benefits would impact SCE's effective tax rate. Tax Disputes Tax years that remain open for examination by the IRS and the California Franchise Tax Board are 2016 – 2019 and 2013 – 2019, respectively. Tax years 2007 – 2012 are currently subject to a settlement proceeding with the California Franchise Tax Board. Edison International does not expect to resolve these tax years within the next 12 months. Any impacts cannot be reasonably estimated until further progress is made. In the fourth quarter of 2018, Edison International recorded the impacts of a settlement reached with the California Franchise Tax Board for tax years 1994 – 2006 that resulted in a $65 million refund of tax and interest. This refund was received in the second quarter of 2019. Accrued Interest and Penalties The total amount of accrued interest and penalties related to income tax liabilities for continuing and discontinued operations are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Accrued interest and penalties $ 52 $ 56 $ 23 $ 29 The net after-tax interest and penalties recognized in income tax expense (benefit) for continuing and discontinued operations are: Edison International SCE December 31, (in millions) 2020 2019 2018 2020 2019 2018 Net after-tax interest and penalties tax expense (benefit) $ 4 $ 4 $ (62) $ 6 $ 3 $ (25)

Compensation and Benefit Plans

Compensation and Benefit Plans	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Compensation and Benefit Plans	Compensation and Benefit Plans Employee Savings Plan The 401(k) defined contribution savings plan is designed to supplement employees' retirement income. The employer contributions were as follows: Edison International SCE (in millions) Years ended December 31, 2020 $ 93 $ 92 2019 82 81 2018 74 74 Pension Plans and Postretirement Benefits Other Than Pensions Pension Plans Noncontributory defined benefit pension plans (some with cash balance features) cover most employees meeting minimum service requirements. Employees hired by the Participating Companies on or after December 31, 2017 will no longer be eligible to participate in the Plan. In lieu of that, an additional non-contributory employer contribution will be deposited into the Edison 401(k) Savings Plan. SCE recognizes pension expense for its nonexecutive plan as calculated by the actuarial method used for ratemaking. The expected contributions (all by the employer) for Edison International and SCE are approximately $55 million and $31 million, respectively, for the year ending December 31, 2021. Annual contributions made by SCE to most of SCE's pension plans are anticipated to be recovered through CPUC-approved regulatory mechanisms. The funded position of Edison International's pension is sensitive to changes in market conditions. Changes in overall interest rate levels significantly affect the company's liabilities, while assets held in the various trusts established to fund Edison International's pension are affected by movements in the equity and bond markets. Due to SCE's regulatory recovery treatment, a regulatory asset has been recorded equal to the unfunded status. See Note 11 for further information. Information on pension plan assets and benefit obligations for continuing and discontinued operations is shown below. Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Change in projected benefit obligation Projected benefit obligation at beginning of year $ 4,139 $ 3,880 $ 3,662 $ 3,431 Service cost 121 114 117 110 Interest cost 124 155 110 138 Actuarial loss 323 240 292 199 Benefits paid (231) (250) (197) (216) Projected benefit obligation at end of year $ 4,476 $ 4,139 $ 3,984 $ 3,662 Change in plan assets Fair value of plan assets at beginning of year $ 3,755 $ 3,321 $ 3,541 $ 3,124 Actual return on plan assets 584 611 551 576 Employer contributions 62 73 45 57 Benefits paid (230) (250) (197) (216) Fair value of plan assets at end of year 4,171 3,755 3,940 3,541 Funded status at end of year $ (305) $ (384) $ (44) $ (121) Amounts recognized in the consolidated balance sheets consist of 1 : Current liabilities (24) (19) (2) (2) Long-term liabilities (281) (365) (42) (119) $ (305) $ (384) $ (44) $ (121) Amounts recognized in accumulated other comprehensive loss consist of: Prior service cost $ (1) $ (1) $ — $ — Net loss 1 96 95 16 17 95 94 16 17 Amounts recognized as a regulatory asset 12 87 12 87 Total not yet recognized as expense $ 107 $ 181 $ 28 $ 104 Accumulated benefit obligation at end of year $ 4,238 $ 3,968 $ 3,776 $ 3,529 Pension plans with an accumulated benefit obligation in excess of plan assets: Projected benefit obligation 4,476 4,139 3,984 3,662 Accumulated benefit obligation 4,238 3,968 3,776 3,529 Fair value of plan assets 4,171 3,755 3,940 3,541 Weighted average assumptions used to determine obligations at end of year: Discount rate 2.38 % 3.11 % 2.38 % 3.11 % Rate of compensation increase 4.00 % 4.10 % 4.00 % 4.10 % 1 The SCE liability excludes a long-term payable due to Edison International Parent of $139 million and $133 million at December 31, 2020 and 2019, respectively, related to certain SCE postretirement benefit obligations transferred to Edison International Parent. SCE's accumulated other comprehensive loss of $16 million and $17 million at December 31, 2020 and 2019, excludes net losses of $41 million and $37 million related to these benefits, respectively. For Edison International and SCE, respectively, the 2020 actuarial losses are primarily related to $339 million and $305 million in losses from a decrease in the discount rate (from 3.11% as of December 31, 2019 to 2.38% as of December 31, 2020), partially offset by $117 million and $124 million in gains from other economic assumption changes; the 2019 actuarial losses are primarily related to $401 million and $373 million in losses from a decrease in the discount rate (from 4.19% as of December 31, 2018 to 3.11% as of December 31, 2019), partially offset by $157 million and $177 million in gains from other economic assumption changes. Net periodic pension expense components for continuing operations are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Service cost $ 121 $ 114 $ 126 $ 119 $ 111 $ 123 Non-service cost Interest cost 124 155 140 114 143 128 Expected return on plan assets (215) (205) (228) (203) (194) (214) Amortization of prior service cost 2 2 3 1 2 3 Amortization of net loss 10 7 9 7 5 6 Regulatory adjustment (deferred) 16 (3) 15 16 (3) 15 Total non-service benefit (63) (44) (61) (65) (47) (62) Total expense recognized $ 58 $ 70 $ 65 $ 54 $ 64 $ 61 Other changes in pension plan assets and benefit obligations recognized in other comprehensive loss for continuing operations: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Net loss $ 11 $ 19 $ 5 $ 9 $ 21 $ 5 Amortization of net loss (10) (7) (9) (7) (5) (6) Total recognized in other comprehensive loss 1 12 (4) 2 16 (1) Total recognized in expense and other comprehensive loss $ 59 $ 82 $ 61 $ 56 $ 80 $ 60 In accordance with authoritative guidance on rate-regulated enterprises, SCE records regulatory assets and liabilities instead of charges and credits to other comprehensive income (loss) for the portion of SCE's postretirement benefit plans that are recoverable in utility rates. Edison International and SCE used the following weighted average assumptions to determine pension expense for continuing operations: Years ended December 31, 2020 2019 2018 Discount rate 3.11 % 4.19 % 3.46 % Rate of compensation increase 4.10 % 4.10 % 4.10 % Expected long-term return on plan assets 6.00 % 6.50 % 6.50 % Interest crediting rate for cash balance account Starting rate 3.61 % 4.46 % 4.36 % Ultimate rate 5.00 % 5.75 % 5.75 % Year ultimate rate is reached 2025 2022 2022 The following benefit payments, which reflect expected future service, are expected to be paid: (in millions) Edison International SCE 2021 $ 294 $ 254 2022 297 259 2023 298 262 2024 299 266 2025 302 268 2026 – 2030 1,403 1,317 Postretirement Benefits Other Than Pensions ("PBOP(s)") Employees hired prior to December 31, 2017 who are retiring at or after age 55 with at least 10 years of service may be eligible for postretirement healthcare benefits. Eligibility for a company contribution toward the cost of these benefits in retirement depends on a number of factors, including the employee's years of service, age, hire date, and retirement date. Employees hired on or after December 31, 2017 are no longer eligible for retiree healthcare benefits. In lieu of those benefits, the Company will provide a health reimbursement account of $200 per month available only after meeting certain age and service year requirements. Under the terms of the Edison International Welfare Benefit Plan ("PBOP Plan"), each participating employer (Edison International or its participating subsidiaries) is responsible for the costs and expenses of all PBOP Plan benefits with respect to its employees and former employees that exceed the participants' share of contributions. A participating employer may terminate the PBOP Plan benefits with respect to its employees and former employees, as may SCE (as PBOP Plan sponsor), and, accordingly, the participants' PBOP Plan benefits are not vested benefits. The expected contributions (substantially all of which are expected to be made by SCE) for PBOP benefits are $9 million for the year ended December 31, 2021. Annual contributions related to SCE employees made to SCE plans are anticipated to be recovered through CPUC-approved regulatory mechanisms and are expected to be, at a minimum, equal to the total annual expense for these plans. SCE has three voluntary employees' beneficiary association trusts ("VEBA Trusts") that can only be used to pay for retiree health care benefits of SCE and its subsidiaries. Once funded into the VEBA Trusts, neither SCE nor Edison International can subsequently recover remaining amounts in the VEBA Trusts. Participants of the PBOP Plan do not have a beneficial interest in the VEBA Trusts. The VEBA Trust assets are sensitive to changes in market conditions. Changes in overall interest rate levels significantly affect the company's liabilities, while assets held in the various trusts established to fund Edison International's other postretirement benefits are affected by movements in the equity and bond markets. Due to SCE's regulatory recovery treatment, the unfunded status is offset by a regulatory asset. Information on PBOP Plan assets and benefit obligations is shown below: Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Change in benefit obligation Benefit obligation at beginning of year $ 2,083 $ 1,986 $ 2,074 $ 1,977 Service cost 38 30 37 30 Interest cost 63 77 63 77 Actuarial (gain) loss (46) 70 (45) 70 Plan participants' contributions 29 29 29 29 Benefits paid (94) (109) (94) (109) Benefit obligation at end of year $ 2,073 $ 2,083 $ 2,064 $ 2,074 Change in plan assets Fair value of plan assets at beginning of year $ 2,465 $ 2,133 $ 2,464 $ 2,133 Actual return on assets 309 401 309 401 Employer contributions 8 11 8 10 Plan participants' contributions 29 29 29 29 Benefits paid (94) (109) (93) (109) Fair value of plan assets at end of year 2,717 2,465 2,717 2,464 Funded status at end of year $ 644 $ 382 $ 653 $ 390 Amounts recognized in the consolidated balance sheets consist of: Long-term assets $ 663 $ 393 $ 663 $ 402 Current liabilities (10) (11) (10) (12) Long-term liabilities (9) — — — $ 644 $ 382 $ 653 $ 390 Amounts recognized in accumulated other comprehensive loss consist of: Net loss $ 1 $ 2 $ — $ — Amounts recognized as a regulatory liability (671) (416) (671) (416) Total not yet recognized as income $ (670) $ (414) $ (671) $ (416) Weighted average assumptions used to determine obligations at end of year: Discount rate 2.67 % 3.32 % 2.67 % 3.32 % Assumed health care cost trend rates: Rate assumed for following year 6.50 % 6.50 % 6.50 % 6.50 % Ultimate rate 5.00 % 5.00 % 5.00 % 5.00 % Year ultimate rate reached 2029 2029 2029 2029 Net periodic PBOP expense components for continuing operations are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Service cost $ 38 $ 30 $ 37 $ 37 $ 30 $ 37 Non-service cost Interest cost 63 77 80 63 77 80 Expected return on plan assets (119) (111) (121) (119) (111) (122) Amortization of prior service credit (1) (1) (1) (1) (1) (1) Amortization of net gain (29) (17) — (29) (17) — Regulatory adjustment 49 29 24 49 29 24 Total non-service benefit (37) (23) (18) (37) (23) (19) Total expense $ 1 $ 7 $ 19 $ — $ 7 $ 18 In accordance with authoritative guidance on rate-regulated enterprises, SCE records regulatory assets and liabilities instead of charges and credits to other comprehensive income (loss) for the portion of SCE's postretirement benefit plans that are recoverable in utility rates. Edison International and SCE used the following weighted average assumptions to determine PBOP expense for continuing operations: Years ended December 31, 2020 2019 2018 Discount rate 3.32 % 4.35 % 3.70 % Expected long-term return on plan assets 4.90 % 5.30 % 5.30 % Assumed health care cost trend rates: Current year 6.50 % 6.75 % 6.75 % Ultimate rate 5.00 % 5.00 % 5.00 % Year ultimate rate reached 2029 2029 2029 The following benefit payments (net of plan participants' contributions) are expected to be paid: (in millions) Edison International SCE 2021 $ 83 $ 82 2022 84 84 2023 86 86 2024 89 88 2025 90 90 2026 – 2030 475 472 Plan Assets Description of Pension and Postretirement Benefits Other than Pensions Investment Strategies The investment of plan assets is overseen by a fiduciary investment committee. Plan assets are invested using a combination of asset classes and may have active and passive investment strategies within asset classes. Target allocations for 2020 pension plan assets were 23% for U.S. equities, 17% for non-U.S. equities, 45% for fixed income and 15% for opportunistic and/or alternative investments. Target allocations for 2020 PBOP plan assets (except for Represented VEBA which is 95% for fixed income and 5% for U.S. and non-U.S. equities) are 58% for U.S. and non-U.S. equities, 29% for fixed income and 13% for opportunistic and/or alternative investments. Edison International employs multiple investment management firms. Investment managers within each asset class cover a range of investment styles and approaches. Risk is managed through diversification among multiple asset classes, managers, styles and securities. Plan asset classes and individual manager performances are measured against targets. Edison International also monitors the stability of its investment managers' organizations. Allowable investment types include: • United States equities: common and preferred stocks of large, medium, and small companies which are predominantly United States-based. • Non-United States equities: equity securities issued by companies domiciled outside the United States and in depository receipts which represent ownership of securities of non-United States companies. • Fixed income: fixed income securities issued or guaranteed by the United States government, non-United States governments, government agencies and instrumentalities including municipal bonds, mortgage backed securities and corporate debt obligations. A portion of the fixed income positions may be held in debt securities that are below investment grade. • Opportunistic, alternative and other investments: Opportunistic investments in short to intermediate term market opportunities. Investments may have fixed income and/or equity characteristics and may be either liquid or illiquid. Alternative investments are limited partnerships that invest in non-publicly traded entities. Other investments are diversified among multiple asset classes such as global equity, fixed income currency and commodities markets. Investments are made in liquid instruments within and across markets. The investment returns are expected to approximate the plans' expected investment returns. Asset class portfolio weights are permitted to range within plus or minus 3%. Where approved by the fiduciary investment committee, futures contracts are used for portfolio rebalancing and to reallocate portfolio cash positions. Where authorized, a few of the plans' investment managers employ limited use of derivatives, including futures contracts, options, options on futures and interest rate swaps in place of direct investment in securities to gain efficient exposure to markets. Derivatives are not used to leverage the plans or any portfolios. Determination of the Expected Long-Term Rate of Return on Assets The overall expected long-term rate of return on assets assumption is based on the long-term target asset allocation for plan assets and capital markets return forecasts for asset classes employed. A portion of the PBOP trust asset returns are subject to taxation, so the expected long-term rate of return for these assets is determined on an after-tax basis. Capital Markets Return Forecasts SCE's capital markets return forecast methodologies primarily use a combination of historical market data, current market conditions, proprietary forecasting expertise, complex models to develop asset class return forecasts and a building block approach. The forecasts are developed using variables such as real risk-free interest, inflation and asset class specific risk premiums. For equities, the risk premium is based on an assumed average equity risk premium of 5% over cash. The forecasted return on private equity and opportunistic investments are estimated at a 4% premium above public equity, reflecting a premium for higher volatility and lower liquidity. For fixed income, the risk premium is based on a comprehensive modeling of credit spreads. Fair Value of Plan Assets The PBOP Plan and the Southern California Edison Company Retirement Plan Trust ("Master Trust") assets include investments in equity securities, U.S. treasury securities, other fixed-income securities, common/collective funds, mutual funds, other investment entities, foreign exchange and interest rate contracts, and partnership/joint ventures. Equity securities, U.S. treasury securities, mutual and money market funds are classified as Level 1 as fair value is determined by observable, unadjusted quoted market prices in active or highly liquid and transparent markets. The fair value of the underlying investments in equity mutual funds are based on stock-exchange prices. The fair value of the underlying investments in fixed-income mutual funds and other fixed income securities including municipal bonds are based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes, issuer spreads, bids, offers and relevant credit information. Foreign exchange and interest rate contracts are classified as Level 2 because the values are based on observable prices but are not traded on an exchange. Futures contracts trade on an exchange and therefore are classified as Level 1. No investment is classified as Level 3 as of December 31, 2020 and 2019. Common/collective funds and partnerships are measured at fair value using the net asset value per share ("NAV") and have not been classified in the fair value hierarchy. Other investment entities are valued similarly to common/collective funds and are therefore classified as NAV. The Level 1 registered investment companies are either mutual or money market funds. The remaining funds in this category are readily redeemable and classified as NAV and are discussed further at Note 9 to the pension plan master trust investments table below. Edison International reviews the process/procedures of both the pricing services and the trustee to gain an understanding of the inputs/assumptions and valuation techniques used to price each asset type/class. The trustee and Edison International's validation procedures for pension and PBOP equity and fixed income securities are the same as the nuclear decommissioning trusts. For further discussion, see Note 4. The values of Level 1 mutual and money market funds are publicly quoted. The trustees obtain the values of common/collective and other investment funds from the fund managers. The values of partnerships are based on partnership valuation statements updated for cash flows. SCE's investment managers corroborate the trustee fair values. Pension Plan The following table sets forth the Master Trust investments for Edison International and SCE that were accounted for at fair value as of December 31, 2020 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 151 $ 1,006 $ — $ 1,157 Corporate stocks 3 570 5 — 575 Corporate bonds 4 — 601 — 601 Common/collective funds 5 — — 1,017 1,017 Partnerships/joint ventures 6 — — 569 569 Other investment entities 7 — — 137 137 Registered investment companies 8 69 — 23 92 Interest-bearing cash 7 — — 7 Other — 39 — 39 Total $ 797 $ 1,651 $ 1,746 $ 4,194 Receivables and payables, net (23) Combined net plan assets available for benefits 4,171 SCE's share of net plan assets $ 3,940 The following table sets forth the Master Trust investments that were accounted for at fair value as of December 31, 2019 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 146 $ 992 $ — $ 1,138 Corporate stocks 3 547 7 — 554 Corporate bonds 4 — 572 — 572 Common/collective funds 5 — — 693 693 Partnerships/joint ventures 6 — — 471 471 Other investment entities 7 — — 130 130 Registered investment companies 8 133 — — 133 Interest-bearing cash 7 — — 7 Other — 79 — 79 Total $ 833 $ 1,650 $ 1,294 $ 3,777 Receivables and payables, net (22) Combined net plan assets available for benefits 3,755 SCE's share of net plan assets $ 3,541 1 These investments are measured at fair value using the net asset value per share practical expedient and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the net plan assets available for benefits. 2 Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation. 3 Corporate stocks are diversified. Performance for actively managed separate accounts is primarily benchmarked against the Russell Indexes (40%) and Morgan Stanley Capital International (MSCI) index (60%), at both December 31, 2020 and 2019. 4 Corporate bonds are diversified. At December 31, 2020 and 2019, respectively, this category includes $54 million and $45 million for collateralized mortgage obligations and other asset backed securities. 5 At December 31, 2020 and 2019, respectively, the common/collective assets were invested in equity index funds that seek to track performance of the Standard and Poor's 500 Index (37% and 35%) and Russell 1000 indexes (13% and 17%). In addition, at December 31, 2020 and 2019, respectively, 40% and 28% of the assets in this category are in index funds which seek to track performance in the MSCI All Country World Index exUS and 8% and 12% of this category are in non-index U.S. equity fund, which is actively managed. 6 At December 31, 2020 and 2019, respectively, 49% and 51% are invested in private equity funds with investment strategies that include branded consumer products and clean technology companies, 23% and 17% are invested in ABS including distressed mortgages and commercial and residential loans, 4% and 8% are invested in a broad range of financial assets in all global markets. 19% are invested in publicly traded fixed income securities for both periods. 7 At both December 31, 2020 and 2019, other investment entities were invested in (1) emerging market equity securities and (2) domestic mortgage backed securities. 8 Level 1 registered investment companies primarily consisted of a global equity mutual fund which seeks to outperform the MSCI World Total Return Index. In addition, investments included fixed income fund used for cash management at December 31, 2020. At December 31, 2020 and 2019, respectively, approximately 59% and 56% of the publicly traded equity investments, including equities in the common/collective funds, were located in the United States. Postretirement Benefits Other than Pensions The following table sets forth the VEBA Trust assets for Edison International and SCE that were accounted for at fair value as of December 31, 2020 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 380 $ 30 $ — $ 410 Corporate stocks 3 224 3 — 227 Corporate notes and bonds 4 — 1,079 — 1,079 Common/collective funds 5 — — 693 693 Partnerships 6 — — 81 81 Registered investment companies 7 65 — — 65 Interest bearing cash — 26 — 26 Other 8 — 132 — 132 Total $ 669 $ 1,270 $ 774 $ 2,713 Receivables and payables, net 4 Combined net plan assets available for benefits 2,717 SCE's share of net plan assets $ 2,717 The following table sets forth the VEBA Trust assets for Edison International and SCE that were accounted for at fair value as of December 31, 2019 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 386 $ 63 $ — $ 449 Corporate stocks 3 242 2 — 244 Corporate notes and bonds 4 — 885 — 885 Common/collective funds 5 — — 652 652 Partnerships 6 — — 68 68 Registered investment companies 7 66 — — 66 Interest bearing cash — 17 — 17 Other 8 2 101 — 103 Total $ 696 $ 1,068 $ 720 $ 2,484 Receivables and payables, net (19) Combined net plan assets available for benefits 2,465 SCE's share of net plan assets $ 2,464 1 These investments are measured at fair value using the net asset value per share practical expedient and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the net plan assets available for benefits. 2 Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association. 3 Corporate stock performance for actively managed separate accounts is primarily benchmarked against the Russell Indexes (70% and 68%) and the MSCI All Country World Index (30% and 32%) for 2020 and 2019, respectively. 4 Corporate notes and bonds are diversified and include approximately $170 million and $49 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2020 and 2019, respectively. 5 At December 31, 2020 and 2019, respectively, 70% and 74% of the common/collective assets are invested in index funds which seek to track performance in the MSCI All Country World Index Investable Market Index. 22% and 19% are invested in a non-index U.S. equity fund which is actively managed. The remaining assets in this category are primarily invested in emerging market fund. 6 At December 31, 2020 and 2019, respectively, 46% and 55% of the partnerships are invested in private equity and venture capital funds. Investment strategies for these funds include branded consumer products, clean and information technology and healthcare. 36% and 28% of the remaining partnerships category are invested in asset backed securities including distressed mortgages, distressed companies and commercial and residential loans and debt and equity of banks. 18% and 15% are invested in a broad range of financial assets in all global markets. 7 At both December 31, 2020 and 2019, registered investment companies were primarily invested in a money market fund and exchange rate trade funds which seek to track performance of MSCI Emerging Market Index, Russell 2000 Index and international small cap equities. 8 Other includes $61 million and $66 million of municipal securities at December 31, 2020 and 2019, respectively. At December 31, 2020 and 2019, respectively, approximately 66% and 65% of the publicly traded equity investments, including equities in the common/collective funds, were located in the United States. Stock-Based Compensation Edison International maintains a shareholder-approved incentive plan (the "2007 Performance Incentive Plan") that includes stock-based compensation. The maximum number of shares of Edison International's common stock authorized to be issued or transferred pursuant to awards under the 2007 Performance Incentive Plan, as amended, is approximately 71 million shares. As of December 31, 2020, Edison International had approximately 23 million shares remaining available for new award grants under its stock-based compensation plans. The following table summarizes total expense and tax benefits associated with stock-based compensation: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Stock-based compensation expense 1 : Stock options $ 15 $ 13 $ 11 $ 7 $ 7 $ 6 Performance shares 5 8 1 2 4 1 Restricted stock units 8 6 7 4 3 4 Other 1 2 2 — — — Total stock-based compensation expense 29 29 21 13 14 11 Income tax benefits related to stock compensation expense $ 4 $ 10 $ 6 $ 3 $ 6 $ 3 1 Reflected in "Operation and maintenance" on Edison International's and SCE's consolidated statements of income. Stock Options Under the 2007 Performance Incentive Plan, Edison International has granted stock options at exercise prices equal to the closing price at the grant date. Edison International may grant stock options and other awards related to, or with a value derived from, its common stock to directors and certain employees. Options generally expire 10 years after the grant date and vest over a period of four years of continuous service in equal annual increments, except for awards granted to retirement-eligible participants, which vest on an accelerated basis. The fair value for each option granted was determined as of the grant date using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model requires various assumptions noted in the following table: Years ended December 31, 2020 2019 2018 Expected terms (in years) 5.2 5.5 5.7 Risk-free interest rate 0.4% - 0.6% 1.6% - 2.3% 2.6% - 3.0% Expected dividend yield 4.2% - 5.0% 3.3% - 4.0% 3.6% - 4.3% Weighted average expected dividend yield 4.7% 3.9% 3.8% Expected volatility 24.9% - 26.9% 21.7% -24.1% 20.9% - 21.9% Weighted average volatility 25.0% 21.8% 20.9% The expected term represents the period of time for which the options are expected to be outstanding and is primarily based on historical exercise and post-vesting cancellation experience and stock price history. The risk-free interest rate for periods within the contractual life of the option is based on a zero-coupon U.S. Treasury STRIPS (separate trading of registered interest and principal of securities) whose maturity corresponds to the option's expected term on the measurement date. Expected volatility is based on the historical volatility of Edison International's common stock for the length of the option's expected term for 2020. The volatility period used was 63 months, 66 months and 68 months at December 31, 2020, 2019 and 2018, respectively. The following is a summary of the status of Edison International's stock options: Weighted Average Stock Options Exercise Remaining Aggregate Edison International: Outstanding at December 31, 2019 9,278,677 $ 62.27 Granted 1,993,954 68.60 Forfeited or expired (203,340) 65.75 Exercised 1 (359,908) 48.59 Outstanding at December 31, 2020 10,709,383 63.85 6.03 Vested and expected to vest at December 31, 2020 10,391,796 63.60 6.17 $ 30 Exercisable at December 31, 2020 6,489,876 $ 62.08 4.83 $ 27 SCE: Outstanding at December 31, 2019 4,934,702 $ 61.01 Granted 1,053,923 68.27 Forfeited or expired (189,691) 65.75 Exercised 1 (302,911) 49.49 Affiliate transfers, net (5,535) 63.36 Outstanding at December 31, 2020 5,490,488 62.85 5.86 Vested and expected to vest at December 31, 2020 5,325,052 62.50 5.98 $ 20 Exercisable at December 31, 2020 3,361,238 $ 60.41 4.56 $ 19 1 Edison International and SCE recognized tax benefits of $2 million and $2 million, respectively, from stock options exercised in 2020. At December 31, 2020, total unrecognized compensation cost related to stock options and the weighted average period the cost is expected to be recognized are as follows: Edison International SCE Unrecognized compensation cost, net of expected forfeitures (in millions) $ 17 $ 9 Weighted average period (in years) 2.3 2.3 Supplemental Data on Stock Options Edison International SCE Years ended December 31, (in millions, except per award amounts) 2020 2019 2018 2020 2019 2018 Stock options: Weighted average grant date fair value per option granted $ 8.18 $ 8.80 $ 8.21 $ 8.16 $ 8.83 $ 8.22 Fair value of options vested 2 14 14 2 7 7 Value of options exercised 9 27 10 7 19 7 Performance Shares A target number of contingent performance shares were awarded to executives in March 2020, 2019 and 2018 and vest at December 31, 2022, 2021 and 2020, respectively. The vesting of the grants is dependent upon market and financial performance and service conditions as defined in the grants for each of the years. The number of performance shares earned from each year's grants could range from zero to twice the target number (plus additional units credited as dividend equivalents). The fair value of market condition performance shares is determined using a Monte Carlo simulation valuation model for the total shareholder return. The fair value of financial performance condition performance shares is determined (i) at grant as the target number of shares (which E

Investments

Investments	12 Months Ended
	Dec. 31, 2020
Regulated Entity, Other Assets, Noncurrent [Abstract]
Investments	Investments Nuclear Decommissioning Trusts Future decommissioning costs related to SCE's nuclear assets are expected to be funded from independent decommissioning trusts. The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments): Longest Amortized Cost Fair Value December 31, (in millions) 2020 2019 2020 2019 Stocks — N/A N/A $ 1,908 $ 1,765 Municipal bonds 2057 1,013 822 1,218 970 U.S. government and agency securities 2067 740 996 864 1,115 Corporate bonds 2070 460 597 550 679 Short-term investments and receivables/payables 1 One-year 281 32 293 33 Total $ 2,494 $ 2,447 $ 4,833 $ 4,562 1 Short-term investments include $138 million and $41 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2021 and January 2, 2020 as of December 31, 2020 and 2019, respectively. Trust fund earnings (based on specific identification) increase the trust fund balance and the ARO regulatory liability. Unrealized holding gains, net of losses, were $2.1 billion and $1.8 billion at December 31, 2020 and 2019, respectively. Trust assets are used to pay income taxes. Deferred tax liabilities related to net unrealized gains were $515 million and $449 million at December 31, 2020 and December 31, 2019, respectively. Accordingly, the fair value of trust assets available to pay future decommissioning costs, net of deferred income taxes, totaled $4.3 billion and $4.1 billion at December 31, 2020 and December 31, 2019, respectively. The following table summarizes the gains and losses for the trust investments: December 31, (in millions) 2020 2019 2018 Gross realized gains $ 255 $ 87 $ 134 Gross realized losses (6) (2) (27) Net unrealized gains (losses) for equity securities 176 343 (233) Due to regulatory mechanisms, changes in assets of the trusts from income or loss items have no impact on operating revenue or earnings.

Regulatory Assets and Liabiliti

Regulatory Assets and Liabilities	12 Months Ended
	Dec. 31, 2020
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Assets and Liabilities	Regulatory Assets and Liabilities Included in SCE's regulatory assets and liabilities are regulatory balancing accounts. CPUC-authorized balancing account mechanisms require SCE to refund or recover any differences between forecasted and actual costs. The CPUC has authorized balancing accounts for specified costs or programs such as fuel, purchased power, demand-side management programs, nuclear decommissioning and public purpose programs. Certain of these balancing accounts include a return on rate base of 7.68% and 7.61% in 2020 and 2019, respectively. The CPUC authorizes the use of a balancing account to recover from or refund to customers differences in revenue resulting from actual and forecasted electricity sales. Amounts included in regulatory assets and liabilities are generally recorded with corresponding offsets to the applicable income statement accounts. Regulatory Assets SCE's regulatory assets included on the consolidated balance sheets are: December 31, (in millions) 2020 2019 Current: Regulatory balancing and memorandum accounts $ 1,127 $ 798 Power contracts 165 189 Other 22 22 Total current 1,314 1,009 Long-term: Deferred income taxes, net of liabilities 4,475 4,026 Pension and other postretirement benefits 12 87 Power contracts 239 434 Unamortized investments, net of accumulated amortization 1 114 119 Unamortized loss on reacquired debt 133 142 Regulatory balancing and memorandum accounts 1,794 981 Environmental remediation 247 237 Other 106 62 Total long-term 7,120 6,088 Total regulatory assets $ 8,434 $ 7,097 1 Relates to a regulatory asset that earns a rate of return. See below for further information. In accordance with the accounting standards applicable to rate-regulated enterprises, SCE defers costs as regulatory assets that are probable of future recovery from customers and has recorded regulatory assets for these incremental costs at December 31, 2020. While SCE believes such costs are probable of future recovery, there is no assurance that SCE will collect all amounts currently deferred as regulatory assets. SCE's regulatory assets related to power contracts primarily represent derivative contracts that were designated as normal purchases and normal sales contracts. The liabilities for these power contracts are amortized over the remaining contract terms, approximately 2 to 3 years. For further information, see Note 1. SCE's regulatory assets related to deferred income taxes represent tax benefits passed through to customers. The CPUC requires SCE to flow through certain deferred income tax benefits to customers by reducing electricity rates, thereby deferring recovery of such amounts to future periods. Based on current regulatory ratemaking and income tax laws, SCE expects to recover its regulatory assets related to deferred income taxes over the life of the assets that give rise to the accumulated deferred income taxes, approximately from 1 to 60 years. For further information, see Note 8. SCE has long-term unamortized investments which include nuclear assets related to Palo Verde and the beyond the meter program. Nuclear assets related to Palo Verde and the beyond the meter program are expected to be recovered by 2044 and 2027, respectively, and earned returns of 7.68% and 7.61% in 2020 and 2019, respectively. SCE's net regulatory asset related to its unamortized loss on reacquired debt will be recovered over the original amortization period of the reacquired debt over periods ranging from 10 to 40 years or the life of the new issuance if the debt is refunded or refinanced. SCE's regulatory assets related to environmental remediation represent a portion of the costs incurred at certain sites that SCE is allowed to recover through customer rates. See "Environmental Remediation" discussed in Note 12. Regulatory Liabilities SCE's regulatory liabilities included on the consolidated balance sheets are: December 31, (in millions) 2020 2019 Current: Regulatory balancing and memorandum accounts $ 471 $ 883 Energy derivatives 87 80 Other 11 9 Total current 569 972 Long-term: Costs of removal 2,595 2,674 Re-measurement of deferred taxes 2,283 2,424 Recoveries in excess of ARO liabilities 1,930 1,569 Regulatory balancing and memorandum accounts 1,062 1,261 Other postretirement benefits 671 416 Other 48 41 Total long-term 8,589 8,385 Total regulatory liabilities $ 9,158 $ 9,357 SCE's regulatory liabilities related to energy derivatives are primarily an offset to unrealized gains on derivatives. SCE's regulatory liabilities related to costs of removal represent differences between asset removal costs recorded in depreciation and amounts collected in rates for those costs. As a result of Tax Reform, SCE's deferred tax assets and liabilities were re-measured at December 31, 2017, resulting in the initial recording of regulatory liabilities. The amount was further adjusted for CPUC's final resolution in February 2019, which stated that customers are only entitled to re-measurement of deferred taxes that were included when setting rates (i.e. included in rate base), and that all other deferred tax re-measurements belong to shareholders. The regulatory liabilities are generally expected to be refunded to customers over the lives of the assets and liabilities that gave rise to the deferred taxes. SCE's regulatory liabilities related to recoveries in excess of ARO liabilities represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of the SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments. See Note 10 for further discussion. SCE's regulatory liabilities related to other postretirement benefits represent the overfunded net actuarial gain. This amount will be refunded through rates charged to customers. See "Pension Plans and Postretirement Benefits Other than Pensions" discussion in Note 9. Net Regulatory Balancing and Memorandum Accounts Balancing accounts track amounts that the CPUC or FERC have authorized for recovery. Balancing account over and under collections represent differences between cash collected in current rates for specified forecasted costs and such costs that are actually incurred. Undercollections are recorded as regulatory balancing account assets. Overcollections are recorded as regulatory balancing account liabilities. With some exceptions, SCE seeks to adjust rates on an annual basis or at other designated times to recover or refund the balances recorded in its balancing accounts. Memorandum accounts are authorized to track costs for potential future recovery. Regulatory balancing and memorandum accounts that SCE does not expect to collect or refund in the next 12 months are reflected in the long-term section of the consolidated balance sheets. Regulatory balancing and memorandum accounts that do not have the right of offset are presented gross in the consolidated balance sheets. Under and over collections in balancing accounts and amounts recorded in memorandum accounts typically accrue interest based on a three-month commercial paper rate published by the Federal Reserve. The following table summarizes the significant components of regulatory balancing and memorandum accounts included in the above tables of regulatory assets and liabilities: December 31, (in millions) 2020 2019 Asset (liability) Energy resource recovery account $ (89) $ (23) Portfolio allocation balancing account 497 537 New system generation balancing account (10) 85 Public purpose programs and energy efficiency programs (1,130) (1,244) Base revenue requirement balancing account 622 (328) Greenhouse gas auction revenue and low carbon fuel standard revenue (125) (196) FERC balancing accounts 12 (127) Wildfire and drought restoration accounts 1 361 120 Wildfire-related memorandum accounts 2 1,104 748 COVID-19-related memorandum accounts 3 176 — Other (30) 63 Asset (Liability) $ 1,388 $ (365) 1 The wildfire and drought restoration accounts regulatory assets represent restorative costs that are recorded in a Catastrophic Event Memorandum Account ("CEMA"). 2 The wildfire-related memorandum accounts regulatory assets represent wildfire-related costs that are probable of future recovery from customers, subject to a reasonableness review. The Fire Hazard Prevention Memorandum Account ("FHPMA") is used to track costs related to fire safety and to implement fire prevention corrective action measures in extreme and very high fire threat areas. The Wildfire Expense Memorandum Account ("WEMA") is used to track incremental wildfire insurance costs and uninsured wildfire-related financing, legal and claims costs. During 2019, the CPUC approved a Wildfire Mitigation Plan memorandum account to track costs incurred to implement SCE's Wildfire Mitigation Plan that are not currently reflected in SCE's revenue requirements, a Grid Safety and Resiliency Program Memorandum Account ("GSRPMA") to track the costs of SCE's GS&RP that are incremental to costs approved for recovery in SCE's 2018 GRC and a fire risk mitigation memorandum account to track costs related to the reduction of fire risk that are incremental to costs approved for recovery in SCE's 2018 GRC that are not tracked in any other wildfire-related memorandum account.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Power Purchase Agreements SCE entered into various agreements to purchase power, electric capacity and other energy products. At December 31, 2020, the undiscounted future expected minimum payments for the SCE PPAs (primarily related to renewable energy contracts), which were approved by the CPUC and met other critical contract provisions (including completion of major milestones for construction), were as follows: (in millions) Total 2021 $ 3,144 2022 3,066 2023 2,937 2024 2,349 2025 2,236 Thereafter 21,756 Total future commitments 1 $ 35,488 1 Certain power purchase agreements are treated as operating or finance leases. For further discussion, see Note 13. Includes lease contracts commencing in 2021, 2022 and 2023 with future short-term lease expense of $242 million in 2021 and long-term minimum lease payments of $866 million. Additionally, as of December 31, 2020, SCE has executed contracts (including capacity reduction contracts) that have not met the critical contract provisions that would increase contractual obligations by $29 million in 2021, $72 million in 2022, $93 million in 2023, $111 million in 2024, $111 million in 2025 and $1.2 billion thereafter, if all critical contract provisions are completed. Costs incurred for PPAs were $3.8 billion in 2020, $3.7 billion in 2019 and $3.8 billion in 2018, which include costs associated with contracts with terms of less than one year. Other Commitments The following summarizes the estimated minimum future commitments for SCE's other commitments: (in millions) 2021 2022 2023 2024 2025 Thereafter Total Other contractual obligations $ 46 $ 43 $ 43 $ 45 $ 37 $ 154 $ 368 Costs incurred for other commitments were $80 million in 2020, $110 million in 2019 and $124 million in 2018. Other commitments include fuel supply contracts for Palo Verde which require payment only if the fuel is made available for purchase. Also included are commitments related to maintaining reliability and expanding SCE's transmission and distribution system. The table above does not include asset retirement obligations, which are discussed in Note 1. Indemnities Edison International and SCE have various financial and performance guarantees and indemnity agreements which are issued in the normal course of business. Edison International and SCE have agreed to provide indemnifications through contracts entered into in the normal course of business. These are primarily indemnifications against adverse litigation outcomes in connection with underwriting agreements, indemnities for specified environmental liabilities and income taxes with respect to assets sold or other contractual arrangements. Edison International's and SCE's obligations under these agreements may or may not be limited in terms of time and/or amount, and in some instances Edison International and SCE may have recourse against third parties. Edison International and SCE have not recorded a liability related to these indemnities. The overall maximum amount of the obligations under these indemnifications cannot be reasonably estimated. Contingencies In addition to the matters disclosed in these Notes, Edison International and SCE are involved in other legal, tax and regulatory proceedings before various courts and governmental agencies regarding matters arising in the ordinary course of business. Edison International and SCE believe the outcome of each of these other proceedings will not materially affect its financial position, results of operations and cash flows. Southern California Wildfires and Mudslides Wildfires in SCE's territory, including those where SCE's equipment may be alleged to be associated with the fire's ignition, have caused loss of life and substantial damage in recent years. Multiple factors have contributed to increased wildfire activity and faster progression of wildfires across SCE's service territory and in other areas of California. These include the buildup of dry vegetation in areas severely impacted by years of historic drought, lack of adequate clearing of hazardous fuels by responsible parties, higher temperatures, lower humidity, increased incidence of dry lightning, and strong Santa Ana winds. At the same time that wildfire risk has been increasing in Southern California, residential and commercial development has occurred and is occurring in some of the highest-risk areas. Such factors can increase the likelihood and extent of wildfires. SCE has determined that approximately 27% of its service territory is in areas identified as high fire risk. California has experienced unprecedented weather conditions in recent years and SCE's service territory remains susceptible to additional wildfire activity in 2021 and beyond. The worsening conditions across California increase the likelihood of wildfires, including those where SCE's equipment may be alleged to be associated with the fire's ignition. In response to worsening weather and fuel conditions and increased wildfire activity over the past several years, SCE has developed and is implementing its 2020 – 2022 Wildfire Mitigation Plan ("WMP") to reduce the risk of SCE equipment contributing to the ignition of wildfires. In addition, California has increased its investment in wildfire suppression capabilities. In addition to the investments SCE is making through its WMP, SCE also uses its Public Safety Power Shutoffs ("PSPS") program to proactively de-energize power lines to mitigate the risk of catastrophic wildfires during extreme weather events. SCE initiated PSPS 12 times in 2020 as part of its wildfire mitigation efforts, impacting an aggregate of approximately 140,000 unique customers. In January 2021, the President of the CPUC sent SCE a letter expressing her concern regarding SCE's execution of PSPS in 2020 and notifying SCE that it must implement a PSPS action plan to reduce the impacts of PSPS on the customers and communities it serves. On a risk-informed basis, SCE is making efforts to reduce the frequency and impacts of PSPS in 2021 as compared to 2020, assuming that weather patterns in 2021 are similar to those experienced in 2020. SCE may be subject to mandated changes to, or restrictions on, its operational PSPS practices, regulatory fines and penalties, claims for damages and reputational harm if SCE does not execute PSPS in compliance with applicable rules and regulations or if it is determined that SCE has placed excessive reliance on PSPS. Edison International and SCE accrued estimated losses of $1,328 million in 2020 for wildfire-related claims, net of expected insurance recoveries. The 2020 charge includes an increase in estimated losses for claims related to the 2017/2018 Wildfire/Mudslide Events (defined below) of $1,297 million, against which SCE has recorded expected recoveries through FERC electric rates of $84 million. The resulting charge was $1,213 million ($874 million after-tax). The 2020 charge also includes $31 million ($21 million after FERC recovery and after-tax) of expenses primarily associated with self-insured retention related to the 2019/2020 Wildfires (defined below). Edison International and SCE have incurred material losses in connection with the 2017/2018 Wildfire/Mudslide Events, which are described below. Several wildfires have originated in Southern California subsequent to 2018, however, Edison International and SCE expect that any losses incurred in connection with these fires will be covered by insurance, subject to self-insured retentions and co-insurance, and expect that any such losses after insurance recoveries will not be material. Liability Overview The extent of liability for wildfire-related damages in actions against utilities depends on a number of factors, including whether the utility substantially caused or contributed to the damages and whether parties seeking recovery of damages will be required to show negligence in addition to causation. California courts have previously found utilities to be strictly liable for property damage along with associated interest and attorneys' fees, regardless of fault, by applying the theory of inverse condemnation when a utility's facilities were determined to be a substantial cause of a wildfire that caused the property damage. If inverse condemnation is held to be inapplicable to SCE in connection with a wildfire, SCE still could be held liable for property damages and associated interest if the property damages were found to have been proximately caused by SCE's negligence. If SCE were to be found negligent, SCE could also be held liable for, among other things, fire suppression costs, business interruption losses, evacuation costs, clean-up costs, medical expenses, and personal injury/wrongful death claims. Additionally, SCE could potentially be subject to fines for alleged violations of CPUC rules and state laws in connection with the ignition of a wildfire. Final determinations of liability for wildfire events, including determinations of whether SCE was negligent, would only be made during lengthy and complex litigation processes. Even when investigations are still pending or liability is disputed, an assessment of likely outcomes, including through future settlement of disputed claims, may require estimated losses to be accrued under accounting standards. Each reporting period, management reviews its loss estimates for remaining alleged and potential claims related to wildfire events. The process for estimating losses associated with alleged and potential wildfire-related claims requires management to exercise significant judgment based on a number of assumptions and subjective factors, including, but not limited to: estimates of known and expected claims by third parties based on currently available information, opinions of counsel regarding litigation risk, the status of and developments in the course of litigation, and prior experience litigating and settling wildfire litigation claims. As additional information becomes available, management's estimates and assumptions regarding the causes and financial impact of wildfire events may change. 2019/2020 Wildfires Several wildfires significantly impacted portions of SCE's service territory in 2019 and 2020 (the wildfires that originated in Southern California in 2019 and 2020 where SCE's equipment may be alleged to be associated with the fire's ignition are referred to collectively as the "2019/2020 Wildfires"). Edison International and SCE expect that any losses incurred in connection with the 2019/2020 Wildfires will be covered by insurance, subject to self-insured retentions and co-insurance, and expect that any such losses after insurance recoveries will not be material. As of December 31, 2020, Edison International and SCE had estimated losses (established at the lower end of the reasonably estimated range of expected losses) of $117 million reflected on their consolidated balance sheets related to the 2019/2020 Wildfires. As of the same date, Edison International and SCE also had assets for expected recoveries from insurance of $75 million and expected recoveries from FERC of $3 million on their consolidated balance sheets related to the 2019/2020 Wildfires. One of the 2019/2020 Wildfires, the "Saddle Ridge" Fire, originated in Los Angeles county in October 2019 and burned approximately 9,000 acres, destroyed an estimated 19 structures, damaged an estimated 88 structures, and resulted in injuries to 8 individuals and one fatality. An investigation into the cause of the Saddle Ridge Fire is being led by the Los Angeles Fire Department. Based on pending litigation and without considering insurance recoveries, it is reasonably possible that SCE will incur a material loss in connection with the Saddle Ridge Fire, but the range of possible losses that could be incurred cannot be estimated at this time. SCE has not accrued a charge for potential losses relating to the Saddle Ridge Fire. Another of the 2019/2020 Wildfires, the "Bobcat Fire" was reported in the vicinity of Cogswell Dam in Los Angeles County, California in September 2020. The United States Forest Service ("USFS") has reported that the Bobcat Fire burned approximately 116,000 acres in Los Angeles County, destroyed an estimated 87 homes, 1 commercial property and 83 minor structures, damaged an estimated 28 homes and 19 minor structures, and resulted in injuries to 6 firefighters. In addition, the USFS has estimated suppression costs at $80 million. A camera in the vicinity of Cogswell Dam captured the initial stages of a fire with the first observed smoke approximately six minutes before an SCE circuit in the area experienced an anomaly (a relay). An investigation into the cause of the Bobcat Fire is being led by the USFS, and the USFS has taken a specific section of an SCE overhead conductor in the vicinity of Cogswell Dam into possession as part of its investigation. SCE understands that the USFS has also taken three tree branches in the area into possession. The SED is also conducting an investigation of the Bobcat Fire. SCE has accrued a charge for potential losses relating to the Bobcat Fire. The accrued charge corresponds to the lower end of the reasonably estimated range of expected losses that may be incurred in connection with the Bobcat Fire and is subject to change as additional information becomes available. 2017/2018 Wildfire/Mudslide Events Wildfires in SCE's territory in December 2017 and November 2018 caused loss of life, substantial damage to both residential and business properties, and service outages for SCE customers. The investigating government agencies, the Ventura County Fire Department ("VCFD") and California Department of Forestry and Fire Protection ("CAL FIRE"), have determined that the largest of the 2017 fires in SCE's territory originated on December 4, 2017, in the Anlauf Canyon area of Ventura County (the investigating agencies refer to this fire as the "Thomas Fire"), followed shortly thereafter by a second fire that originated near Koenigstein Road in the City of Santa Paula (the "Koenigstein Fire"). The December 4, 2017 fires eventually burned substantial acreage in both Ventura and Santa Barbara Counties. According to CAL FIRE, the Thomas and Koenigstein Fires, collectively, burned over 280,000 acres, destroyed or damaged an estimated 1,343 structures and resulted in two confirmed fatalities. The largest of the November 2018 fires in SCE's territory, known as the "Woolsey Fire," originated in Ventura County and burned acreage in both Ventura and Los Angeles Counties. According to CAL FIRE, the Woolsey Fire burned almost 100,000 acres, destroyed an estimated 1,643 structures, damaged an estimated 364 structures and resulted in three confirmed fatalities. Two additional fatalities have been associated with the Woolsey Fire. The Thomas Fire, the Koenigstein Fire, the Montecito Mudslides (defined below) and the Woolsey Fire are each referred to as a "2017/2018 Wildfire/Mudslide Event," and, collectively, referred to as the "2017/2018 Wildfire/Mudslide Events." As described below, multiple lawsuits related to the Thomas and Koenigstein Fires and the Woolsey Fire have been initiated against SCE and Edison International. Some of the Thomas and Koenigstein Fires lawsuits claim that SCE and Edison International have responsibility for the damages caused by debris flows and flooding in Montecito and surrounding areas in January 2018 (the "Montecito Mudslides") based on a theory alleging that SCE has responsibility for the Thomas and/or Koenigstein Fires and further alleging that the Thomas and/or Koenigstein Fires proximately caused the Montecito Mudslides. According to Santa Barbara County initial reports, the Montecito Mudslides destroyed an estimated 135 structures, damaged an estimated 324 structures, and resulted in 21 confirmed fatalities, with two additional fatalities presumed. Based on information available to SCE and consideration of the risks associated with litigation, Edison International and SCE expect to incur a material loss in connection with the remaining alleged and potential claims related to the 2017/2018 Wildfire/Mudslide Events. The 2017/2018 Wildfire/Mudslide Events are discussed further below. As of December 31, 2020, Edison International and SCE had paid $1.8 billion in settlements and had estimated losses of $4.4 billion reflected on their consolidated balance sheets related to the 2017/2018 Wildfire/Mudslide Events, consisting of $2.2 billion subject to settlements executed after December 31, 2020 and $2.2 billion for remaining alleged and potential claims. As of the same date, Edison International and SCE also had assets for remaining expected recoveries from insurance of $708 million, reflected as a short-term asset, and through FERC electric rates of $89 million on their consolidated balance sheets related to the 2017/2018 Wildfire/Mudslide Events. The estimated losses for the 2017/2018 Wildfire/Mudslide Events do not include an estimate of any potential fines or penalties that could be levied against SCE in connection with the 2017/2018 Wildfire/Mudslide Events. Edison International and SCE are currently unable to reasonably estimate the magnitude of any such fines or penalties, or the associated timing if they were to be imposed. Estimated losses for the 2017/2018 Wildfire/Mudslide Events litigation are based on a number of assumptions and are subject to change as additional information becomes available. Actual losses incurred may be higher or lower than estimated based on several factors, including: the uncertainty as to the legal and factual determinations to be made during litigation, including uncertainty as to the contributing causes of the 2017/2018 Wildfire/Mudslide Events, the complexities associated with fires that merge, whether inverse condemnation will be held applicable to SCE with respect to damages caused by the Montecito Mudslides, the preliminary nature of the litigation processes, the uncertainty in estimating damages that may be alleged, and the uncertainty as to how these factors impact future settlements. The CPUC and FERC may not allow SCE to recover uninsured losses through electric rates if it is determined that such losses were not reasonably or prudently incurred. See "Loss Estimates for Third Party Claims and Potential Recoveries from Insurance and through Electric Rates" below for additional information. External Investigations and Internal Review The VCFD and CAL FIRE have jointly issued reports concerning their findings regarding the causes of the Thomas Fire and the Koenigstein Fire. The reports did not address the causes of the Montecito Mudslides. SCE has also received a non-final redacted draft of a report from the VCFD regarding Woolsey Fire (the "Redacted Woolsey Report"). SCE anticipates that the VCFD will release its final report regarding the Woolsey Fire in 2021. The VCFD and CAL FIRE findings do not determine legal causation of or assign legal liability for the Thomas, Koenigstein or Woolsey Fires; final determinations of legal causation and liability would only be made during lengthy and complex litigation. The CPUC's Safety and Enforcement Division ("SED") is also conducting investigations to assess SCE's compliance with applicable rules and regulations in areas impacted by the Thomas, Koenigstein and Woolsey Fires and the CPUC may initiate proceedings to investigate these matters after the SED's investigations are completed. Edison International and SCE understand that the California Attorney General's Office has completed its investigation of the Thomas Fire without pursuing criminal charges. Edison International and SCE are aware of an ongoing investigation by the California Attorney General's Office of the Woolsey Fire for the purpose of determining whether any criminal violations have occurred. SCE could be subject to material fines, penalties, or restitution if it is determined that it failed to comply with applicable laws and regulations. SCE is not aware of any basis for felony liability with regards to the Thomas Fire, the Koenigstein Fire or the Woolsey Fire. SCE's internal review into the facts and circumstances of each of the 2017/2018 Wildfire/Mudslide Events is complex and time consuming. SCE expects to obtain and review additional information and materials in the possession of third parties during the course of its internal reviews and the litigation processes. Thomas Fire On March 13, 2019, the VCFD and CAL FIRE jointly issued a report concluding, after ruling out other possible causes, that the Thomas Fire was started by SCE power lines coming into contact during high winds, resulting in molten metal falling to the ground. However, the report does not state that their investigation found molten metal on the ground. At this time, based on available information, SCE has not determined whether its equipment caused the Thomas Fire. Based on publicly available radar data showing a smoke plume in the Anlauf Canyon area emerging in advance of the report's indicated start time, SCE believes that the Thomas Fire started at least 12 minutes prior to any issue involving SCE's system and at least 15 minutes prior to the start time indicated in the report. SCE is continuing to assess the extent of damages that may be attributable to the Thomas Fire. Koenigstein Fire On March 20, 2019, the VCFD and CAL FIRE jointly issued a report finding that the Koenigstein Fire was caused when an energized SCE electrical wire separated and fell to the ground along with molten metal particles and ignited the dry vegetation below. As previously disclosed, SCE believes that its equipment was associated with the ignition of the Koenigstein Fire. SCE is continuing to assess the extent of damages that may be attributable to the Koenigstein Fire. Montecito Mudslides SCE's internal review includes inquiry into whether the Thomas and/or Koenigstein Fires proximately caused or contributed to the Montecito Mudslides, whether, and to what extent, the Thomas and/or Koenigstein Fires were responsible for the damages in the Montecito area and other factors that potentially contributed to the losses that resulted from the Montecito Mudslides. Many other factors, including, but not limited to, weather conditions and insufficiently or improperly designed and maintained debris basins, roads, bridges and other channel crossings, could have proximately caused, contributed to or exacerbated the losses that resulted from the Montecito Mudslides. At this time, based on available information, SCE has not been able to determine whether the Thomas Fire or the Koenigstein Fire, or both, were responsible for the damages in the Montecito area. In the event that SCE is determined to have caused the fire that spread to the Montecito area, SCE cannot predict whether, if fully litigated, the courts would conclude that the Montecito Mudslides were caused or contributed to by the Thomas and/or Koenigstein Fires or that SCE would be liable for some or all of the damages caused by the Montecito Mudslides. Woolsey Fire SCE's internal review into the facts and circumstances of the Woolsey Fire is ongoing. SCE has reported to the CPUC that there was an outage on SCE's electric system in the vicinity of where the Woolsey Fire reportedly began on November 8, 2018. SCE is aware of witnesses who saw fire in the vicinity of SCE's equipment at the time the fire was first reported. While SCE did not find evidence of downed electrical wires on the ground in the suspected area of origin, it observed a pole support wire in proximity to an electrical wire that was energized prior to the outage. The Redacted Woolsey Report states that the VCFD investigation team determined that electrical equipment owned and operated by SCE was the cause of the Woolsey Fire. Absent additional evidence, SCE believes that it is likely that its equipment was associated with the ignition of the Woolsey Fire. SCE expects to obtain and review additional information and materials in the possession of CAL FIRE and others during the course of its internal review and the Woolsey Fire litigation process, including SCE equipment that has been retained by CAL FIRE. Litigation Multiple lawsuits related to the 2017/2018 Wildfire/Mudslide Events naming SCE as a defendant have been filed by three categories of plaintiffs: individual plaintiffs, subrogation plaintiffs and public entity plaintiffs. A number of the lawsuits also name Edison International as a defendant and some of the lawsuits were filed as purported class actions. Because potential plaintiffs can still timely file claims related to the 2017/2018 Wildfire/Mudslide Events, SCE expects to be the subject of additional lawsuits related to the events. The litigation could take a number of years to be resolved because of the complexity of the matters and number of plaintiffs. As of February 18, 2021, SCE was aware of at least 295 lawsuits, representing approximately 4,000 plaintiffs, related to the Thomas and Koenigstein Fires naming SCE as a defendant. One hundred fifty of the 295 lawsuits also name Edison International as a defendant based on its ownership and alleged control of SCE. At least four of the lawsuits were filed as purported class actions. The lawsuits, which have been filed in the superior courts of Ventura, Santa Barbara and Los Angeles Counties allege, among other things, negligence, inverse condemnation, trespass, private nuisance, and violations of the public utilities and health and safety codes. An initial trial for a limited number of plaintiffs, sometimes referred to as a bellwether trial, on certain fire only matters is currently scheduled for July 19, 2021. The bellwether trial date may be further delayed to provide SCE and certain of the individual plaintiffs in the Thomas and Koenigstein Fire litigation the opportunity to pursue settlements of claims under a program adopted to promote an efficient and orderly settlement process. Seventy-two of the 295 lawsuits mentioned in the paragraph above allege that SCE has responsibility for the Thomas and/or Koenigstein Fires and that the Thomas and/or Koenigstein Fires proximately caused the Montecito Mudslides, resulting in the plaintiffs' claimed damages. Forty of the 72 Montecito Mudslides lawsuits also name Edison International as a defendant based on its ownership and alleged control of SCE. In addition to other causes of action, some of the Montecito Mudslides lawsuits also allege personal injury and wrongful death. A bellwether jury trial previously scheduled for October 12, 2020 was vacated due to the wide-spread disruption being caused by the COVID-19 pandemic. As of February 18, 2021, SCE was aware of at least 301 lawsuits, representing approximately 6,000 plaintiffs, related to the Woolsey Fire naming SCE as a defendant. Two hundred forty-three of the 301 lawsuits also name Edison International as a defendant based on its ownership and alleged control of SCE. At least two of the lawsuits were filed as purported class actions. The lawsuits, which have been filed in the superior courts of Ventura and Los Angeles Counties allege, among other things, negligence, inverse condemnation, personal injury, wrongful death, trespass, private nuisance, and violations of the public utilities and health and safety codes. A bellwether jury trial is currently scheduled for June 1, 2021. The Thomas and Koenigstein Fires and Montecito Mudslides lawsuits are being coordinated in the Los Angeles Superior Court. The Woolsey Fire lawsuits have also been coordinated in the Los Angeles Superior Court. On October 4, 2018, the Superior Court denied Edison International's and SCE's challenge to the application of inverse condemnation to SCE with respect to the Thomas and Koenigstein Fires and, on February 26, 2019, the California Supreme Court denied SCE's petition to review the Superior Court's decision. In January 2019, SCE filed a cross-complaint against certain local public entities alleging that failures by these entities, such as failure to adequately plan for flood hazards and build and maintain adequate debris basins, roads, bridges and other channel crossings, among other things, caused, contributed to or exacerbated the losses that resulted from the Montecito Mudslides. These cross-claims in the Montecito Mudslides litigation were not released as part of the Local Public Entity Settlements (as defined below). Additionally, in September 2018, a derivative lawsuit for breach of fiduciary duties and unjust enrichment was filed in the Los Angeles Superior Court against certain current and former members of the Boards of Directors of Edison International and SCE. Edison International and SCE are identified as nominal defendants in the action. The derivative lawsuit generally alleges that the individual defendants violated their fiduciary duties by causing or allowing SCE to operate in an unsafe manner in violation of relevant regulations, resulting in substantial liability and damage from the Thomas and Koenigstein Fires and the Montecito Mudslides. The lawsuit is currently stayed. In November 2018, a purported class action lawsuit alleging securities fraud and related claims was filed in federal court against Edison International, SCE and certain current and former officers of Edison International and SCE. The plaintiff alleges that Edison International and SCE made false and/or misleading statements in filings with the Securities and Exchange Commission by failing to disclose that SCE had allegedly failed to maintain its electric transmission and distribution networks in compliance with safety regulations, and that those alleged safety violations led to fires that occurred in 2017 and 2018, including the Thomas Fire and the Woolsey Fire. In January 2019, two separate derivative lawsuits alleging breach of fiduciary duties, securities fraud, misleading proxy statements, unjust enrichment, and related claims were filed in federal court against certain current and former members of the Boards of Directors and certain current and former officers of Edison International and SCE. Edison International and SCE are named as nominal defendants in those actions. The derivative lawsuits generally allege that the individual defendants breached their fiduciary duties and made misleading statements or allowed misleading statements to be made (i) between March 21, 2014 and August 10, 2015, with respect to certain ex parte communications between SCE and CPUC decision-makers concerning the settlement of the San Onofre Order Instituting Investigation proceeding (the "San Onofre OII") and (ii) from February 23, 2016 to the present, concerning compliance with applicable laws and regulations concerning electric system maintenance and operations related to wildfire risks. The lawsuits generally allege that these breaches of duty and misstatements led to substantial liability and damage resulting from the disclosure of SCE's ex parte communications in connection with the San Onofre OII settlement, and from the 2017/2018 Wildfire/Mudslide Events. The lawsuits are currently stayed. Settlements In the fourth quarter of 2019, SCE paid $360 million to a number of local public entities to resolve those parties' collective claims arising from the 2017/2018 Wildfire/Mudslide Events (the "Local Public Entity Settlements"). In the third quarter of 2020, Edison International and SCE entered into an agreement (the "TKM Subrogation Settlement") under which all of the insurance subrogation plaintiffs' in the Thomas Fire, Koenigstein Fire and Montecito Mudslides litigation (the "TKM Subrogation Plaintiffs") collective claims arising from the Thomas Fire, Koenigstein Fire or Montecito Mudslides have been resolved. Under the TKM Subrogation Settlement, SCE paid the TKM Subrogation Plaintiffs an aggregate of $1.2 billion in October 2020 and also agreed to pay $0.555 for each dollar in claims to be paid by the TKM Subrogation Plaintiffs to their policy holders on or before July 15, 2023, up to an agreed upon cap. In January 2021, Edison International and SCE entered into an agreement (the "Woolsey Subrogation Settlement") under which all of the insurance subrogation plaintiffs' in the Woolsey Fire litigation (the "Woolsey Subrogation Plaintiffs") collective claims arising from the Woolsey Fire have been resolved. Under the Woolsey Subrogation Settlement, SCE agreed to pay the Woolsey Subrogation Plaintiffs an aggregate of $2.2 billion by April 22, 2021. SCE has also agreed to pay $0.67 for each dollar in claims to be paid by the Woolsey Subrogation Plaintiffs to their policy holders on or before July 15, 2023, up to an agreed upon cap. SCE has

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	Leases Leases as Lessee SCE enters into various agreements to purchase power, electric capacity and other energy products that may be accounted for as leases when SCE has dispatch rights that determine when and how a plant runs. SCE also leases property and equipment primarily related to vehicles, office space and other equipment. The terms of the contracts included in the table below are primarily 3 to 20 years for PPA leases, 5 to 72 years for office leases, and 5 to 13 years for the remaining other operating leases. The following table summarizes SCE's lease payments for operating and finance leases as of December 31, 2020: (in millions) PPA Operating Leases 1 Other Operating Leases 2 PPA Finance Leases 1 2021 $ 204 $ 39 $ 1 2022 208 32 1 2023 159 26 1 2024 47 21 — 2025 47 18 — Thereafter 443 104 5 Total lease payments 1,108 240 8 Amount representing interest 3 203 60 4 Lease liabilities $ 905 $ 180 $ 4 1 Excludes expected purchases from most renewable energy contracts, which do not meet the definition of a lease payment since renewable power generation is contingent on external factors. 2 Excludes escalation clauses based on consumer price or other indices and residual value guarantees that are not considered probable at the commencement date of the lease. 3 Lease payments are discounted to their present value using SCE's incremental borrowing rates. Supplemental balance sheet information related to SCE's leases was as follows: (in millions) December 31, 2020 December 31, 2019 Operating leases: Operating lease ROU assets 1 $ 1,085 $ 689 Current portion of operating lease liabilities 214 79 Operating lease liabilities 871 610 Total operating lease liabilities 1 $ 1,085 $ 689 Finance leases included in: Utility property, plant and equipment, gross $ 4 $ 14 Accumulated depreciation — (5) Utility property, plant and equipment, net 4 9 Other current liabilities — 1 Other long-term liabilities 4 8 Total finance lease liabilities $ 4 $ 9 1 During the year ended 2020, a PPA operating lease commenced and one PPA was amended resulting in a total of $463 million additions in ROU assets and lease liabilities. The timing of SCE's recognition of the lease expense conforms to ratemaking treatment for SCE's recovery of the cost of electricity and is included in purchased power for operating leases and interest and amortization expense for finance leases. The following table summarizes the components of SCE's lease expense: (in millions) Year ended December 31, 2020 Year ended December 31, 2019 PPA leases: Operating lease cost $ 111 $ 118 Finance lease cost 1 1 Variable lease cost 1 1,917 2,087 Total PPA lease cost 2,029 2,206 Other operating leases cost 47 46 Total lease cost $ 2,076 $ 2,252 1 Includes lease costs from renewable energy contracts where payments are based on contingent external factors such as wind, hydro and solar power generation. Other information related to leases was as follows: (in millions, except lease term and discount rate) Year ended December 31, 2020 Year ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases PPA leases $ 111 $ 118 Other leases 44 44 Financing cash flows from PPA finance leases 1 1 ROU assets obtained in exchange for lease obligations: PPA operating leases $ 463 — Other operating leases 58 34 Weighted average remaining lease term (in years): Operating leases PPA leases 9.75 16.05 Other leases 12.13 12.73 PPA Finance leases 16.67 11.51 Weighted average discount rate: Operating leases PPA leases 3.12 % 4.46 % Other leases 3.63 % 3.88 % PPA Finance leases 11.29 % 8.76 % Leases as Lessor SCE also enters into operating leases to rent certain land and facilities as a lessor. These leases primarily have terms that range from 15 to 65 years. During the twelve months ended December 31, 2020 and December 31, 2019, SCE recognized $17 million and $18 million, respectively, in lease income, which is included in operating revenue on the consolidated statements of income. At December 31, 2020, the undiscounted cash flow expected to be received from lease payments for the remaining years is as follows: (in millions) 2021 $ 11 2022 10 2023 8 2024 7 2025 6 Thereafter 128 Total $ 170 EME, a wholly-owned subsidiary of Edison International, emerged from bankruptcy in 2014 and retained a lease investment in a hydroelectric power plant in Vidalia, Louisiana. In November 2020, the lessee exercised an option in the lease agreement and purchased the asset upon expiration of the lease term. Edison International recognized the net proceeds of $132 million as a pre-tax gain and has no remaining investment balance as of December 31, 2020 related to the lease investment. The revenue recognized for the lease in 2020 is immaterial to Edison International's consolidated financial statements.
Leases	Leases Leases as Lessee SCE enters into various agreements to purchase power, electric capacity and other energy products that may be accounted for as leases when SCE has dispatch rights that determine when and how a plant runs. SCE also leases property and equipment primarily related to vehicles, office space and other equipment. The terms of the contracts included in the table below are primarily 3 to 20 years for PPA leases, 5 to 72 years for office leases, and 5 to 13 years for the remaining other operating leases. The following table summarizes SCE's lease payments for operating and finance leases as of December 31, 2020: (in millions) PPA Operating Leases 1 Other Operating Leases 2 PPA Finance Leases 1 2021 $ 204 $ 39 $ 1 2022 208 32 1 2023 159 26 1 2024 47 21 — 2025 47 18 — Thereafter 443 104 5 Total lease payments 1,108 240 8 Amount representing interest 3 203 60 4 Lease liabilities $ 905 $ 180 $ 4 1 Excludes expected purchases from most renewable energy contracts, which do not meet the definition of a lease payment since renewable power generation is contingent on external factors. 2 Excludes escalation clauses based on consumer price or other indices and residual value guarantees that are not considered probable at the commencement date of the lease. 3 Lease payments are discounted to their present value using SCE's incremental borrowing rates. Supplemental balance sheet information related to SCE's leases was as follows: (in millions) December 31, 2020 December 31, 2019 Operating leases: Operating lease ROU assets 1 $ 1,085 $ 689 Current portion of operating lease liabilities 214 79 Operating lease liabilities 871 610 Total operating lease liabilities 1 $ 1,085 $ 689 Finance leases included in: Utility property, plant and equipment, gross $ 4 $ 14 Accumulated depreciation — (5) Utility property, plant and equipment, net 4 9 Other current liabilities — 1 Other long-term liabilities 4 8 Total finance lease liabilities $ 4 $ 9 1 During the year ended 2020, a PPA operating lease commenced and one PPA was amended resulting in a total of $463 million additions in ROU assets and lease liabilities. The timing of SCE's recognition of the lease expense conforms to ratemaking treatment for SCE's recovery of the cost of electricity and is included in purchased power for operating leases and interest and amortization expense for finance leases. The following table summarizes the components of SCE's lease expense: (in millions) Year ended December 31, 2020 Year ended December 31, 2019 PPA leases: Operating lease cost $ 111 $ 118 Finance lease cost 1 1 Variable lease cost 1 1,917 2,087 Total PPA lease cost 2,029 2,206 Other operating leases cost 47 46 Total lease cost $ 2,076 $ 2,252 1 Includes lease costs from renewable energy contracts where payments are based on contingent external factors such as wind, hydro and solar power generation. Other information related to leases was as follows: (in millions, except lease term and discount rate) Year ended December 31, 2020 Year ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases PPA leases $ 111 $ 118 Other leases 44 44 Financing cash flows from PPA finance leases 1 1 ROU assets obtained in exchange for lease obligations: PPA operating leases $ 463 — Other operating leases 58 34 Weighted average remaining lease term (in years): Operating leases PPA leases 9.75 16.05 Other leases 12.13 12.73 PPA Finance leases 16.67 11.51 Weighted average discount rate: Operating leases PPA leases 3.12 % 4.46 % Other leases 3.63 % 3.88 % PPA Finance leases 11.29 % 8.76 % Leases as Lessor SCE also enters into operating leases to rent certain land and facilities as a lessor. These leases primarily have terms that range from 15 to 65 years. During the twelve months ended December 31, 2020 and December 31, 2019, SCE recognized $17 million and $18 million, respectively, in lease income, which is included in operating revenue on the consolidated statements of income. At December 31, 2020, the undiscounted cash flow expected to be received from lease payments for the remaining years is as follows: (in millions) 2021 $ 11 2022 10 2023 8 2024 7 2025 6 Thereafter 128 Total $ 170 EME, a wholly-owned subsidiary of Edison International, emerged from bankruptcy in 2014 and retained a lease investment in a hydroelectric power plant in Vidalia, Louisiana. In November 2020, the lessee exercised an option in the lease agreement and purchased the asset upon expiration of the lease term. Edison International recognized the net proceeds of $132 million as a pre-tax gain and has no remaining investment balance as of December 31, 2020 related to the lease investment. The revenue recognized for the lease in 2020 is immaterial to Edison International's consolidated financial statements.

Equity

Equity	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Equity	Equity Common Stock Issuances In May 2020, Edison International issued 14,181,882 shares of common stock in a registered direct offering and received approximately $800 million in proceeds, before deducting fees and offering expenses of $14 million. The proceeds were used to pay off debt outstanding under a term loan agreement and for general corporate purposes. Refer to Note 5 for details of the term loan. In May 2019, Edison International filed a prospectus supplement and executed several distribution agreements with certain sales agents to establish an "at-the-market" ("ATM") program under which it may sell shares of its common stock having an aggregate sales price of up to $1.5 billion. During the three months ended December 31, 2020, Edison International did not issue any shares through the ATM program. During the twelve months ended December 31, 2020, Edison International issued 391,501 shares through the ATM program and received proceeds of $27 million, net of fees and offering expenses of $0.3 million. During the three and twelve months ended December 31, 2019, Edison International issued 2,824,261 shares through the ATM program and received proceeds of $198 million, net of fees and offering expenses of $2 million. The proceeds from the sales were used for equity contributions to SCE and for general corporate and working capital purposes. As of December 31, 2020, shares of common stock having an aggregate offering price of $1.3 billion remained available to be sold under the ATM program. Edison International has no obligation to sell the remaining available shares. Edison International continued to settle its ongoing common stock requirements of various internal programs through issuance of new common stock. During the twelve months ended December 31, 2020, 1,644,500 shares of common stock were purchased by employees through the 401(k) defined contribution savings plan for net cash receipts of $99 million, 387,425 shares of common stock were issued as stock compensation awards for net cash receipts of $16 million, 280,707 shares of new common stock were issued in lieu of distributing $17 million to shareholders opting to receive dividend payments in the form of additional common stock and 35,999 shares of common stock related to optional cash investments of $2 million. During the twelve months ended December 31, 2019, 595,200 shares of common stock were purchased by employees through the 401(k) defined contribution savings plan for net cash receipts of $41 million, 423,569 shares of common stock were issued as stock compensation awards for net cash receipts of $22 million and 125,481 shares of new common stock were issued in lieu of distributing $8 million to shareholders opting to receive dividend payments in the form of additional common stock. Edison International did not have optional cash investment issuances in December 31, 2019. Equity Contributions In 2020, Edison International Parent made the following equity contributions to SCE: Date of contribution Amounts (in millions) February 28, 2020 $ 269 April 29, 2020 200 May 26, 2020 319 June 30, 2020 100 August 31, 2020 219 December 18, 2020 325 Total $ 1,432 The proceeds from the Edison International Parent equity contributions in 2020 were used to support SCE's capital program, maintain the equity portion of SCE's capital structure at authorized levels and for general corporate purposes. Preferred and Preference Stock of Utility SCE's authorized shares are: $100 cumulative preferred – 12 million shares, $25 cumulative preferred – 24 million shares and preference with no par value – 50 million shares. There are no dividends in arrears for the preferred or preference shares. During the third quarter of 2020, SCE redeemed $120 million of cumulative preferred stock consisting of all of the outstanding shares of the 4.32% Series, 4.08% Series, 4.24% Series and the 4.78% Series at a price of $28.75, $25.50, $25.80 and $25.80, respectively. SCE recorded a $9 million loss on the redemption of the preferred stock as an adjustment to net income available to common stockholders. No preferred shares were issued or redeemed in the years ended December 31, 2019 and 2018. There is no sinking fund requirement for redemptions or repurchases of preferred shares. Shares of SCE's preference stock rank senior to all common stock. Shares of SCE's preference stock are not convertible into shares of any other class or series of SCE's capital stock or any other security. SCE's outstanding preference shares are not subject to mandatory redemption and there is no sinking fund requirement for redemptions or repurchases of preference shares. Preferred stock and preference stock are: Shares Redemption Dividends Declared per Share December 31, (in millions, except shares and per share amounts) 2020 2019 Cumulative preferred stock $25 par value: 4.08% Series — $ 25.50 $ 0.757 $ — $ 16 4.24% Series — 25.80 0.786 — 30 4.32% Series — 28.75 0.801 — 41 4.78% Series — 25.80 0.886 — 33 Preference stock No par value: 6.25% Series E (cumulative) 350,000 1,000.00 62.500 350 350 5.10% Series G (cumulative) 88,004 2,500.00 127.500 220 400 5.75% Series H (cumulative) 110,004 2,500.00 143.750 275 275 5.375% Series J (cumulative) 130,004 2,500.00 134.375 325 325 5.45% Series K (cumulative) 120,004 2,500.00 136.250 300 300 5.00% Series L (cumulative) 190,004 2,500.00 125.000 475 475 SCE's preferred and preference stock 1,945 2,245 Less issuance costs (44) (52) Edison International's preferred and preference stock of utility $ 1,901 $ 2,193 Shares of Series E preference stock issued in 2012 may be redeemed at par, in whole or in part, on or after February 1, 2022. Shares of Series G, H, J, K and L preference stock, issued in 2013, 2014, 2015, 2016 and 2017, respectively, may be redeemed at par, in whole, but not in part, at any time prior to March 15, 2018, March 15, 2024, September 15, 2025, March 15, 2026 and June 26, 2022, respectively, if certain changes in tax or investment company law or interpretation (or applicable rating agency equity credit criteria for Series L only) occur and certain other conditions are satisfied. On or after March 15, 2018, March 15, 2024, September 15, 2025, March 15, 2026 and June 26, 2022, SCE may redeem the Series G, H, J, K and L shares, respectively, at par, in whole or in part. For shares of Series H, J and K preference stock, distributions will accrue and be payable at a floating rate from and including March 15, 2024, September 15, 2025 and March 15, 2026, respectively. Shares of Series G, H, J, K and L preference stock were issued to SCE Trust II, SCE Trust III, SCE Trust IV, SCE Trust V and SCE Trust VI, respectively, special purpose entities formed to issue trust securities as discussed in Note 3. During the third quarter of 2020, SCE redeemed $180 million of the outstanding shares of the Series G preference stock. SCE recorded a $6 million loss on the redemption of the preference stock as an adjustment to net income available to common stockholders. No preference shares were issued or redeemed in the years ended December 31, 2019 and 2018.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The changes in accumulated other comprehensive loss, net of tax, consist of: Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Beginning balance $ (69) $ (50) $ (39) $ (23) Pension and PBOP – net loss: Other comprehensive loss before reclassifications (8) (14) (7) (14) Reclassified from accumulated other comprehensive loss 1 8 5 5 3 Other 2 — (10) — (5) Change — (19) (2) (16) Ending balance $ (69) $ (69) $ (41) $ (39) 1 These items are included in the computation of net periodic pension and PBOP expenses. See Note 9 for additional information.

Other Income

Other Income	12 Months Ended
	Dec. 31, 2020
Other Income and Expenses [Abstract]
Other Income	Other Income Other income net of expenses is as follows: Years ended December 31, (in millions) 2020 2019 2018 SCE other income and (expenses): Equity allowance for funds used during construction $ 121 $ 101 $ 104 Increase in cash surrender value of life insurance policies and life insurance benefits 66 39 36 Interest income 20 37 24 Net periodic benefit income – non-service components 102 70 81 Civic, political and related activities and donations (42) (46) (44) Other (12) (6) (7) Total SCE other income 255 195 194 Other income of Edison International Parent and Other: Net periodic benefit costs – non-service components (2) (3) (2) Other (2) 1 5 Total Edison International other income $ 251 $ 193 $ 197

Supplemental Cash Flows Informa

Supplemental Cash Flows Information	12 Months Ended
	Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flows Information	Supplemental Cash Flows Information Supplemental cash flows information is: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Cash payments (receipts): Interest, net of amounts capitalized $ 836 $ 705 $ 595 $ 713 $ 615 $ 552 Income taxes, net (34) (85) (135) (50) (164) (57) Non-cash financing and investing activities: Dividends declared but not paid: Common stock 251 231 200 — 200 — Preferred and preference stock 11 12 12 11 12 12 SCE's accrued capital expenditures at December 31, 2020, 2019 and 2018 were $730 million, $643 million and $594 million, respectively. Accrued capital expenditures will be included as an investing activity in the consolidated statements of cash flows in the period paid.

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions Edison International and SCE provide and receive various services to and from its subsidiaries and affiliates. Services provided to Edison International by SCE are priced at fully loaded cost (i.e., direct cost of good or service and allocation of overhead cost). Specified administrative services performed by Edison International or SCE employees, such as payroll and employee benefit programs, are shared among all affiliates of Edison International. Costs are allocated based on one of the following formulas: percentage of time worked, equity in investment and advances, number of employees, or multi-factor (operating revenue, operating expenses, total assets and number of employees). Edison International allocates various corporate administrative and general costs to SCE and other subsidiaries using established allocation factors. For the years ended December 31, 2020, 2019 and 2018, SCE purchased wildfire liability insurance for premiums of $176 million, $260 million and $22 million respectively, from Edison Insurance Services, Inc. ("EIS"), a wholly-owned subsidiary of Edison International. EIS fully reinsured the exposure for these policies through the commercial reinsurance market, with reinsurance limits and premiums equal to those of the insurance purchased by SCE. The related-party transactions included in SCE's consolidated balance sheets for wildfire-related insurance purchased from EIS and related expected insurance recoveries were as follows: December 31, (in millions) 2020 2019 Current insurance receivable due from affiliate $ 268 $ — Long-term insurance receivables due from affiliate — 803 Prepaid insurance 1 56 10 1 Reflected in "Prepaid expenses" on SCE's consolidated balance sheets.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Edison International's quarterly financial data is as follows: 2020 (in millions, except per share amounts) Fourth Third Second First Operating revenue $ 3,157 $ 4,644 $ 2,987 $ 2,790 Operating income (loss) 794 (379) 500 302 Net income (loss) 552 (242) 348 213 Net income (loss) attributable to common shareholders 526 (288) 318 183 Basic earnings (loss) per share: $ 1.39 $ (0.76) $ 0.85 $ 0.50 Diluted earnings (loss) per share: $ 1.39 $ (0.76) $ 0.85 $ 0.50 Dividends declared per share 0.6625 0.6375 0.6375 0.6375 2019 (in millions, except per share amounts) Fourth Third Second First Operating revenue $ 2,970 $ 3,741 $ 2,812 $ 2,824 Operating income 287 636 500 352 Net income 173 502 422 308 Net income attributable to common shareholders 143 471 392 278 Basic earnings per share: $ 0.40 $ 1.36 $ 1.20 $ 0.85 Diluted earnings per share: $ 0.40 $ 1.35 $ 1.20 $ 0.85 Dividends declared per share 0.6375 0.6125 0.6125 0.6125 SCE's quarterly financial data is as follows: 2020 (in millions) Fourth Third Second First Operating revenue $ 3,151 $ 4,635 $ 2,980 $ 2,780 Operating income (loss) 678 (364) 548 316 Net income (loss) 500 (218) 411 249 Net income (loss) available for common stock 474 (264) 381 219 Common dividends declared 325 269 269 269 2019 (in millions) Fourth Third Second First Operating revenue $ 2,958 $ 3,732 $ 2,800 $ 2,816 Operating income 325 649 513 358 Net income 224 534 449 323 Net income available for common stock 194 503 419 293 Common dividends declared 200 200 — 200

Schedule I - Condensed Financia

Schedule I - Condensed Financial Information of Parent	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Schedule I - Condensed Financial Information of Parent	EDISON INTERNATIONAL SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT CONDENSED BALANCE SHEETS December 31, (in millions) 2020 2019 Assets: Cash and cash equivalents $ 3 $ 15 Other current assets 43 260 Total current assets 46 275 Investments in subsidiaries 17,706 16,530 Deferred income taxes 675 608 Other long-term assets 71 76 Total assets $ 18,498 $ 17,489 Liabilities and equity: Short-term debt $ 129 $ — Current portion of long-term debt — 400 Other current liabilities 636 481 Total current liabilities 765 881 Long-term debt 3,133 2,733 Other long-term liabilities 552 572 Total equity 14,048 13,303 Total liabilities and equity $ 18,498 $ 17,489 EDISON INTERNATIONAL SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT CONDENSED STATEMENTS OF INCOME For the Years Ended December 31, 2020, 2019 and 2018 (in millions) 2020 2019 2018 Interest income from affiliates $ 1 $ 5 $ — Operating, interest and other expenses 189 150 98 Loss before equity in earnings (loss) of subsidiaries (188) (145) (98) Equity in earnings (loss) of subsidiaries 851 1,385 (376) Income (loss) before income taxes 663 1,240 (474) Income tax benefit (76) (44) (17) Income (loss) from continuing operations 739 1,284 (457) Income from discontinued operations, net of tax — — 34 Net income (loss) $ 739 $ 1,284 $ (423) CONDENSED STATEMENTS OF COMPREHENSIVE INCOME For the Years Ended December 31, 2020, 2019 and 2018 (in millions) 2020 2019 2018 Net income (loss) $ 739 $ 1,284 $ (423) Other comprehensive loss, net of tax — (9) (7) Comprehensive income (loss) $ 739 $ 1,275 $ (430) EDISON INTERNATIONAL SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT CONDENSED STATEMENTS OF CASH FLOWS For the Years Ended December 31, 2020, 2019 and 2018 (in millions) 2020 2019 2018 Net cash provided by operating activities $ 1,171 $ 181 $ 785 Cash flows from financing activities: Long-term debt issued 400 1,399 549 Long-term debt issuance costs (3) (9) (4) Long-term debt repaid (400) — — Short-term debt issued 800 1,000 — Short-term debt repaid (800) (1,000) — Common stock issued 912 2,391 — Payable due to affiliates 135 5 13 Commercial paper and other short-term borrowing (repayments), net 129 (1) (1,141) Payments for stock-based compensation (3) (27) (24) Receipts for stock-based compensation 21 39 14 Dividends paid (928) (810) (788) Net cash provided by (used in) financing activities 263 2,987 (1,381) Capital contributions to affiliate (1,446) (3,258) (10) Dividends from affiliate — 8 179 Net cash (used in) provided by investing activities: (1,446) (3,250) 169 Net decrease in cash and cash equivalents (12) (82) (427) Cash and cash equivalents, beginning of year 15 97 524 Cash and cash equivalents, end of year $ 3 $ 15 $ 97 Note 1. Basis of Presentation The accompanying condensed financial statements of Edison International Parent should be read in conjunction with the consolidated financial statements and notes thereto of Edison International and subsidiaries ("Registrant") included in this Form 10-K. Edison International Parent's significant accounting policies are consistent with those of the Registrant, SCE and other wholly owned and controlled subsidiaries. Dividends Received Edison International Parent received cash dividends from SCE of $1.3 billion, $400 million and $788 million in 2020, 2019 and 2018, respectively. Dividend Restrictions CPUC holding company rules require that SCE's dividend policy be established by SCE's Board of Directors on the same basis as if SCE were a stand-alone utility company, and that the capital requirements of SCE, as deemed to be necessary to meet SCE's electricity service obligations, shall receive first priority from the Boards of Directors of both Edison International and SCE. In addition, the CPUC regulates SCE's capital structure which limits the dividends it may pay to its shareholders. Effective January 1, 2020, the common equity component of SCE's CPUC authorized capital structure was increased from 48% to 52% on a weighted average basis over the January 1, 2020 to December 31, 2022 compliance period. Under AB 1054, the impact of SCE's contributions to the Wildfire Insurance Fund are excluded from the measurement of SCE's CPUC-jurisdictional authorized capital structure. For further information, see "Notes to Consolidated Financial Statements—Note 12. Commitments and Contingencies." In May 2020, the CPUC issued a decision on SCE's application to the CPUC for waiver of compliance with its equity ratio requirement, that allows SCE to exclude from its equity ratio calculations (i) net charges accrued in connection with the 2017/2018 Wildfire/Mudslide Events and (ii) debt issued for the purpose of paying claims related to the 2017/2018 Wildfire/Mudslide Events up to an amount equal to the net charges accrued in connection with the 2017/2018 Wildfire/Mudslide Events. The temporary exclusion will lapse on May 7, 2022 or when a determination regarding cost recovery for the 2017/2018 Wildfire/Mudslide Events is made, whichever comes earlier. If the CPUC has not made a determination regarding cost recovery by May 7, 2022, SCE is permitted to file another application for a waiver of compliance with its equity ratio requirement. In the interim, SCE is required to notify the CPUC if an adverse financial event reduces SCE's spot equity ratio by more than one percent from the level most recently filed with the CPUC in the proceeding. The last spot equity ratio SCE filed with the CPUC in the proceeding did not exclude the then $1.8 billion net charge and was 45.2% as of December 31, 2018 (at the time the common equity component of SCE's CPUC authorized capital structure was required to remain at or above 48% on a weighted average basis over the applicable 37-month period). SCE's spot equity ratio on December 31, 2018 would have been 48.7% had the $1.8 billion net charge at December 31, 2018 been excluded, therefore SCE will notify the CPUC if its spot ratio drops below 47.7% in any quarter. See "Notes to Consolidated Financial Statements—Note 1. Summary of Significant Accounting Policies—SCE Dividends." Note 2. Debt and Equity Financing Long-Term Debt In April 2020, Edison International Parent issued $400 million of 4.95% senior notes due 2025. The proceeds were used to repay all $400 million of Edison International Parent's outstanding 2.125% Senior Notes due in 2020. In addition, at December 31, 2020, Edison International Parent had $400 million of 2.40% senior notes due in 2022, $300 million of 3.125% senior notes due 2022, $400 million of 2.95% senior notes due in 2023, $500 million of 3.55% senior notes due 2024, $600 million of 5.75% senior notes due in 2027 and $550 million of 4.125% senior notes due in 2028. At December 31, 2019, Edison International Parent had $400 million of 2.125% senior notes due in 2020, $400 million of 2.40% senior notes due in 2022, $400 million of 2.95% senior notes due in 2023 and $550 million of 4.125% senior notes due in 2028. Credit Agreements and Short-Term Debt The following table summarizes the status of the credit facility at December 31, 2020: (in millions) Commitment $ 1,500 Outstanding borrowings 1 130 Amount available $ 1,370 1 At December 31, 2020 Edison International Parent had $130 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.42%. At December 31, 2019 Edison International Parent did not have any outstanding commercial paper. In March 2020, Edison International Parent borrowed $800 million under a term loan agreement due in March 2021 with a variable interest rate based on LIBOR plus 1.125%. The proceeds were used for general corporate purposes. In May 2020, Edison International repaid the outstanding balance of the term loan using the proceeds from issuance of common stock in a registered direct offering. The debt covenant in Edison International Parent's credit facility requires a consolidated debt to total capitalization ratio of less than or equal to 0.70 to 1. At December 31, 2020, Edison International's consolidated debt to total capitalization ratio was 0.59 to 1. Equity In May 2020, Edison International issued 14,181,882 shares of common stock in a registered direct offering and received approximately $800 million in proceeds, before deducting fees and offering expenses of $14 million. The proceeds were used to pay off debt outstanding under a term loan agreement and for general corporate purposes. Refer to Note 2 for details of the term loan. In May 2019, Edison International filed a prospectus supplement and executed several distribution agreements with certain sales agents to establish an "at-the-market" ("ATM") program under which it may sell shares of its common stock having an aggregate sales price of up to $1.5 billion. During the three months ended December 31, 2020, Edison International did not issue any shares through the ATM program. During the twelve months ended December 31, 2020, Edison International issued 391,501 shares through the ATM program and received proceeds of $27 million, net of fees and offering expenses of $0.3 million. During the three and twelve months ended December 31, 2019, Edison International issued 2,824,261 shares through the ATM program and received proceeds of $198 million, net of fees and offering expenses of $2 million. The proceeds from the sales were used for equity contributions to SCE and for general corporate and working capital purposes. As of December 31, 2020, shares of common stock having an aggregate offering price of $1.3 billion remained available to be sold under the ATM program. Edison International has no obligation to sell the remaining available shares. Edison International continued to settle its ongoing common stock requirements of various internal programs through issuance of new common stock. During the twelve months ended December 31, 2020, 1,644,500 shares of common stock were purchased by employees through the 401(k) defined contribution savings plan for net cash receipts of $99 million, 387,425 shares of common stock were issued as stock compensation awards for net cash receipts of $16 million, 280,707 shares of new common stock were issued in lieu of distributing $17 million to shareholders opting to receive dividend payments in the form of additional common stock and 35,999 shares of common stock related to optional cash investments of $2 million. During the twelve months ended December 31, 2019, 595,200 shares of common stock were purchased by employees through the 401(k) defined contribution savings plan for net cash receipts of $41 million, 423,569 shares of common stock were issued as stock compensation awards for net cash receipts of $22 million and 125,481 shares of new common stock were issued in lieu of distributing $8 million to shareholders opting to receive dividend payments in the form of additional common stock. Edison International did not have optional cash investment issuances in December 31, 2019. Note 3. Related-Party Transactions Edison International's Parent expense from services provided by SCE was $2 million in 2020, $2 million in 2019 and $2 million in 2018. Edison International's Parent interest expense from loans due to affiliates was $4 million in 2020 and $5 million in 2019 and 2018. Edison International Parent had current related-party receivables of $43 million and $272 million and current related-party payables of $323 million and $198 million at December 31, 2020 and 2019, respectively. Edison International Parent had long-term related-party receivables of $68 million and $73 million at December 31, 2020 and 2019, respectively, and long-term related-party payables of $219 million and $213 million at December 31, 2020 and 2019, respectively. Edison Mission Energy ("EME"), a wholly-owned subsidiary of Edison International, emerged from bankruptcy in 2014 and retained a lease investment in a hydroelectric power plant in Vidalia, Louisiana. In November 2020, the lessee exercised an option in the lease agreement and purchased the asset upon expiration of the lease term. EME received net proceeds of $132 million from sale, which was transferred to Edison International Parent as a related-party note and included in current related-party payables. Note 4. Contingencies For a discussion of material contingencies see "Notes to Consolidated Financial Statements—Note 8. Income Taxes" and "—Note 12. Commitments and Contingencies."

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	EDISON INTERNATIONAL SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Additions (in millions) Balance at Charged to Charged to Deductions Balance at For the Year ended December 31, 2020 Allowance for uncollectible accounts Customers $ 35.8 $ 35.9 $ 120.0 c $ 16.3 $ 175.4 All others 13.9 9.4 — 10.8 12.5 Total allowance for uncollectible amounts $ 49.7 $ 45.3 $ 120.0 $ 27.1 a $ 187.9 Tax valuation allowance $ 35.0 $ — $ — $ — $ 35.0 For the Year ended December 31, 2019 Allowance for uncollectible accounts Customers $ 32.0 $ 22.2 $ — $ 18.4 $ 35.8 All others 19.5 10.0 — 15.6 13.9 Total allowance for uncollectible amounts $ 51.5 $ 32.2 $ — $ 34.0 a $ 49.7 Tax valuation allowance $ 36.0 $ — $ — $ 1.0 $ 35.0 For the Year ended December 31, 2018 Allowance for uncollectible accounts Customers $ 36.6 $ 19.0 $ — $ 23.6 $ 32.0 All others 17.3 16.2 — 14.0 19.5 Total allowance for uncollectible amounts $ 53.9 $ 35.2 $ — $ 37.6 a $ 51.5 Tax valuation allowance $ 28.0 $ — $ 8.0 b $ — $ 36.0 a Accounts written off, net. b During 2018, Edison International recorded an additional valuation allowance of $4 million for non-California state net operating loss carryforwards and $4 million for California capital losses generated from the April 2018 sale of SoCore Energy, which are estimated to expire before being utilized. c Amounts are deferred to regulatory assets. SOUTHERN CALIFORNIA EDISON COMPANY SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Additions (in millions) Balance at Charged to Charged to Deductions Balance at For the Year ended December 31, 2020 Allowance for uncollectible accounts Customers $ 35.5 $ 35.6 $ 120.0 b $ 15.9 $ 175.2 All others 13.9 9.4 — 10.8 12.5 Total allowance for uncollectible accounts $ 49.4 $ 45.0 $ 120.0 $ 26.7 a $ 187.7 For the Year ended December 31, 2019 Allowance for uncollectible accounts Customers $ 31.6 $ 22.0 $ — $ 18.1 $ 35.5 All others 19.5 10.0 — 15.6 13.9 Total allowance for uncollectible accounts $ 51.1 $ 32.0 $ — $ 33.7 a $ 49.4 For the Year ended December 31, 2018 Allowance for uncollectible accounts Customers $ 36.0 $ 18.9 $ — $ 23.3 $ 31.6 All others 17.3 16.2 — 14.0 19.5 Total allowance for uncollectible accounts $ 53.3 $ 35.1 $ — $ 37.3 a $ 51.1 a Accounts written off, net.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Edison International is the parent holding company of Southern California Edison Company ("SCE") and Edison Energy Group, Inc. ("Edison Energy Group"). SCE is an investor-owned public utility primarily engaged in the business of supplying and delivering electricity to an approximately 50,000 square mile area of southern California. Edison Energy Group is a holding company for Edison Energy, LLC ("Edison Energy") which is engaged in the competitive business of providing data-driven energy solutions to commercial, institutional and industrial customers. Edison Energy's business activities are currently not material to report as a separate business segment. These combined notes to the consolidated financial statements apply to both Edison International and SCE unless otherwise described. Edison International's consolidated financial statements include the accounts of Edison International, SCE and other wholly owned and controlled subsidiaries. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to "Edison International Parent and Other" refer to Edison International Parent and its competitive subsidiaries and "Edison International Parent" refer to Edison International on a stand-alone basis, not consolidated with its subsidiaries. SCE's consolidated financial statements include the accounts of SCE and its wholly owned and controlled subsidiaries. All intercompany transactions have been eliminated from the consolidated financial statements. Edison International's and SCE's accounting policies conform to accounting principles generally accepted in the United States of America, including the accounting principles for rate-regulated enterprises, which reflect the ratemaking policies of the California Public Utility Commission ("CPUC") and the Federal Energy Regulatory Commission ("FERC"). SCE applies authoritative guidance for rate-regulated enterprises to the portion of its operations in which regulators set rates at levels intended to recover the estimated costs of providing service, plus a return on net investments in assets, or rate base. Regulators may also impose certain penalties or grant certain incentives. Due to timing and other differences in the collection of electric utility revenue, these principles require an incurred cost that would otherwise be charged to expense by a non-regulated entity to be capitalized as a regulatory asset if it is probable that the cost is recoverable through future rates; and conversely the principles require recording of a regulatory liability for amounts collected in rates to recover costs expected to be incurred in the future or amounts collected in excess of costs incurred and refundable to customers. In addition, SCE recognizes revenue and regulatory assets from alternative revenue programs, which enables the utility to adjust future rates in response to past activities or completed events, if certain criteria are met, even for programs that do not qualify for recognition of "traditional" regulatory assets and liabilities. SCE assesses, at the end of each reporting period, whether regulatory assets are probable of future recovery. See Note 11 for composition of regulatory assets and liabilities.
Use of Estimates	The preparation of financial statements in conformity with United States generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported period. Actual results could differ from those estimates. Certain prior year amounts have been conformed to the current year's presentation, including the presentation of long-term insurance receivables on the consolidated balance sheets of Edison International and Southern California Edison, previously presented as other long-term assets.
Cash and Cash Equivalents	Cash equivalents include investments in money market funds. Generally, the carrying value of cash equivalents equals the fair value, as these investments have original maturities of three months or less.
Allowance for Uncollectible Accounts	Allowance for Uncollectible Accounts The allowance for uncollectible accounts is recorded based on SCE's estimate of expected credit losses and adjusted over the life of the receivables as needed. Since the customer base of SCE is concentrated in Southern California and exposes SCE to a homogeneous set of economic conditions, the allowance is measured on a collective basis on the historical amounts written-off, assessment of customer collectibility and current economic trends, including unemployment rates and any likelihood of recession for the region. At December 31, 2020, this included the estimated impacts of the COVID-19 pandemic.
Inventory	InventorySCE's inventory is primarily composed of materials, supplies and spare parts, and generally stated at weighted average cost.
Emission Allowances and Energy Credits	Emission Allowances and Energy CreditsSCE is allocated greenhouse gas ("GHG") allowances annually which it is then required to sell into quarterly auctions. GHG proceeds from the auctions are recorded as a regulatory liability to be refunded to customers. SCE purchases GHG allowances in quarterly auctions or from counterparties to satisfy its GHG emission compliance obligations and recovers such costs of GHG allowances from customers. GHG allowances held for use are classified as "Other current assets" on the consolidated balance sheets and are stated, similar to an inventory method, at the lower of weighted average cost or market.
Property, Plant and Equipment	Property, Plant and Equipment SCE plant additions, including eligible replacements and betterments, are capitalized. Direct material and labor and indirect costs such as construction overhead, administrative and general costs, pension and benefits, and property taxes are capitalized as part of plant additions. The CPUC authorizes a capitalization rate for each of the indirect costs which are allocated to each project based on either labor or total costs. Estimated useful lives authorized by the CPUC in the 2018 General Rate Case ("GRC") and weighted average useful lives of SCE's property, plant and equipment, are as follows: Estimated Useful Lives Weighted Average Useful Lives Generation plant 10 years to 55 years 36 years Distribution plant 20 years to 65 years 48 years Transmission plant 45 years to 65 years 54 years General plant and other 5 years to 60 years 25 years Depreciation of utility property, plant and equipment is computed on a straight-line, remaining-life basis. SCE's depreciation expense was $1.8 billion, $1.7 billion and $1.7 billion for 2020, 2019 and 2018, respectively. Depreciation expense stated as a percent of average original cost of depreciable utility plant was, on a composite basis, 3.6%, 3.6% and 3.7% for 2020, 2019 and 2018, respectively. The original costs of retired property are charged to accumulated depreciation. See Note 2 for further information. Nuclear fuel for the Palo Verde Nuclear Generating Station ("Palo Verde") is recorded as utility plant (nuclear fuel in the fabrication and installation phase is recorded as construction in progress) in accordance with CPUC ratemaking procedures. Palo Verde nuclear fuel is amortized using the units of production method. Allowance for funds used during construction ("AFUDC") represents the estimated cost of debt and equity funds that finance utility-plant construction and is capitalized during certain plant construction. AFUDC is recovered in rates through depreciation expense over the useful life of the related asset. AFUDC equity represents a method to compensate SCE for the estimated cost of equity used to finance utility plant additions and is recorded as part of construction in progress. AFUDC equity was $121 million, $101 million and $104 million in 2020, 2019 and 2018, respectively, and is reflected in "Other income." AFUDC debt was $53 million, $63 million and $44 million in 2020, 2019 and 2018, respectively and is reflected as a reduction of "Interest expense." Major Maintenance Major maintenance costs for SCE's power plant facilities and equipment are expensed as incurred.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Impairments of long-lived assets are evaluated based on a review of estimated future cash flows expected to be generated whenever events or changes in circumstances indicate that the carrying amount of such investments or assets may not be recoverable. If the carrying amount of a long-lived asset exceeds expected future cash flows, undiscounted and without interest charges, an impairment loss is recognized in the amount of the excess of fair value over the carrying amount. Fair value is determined via market, cost and income-based valuation techniques, as appropriate.
Prepaid Insurance	Initial and annual contributions to the wildfire insurance fund established pursuant to California Assembly Bill 1054 (the "Wildfire Insurance Fund" and "AB 1054") Edison International and SCE accounted for the contributions to the Wildfire Insurance Fund similarly to prepaid insurance. No period of coverage was provided in AB 1054, therefore expense is being allocated to periods ratably based on an estimated period of coverage. Edison International and SCE have a $2.4 billion and $2.8 billion long-term asset at December 31, 2020 and December 31, 2019, respectively, and a $323 million current asset reflected as "Wildfire Insurance Fund contributions" in the consolidated balance sheets for the initial $2.4 billion contribution made during the third quarter of 2019 and the present value of annual contributions SCE committed to make to the Wildfire Insurance Fund, reduced by amortization at both December 31, 2020 and December 31, 2019. A long-term liability of $703 million and $785 million have been reflected in "Other deferred credits and other long-term liabilities" for the present value of unpaid contribution amounts, at December 31, 2020 and December 31, 2019, respectively. Contributions were discounted to the present value at the date SCE committed to participate in the Wildfire Insurance Fund using US treasury interest rates. During 2020 a period of 10 years was used to amortize the asset. All expenses related to the contributions are being reflected in "Operation and maintenance" in the consolidated statements of income. Changes in the estimated period of coverage provided by the Wildfire Insurance Fund could lead to material changes in future expense recognition. In estimating the period of coverage Edison International and SCE used Monte Carlo simulations based on five years (2014 – 2018) of historical data from wildfires caused by electrical utility equipment to estimate expected losses. The details of the operation of the Wildfire Insurance Fund and estimates related to claims by SCE, Pacific Gas & Electric Company ("PG&E") and San Diego Gas & Electric ("SDG&E") against the fund have been applied to the expected loss simulations to estimate the period of coverage of the fund. The most sensitive inputs to the estimated period of coverage are the expected frequency of wildfire events caused by investor-owned utility electrical equipment and the estimated costs associated with those forecasted events. Edison International and SCE evaluate all inputs annually, or upon claims being made from the fund for catastrophic wildfires, and the expected life of the insurance fund will be adjusted as required. Based on information available in the first quarter of 2021 regarding catastrophic wildfires during 2019 and 2020, SCE reassessed its estimate of the life of the Wildfire Insurance Fund. Using 7 years of historical data (2014 – 2020) of wildfires caused by electrical utility equipment to create Monte Carlo simulations of expected loss, resulted in the expected life of the Wildfire Insurance Fund increasing from 10 years to 15 years from the date SCE committed to participate in the Wildfire Insurance Fund. Edison International and SCE will assess the Wildfire Insurance Fund contribution assets for impairment in the event that a participating utility's electrical equipment is found to be the substantial cause of a catastrophic wildfire, based on the ability of SCE to benefit from the coverage provided by the Wildfire Insurance Fund in an amount equal to the recorded assets.
Goodwill	Goodwill Edison International assesses goodwill through an annual goodwill impairment test, at the reporting unit level as of October 1 of each year. Edison International updates its goodwill impairment test between annual tests if events occur or circumstances change such that it is more likely than not that the fair value of a reporting unit is below its carrying value.
Nuclear Decommissioning and Asset Retirement Obligations	Nuclear Decommissioning and Asset Retirement Obligations The fair value of a liability for an asset retirement obligation ("ARO") is recorded in the period in which it is incurred, including a liability for the fair value of a conditional ARO, if the fair value can be reasonably estimated even though uncertainty exists about the timing and/or method of settlement. When an ARO liability is initially recorded, SCE capitalizes the cost by increasing the carrying amount of the related long-lived asset. For each subsequent period, the liability is increased for accretion expense and the capitalized cost is depreciated over the useful life of the related asset. SCE has not recorded an ARO for assets that are expected to operate indefinitely or where SCE cannot estimate a settlement date (or range of potential settlement dates). As such, ARO liabilities are not recorded for certain retirement activities, including certain hydroelectric facilities. The following table summarizes the changes in SCE's ARO liability: December 31, (in millions) 2020 2019 Beginning balance $ 3,029 $ 3,031 Accretion 1 160 166 Revisions (36) 4 Liabilities settled (223) (172) Ending balance $ 2,930 $ 3,029 1 An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting. AROs related to decommissioning of SCE's nuclear power facilities are based on site-specific studies conducted as part of each Nuclear Decommissioning Cost Triennial Proceeding ("NDCTP") conducted before the CPUC. Revisions of an ARO are established for updated site-specific decommissioning cost estimates. The ARO for decommissioning SCE's San Onofre Nuclear Generating Station ("San Onofre") and Palo Verde nuclear power facilities is $2.6 billion as of December 31, 2020. The liability to decommission SCE's nuclear power facilities is based on a 2017 decommissioning study that was filed as part of the 2018 NDCTP for San Onofre Units 1, 2 and 3, and a 2019 decommissioning study for Palo Verde. SCE revised the ARO for Palo Verde in 2020 and for San Onofre Units 1, 2 and 3 in 2018 to reflect updated decommissioning cost estimates. SCE records an ARO regulatory liability as a result of timing differences between the recognition of costs and the recovery of costs through the ratemaking process. For further information, see Note 11. Decommissioning of San Onofre Unit 1 began in 1999 and the transfer of spent nuclear fuel from Unit 1 to dry cask storage in the Independent Spent Fuel Storage Installation ("ISFSI") was completed in 2005. Major decommissioning work for Unit 1 has been completed except for certain underground work. Decommissioning of San Onofre Units 2 and 3 began in June 2013 and the spent nuclear fuel transfer from San Onofre Units 2 and 3 to dry cask storage in the ISFSI was completed in August 2020. In October 2019, the California Coastal Commission approved SCE's application for the Coastal Development Permit, the principal discretionary permit required to start major decommissioning activities at San Onofre. In August 2020, SCE commenced major decommissioning activities at San Onofre in accordance with the terms of the permit. Decommissioning costs, which are recovered through customer rates over the term of each nuclear facility's operating license, are recorded as a component of depreciation expense, with a corresponding credit to the ARO regulatory liability. Due to regulatory recovery of SCE's nuclear decommissioning expense, prudently incurred costs for nuclear decommissioning activities do not affect SCE's earnings. Amortization of the ARO asset (included within the unamortized nuclear investment) and accretion of the ARO liability are deferred as decreases to the ARO regulatory liability account, resulting in no impact on earnings. SCE has collected in rates amounts for the future decommissioning of its nuclear assets and has placed those amounts in independent trusts. Amounts collected in rates in excess of the ARO liability are classified as regulatory liabilities. Changes in the estimated costs, timing of decommissioning or the assumptions underlying these estimates could cause material revisions to the estimated total cost to decommission. SCE currently estimates that it will spend approximately $6.6 billion through 2079 to decommission its nuclear facilities. This estimate is based on SCE's decommissioning cost methodology used for ratemaking purposes, escalated at rates ranging from 0.6% to 7.5% (depending on the cost element) annually. These costs are expected to be funded from independent decommissioning trusts. SCE estimates annual after-tax earnings on the decommissioning funds of 1.3% to 4.1% dependent on asset class. If the assumed return on trust assets is not earned or costs escalate at higher rates, SCE expects that additional funds needed for decommissioning will be recoverable through future rates, subject to a reasonableness review. See Note 10 for further information. Due to regulatory recovery of SCE's nuclear decommissioning expense, prudently incurred costs for nuclear decommissioning activities do not affect SCE's earnings. SCE's nuclear decommissioning costs are subject to CPUC review through the triennial regulatory proceeding. SCE's nuclear decommissioning trust investments primarily consist of fixed income investments that are classified as available-for-sale and equity investments. Due to regulatory mechanisms, investment earnings and realized gains and losses have no impact on earnings. Unrealized gains and losses on decommissioning trust funds, including impairment, increase or decrease the trust assets and the related regulatory asset or liability and have no impact on electric utility revenue or decommissioning expense. SCE reviews each fixed income security for impairment on the last day of each month. If the fair value on the last day of the month is less than the amortized cost for that security, SCE impairs the disclosed amortized cost. If the fair value is greater or less than the carrying value for that security at the time of sale, SCE recognizes a related realized gain or loss, respectively.
Deferred Financing Costs	Deferred Financing CostsDebt premium, discount and issuance expenses incurred in connection with obtaining financing are deferred and amortized on a straight-line basis. Under CPUC ratemaking procedures, SCE's debt reacquisition expenses are amortized over the remaining life of the reacquired debt or, if refinanced, the life of the new debt.
Revenue Recognition	Revenue Recognition Revenue is recognized by Edison International and SCE when a performance obligation to transfer control of the promised goods is satisfied or when services are rendered to customers. This typically occurs when electricity is delivered to customers, which includes amounts for services rendered but unbilled at the end of a reporting period. SCE's Revenue from Contracts with Customers Provision of Electricity SCE principally generates revenue through supplying and delivering electricity to its customers. Rates charged to customers are based on tariff rates, approved by the CPUC and FERC. Starting with SCE's 2021 GRC, revenue will be authorized through quadrennial GRC proceedings, which are intended to provide SCE a reasonable opportunity to recover its costs and earn a return on its CPUC-jurisdictional rate base. The CPUC sets an annual revenue requirement for the base year and the remaining three years are set by a methodology established in the GRC proceeding. Revenue was previously authorized by the CPUC in triennial GRC proceedings. As described above, SCE also earns revenue, with no return, to recover costs for power procurement and other activities. Revenue is authorized by the FERC through a formula rate which is intended to provide SCE a reasonable opportunity to recover transmission capital and operating costs that are prudently incurred, including a return on its FERC-jurisdictional rate base. Under the operation of the formula rate, transmission revenue is updated to actual cost of service annually. For SCE's electricity sales for both residential and non-residential customers, SCE satisfies the performance obligation of delivering electricity over time as the customers simultaneously receive and consume the delivered electricity. Energy sales are typically on a month-to-month implied contract for transmission, distribution and generation services. Revenue is recognized over time as the energy is supplied and delivered to customers and the respective revenue is billed and paid on a monthly basis. CPUC and FERC rates decouple authorized revenue from the volume of electricity sales and the price of energy procured so that SCE receives revenue equal to amounts authorized by the relevant regulatory agencies. As a result, the volume of electricity sold to customers and specific customer classes does not have a direct impact on SCE's financial results. See Note 7 for further information on SCE's revenue. Sales and Use Taxes SCE bills certain sales and use taxes levied by state or local governments to its customers. Included in these sales and use taxes are franchise fees, which SCE pays to various municipalities (based on contracts with these municipalities) in order to operate within the limits of the municipality. SCE bills these franchise fees to its customers based on a CPUC-authorized rate. These franchise fees, which are required to be paid regardless of SCE's ability to collect from the customer, are accounted for on a gross basis. SCE's franchise fees billed to customers were $131 million, $122 million and $133 million for the years ended December 31, 2020, 2019 and 2018, respectively. When SCE acts as an agent for sales and use tax, the taxes are accounted for on a net basis. Amounts billed to and collected from customers for these taxes are remitted to the taxing authorities and are not recognized as electric utility revenue. SCE's Alternative Revenue Programs
Power Purchase Agreements	Power Purchase Agreements SCE enters into power purchase agreements ("PPAs") in the normal course of business. A power purchase agreement may be considered a variable interest in a variable interest entity ("VIE"). If SCE is the primary beneficiary in the VIE, SCE should consolidate the VIE. None of SCE's PPAs resulted in consolidation of a VIE at December 31, 2020 and 2019. See Note 3 for further discussion of PPAs that are considered variable interests. A PPA may also contain a lease for accounting purposes. See "Leases" below and Note 12 and Note 13 for further discussion of SCE's PPAs, including agreements that are classified as operating and finance leases for accounting purposes. A PPA that does not contain a lease may be classified as a derivative which is recorded at fair value on the consolidated balance sheets. These PPAs may be eligible for an election to designate as a normal purchase and sale, which is accounted for on an accrual basis as an executory contract. See Note 6 for further information on derivative instruments. PPAs that do not meet the above classifications are accounted for on an accrual basis.
Derivatives Instruments	Derivative Instruments SCE records derivative instruments on its consolidated balance sheets as either assets or liabilities measured at fair value unless otherwise exempted from derivative treatment as normal purchases or sales. The normal purchases and sales exception requires, among other things, physical delivery in quantities expected to be used or sold over a reasonable period in the normal course of business. Realized gains and losses from SCE's derivative instruments are expected to be recovered from or refunded to customers through regulatory mechanisms and, therefore, SCE's fair value changes have no impact on purchased power expense or earnings. SCE does not use hedge accounting for derivative transactions due to regulatory accounting treatment. Where SCE's derivative instruments are subject to a master netting agreement and certain criteria are met, SCE presents its derivative assets and liabilities on a net basis on its consolidated balance sheets. In addition, derivative positions are offset against margin and cash collateral deposits. The results of derivative activities are recorded as part of cash flows from operating activities on the consolidated statements of cash flows. See Note 6 for further information on derivative instruments.
Leases	Leases On January 1, 2019, Edison International and SCE adopted accounting standards updates that require lessees to recognize a lease on the balance sheet as a right-of-use ("ROU") asset and related lease liability and classify the lease as either operating or finance. A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified assets for a period of time in exchange for consideration. An entity controls the use when it has a right to obtain substantially all of the benefits from the use of the identified asset and has the right to direct the use of the asset. SCE determines if an arrangement is a lease at contract inception. SCE includes both the lease and non-lease components as a single component and accounts for them as a lease for all classes of underlying assets, except energy storage underlying assets which were first contracted in 2020 and for which each component will be separately accounted for. Lease liabilities are recognized based on the present value of the lease payments over the lease term at the commencement date. SCE calculates and uses the rate implicit in the lease if the information is readily available or if not available, SCE uses its incremental borrowing rate in determining the present value of lease payments. Incremental borrowing rates are comprised of underlying risk-free rates and secured credit spreads relative to first mortgage bonds with like tenors of lease term durations. Lease ROU assets are based on the liability, subject to adjustments, such as lease incentives. The ROU assets also include any lease payments made at or before the commencement date. SCE excludes variable lease payments in measuring lease assets and lease liabilities, other than those that depend on an index or a rate or are in substance fixed payments. SCE's lease terms include options to extend or terminate the lease when it is reasonably certain that such options will be exercised. Operating leases are included in "Operating lease right-of-use assets," "Current portion of operating lease liabilities" and "Operating lease liabilities" on the consolidated balance sheets. Finance leases are included in "Utility property, plant and equipment," "Other current liabilities" and "Other deferred credits and other long-term liabilities" on the consolidated balance sheets. SCE enters into power purchase agreements that may contain leases. This occurs when a power purchase agreement designates a specific power plant, SCE obtains substantially all of the economic benefits from the use of the plant and has the right to direct the use of the plant. SCE also enters into a number of agreements to lease property and equipment in the normal course of business, primarily related to vehicles, office space and other equipment. See Note 13 for further discussion of SCE's contracts that are classified as operating and finance leases.
Stock-Based Compensation	Stock-Based Compensation Stock options, performance shares, deferred stock units and restricted stock units have been granted under Edison International's long-term incentive compensation programs. For equity awards that are settled in common stock, Edison International either issues new common stock, or uses a third party to purchase shares from the market and deliver such shares for the settlement of the awards. The performance shares granted during 2018 that are earned, have been or will be settled solely in cash. The performance shares granted in 2019 and 2020 that are earned, will be settled in common stock. Stock options, deferred stock units and restricted stock units are settled in common stock. However, for awards that are otherwise settled entirely in common stock, Edison International substitutes cash awards to the extent necessary to satisfy applicable tax withholding obligations or government levies. Stock-based compensation expense is recognized, net of estimated forfeitures, on a straight-line basis over the requisite service period based on estimated fair values. For equity awards paid in common stock, fair value is determined at the grant date. However, with respect to the portion of the performance shares payable in common stock that are subject to market and financial performance conditions defined in the grants, the number of performance shares expected to be earned is subject to revision and updated at each reporting period, with a related adjustment to compensation expense. Awards paid in cash are classified as share-based liability awards and fair value is remeasured at each reporting date with the related compensation cost adjusted. For awards granted to retirement-eligible participants, stock compensation expense is recognized on a prorated basis over the initial year. For awards granted to participants who become eligible for retirement during the requisite service period, stock compensation expense is recognized over the period between the date of grant and the date the participant first becomes eligible for retirement. Edison International and SCE estimate the number of awards that are expected to vest rather than account for forfeitures when they occur. Share-based payments may create a permanent difference between the amount of compensation expense recognized for book and tax purposes. The tax impact of this permanent difference is recognized in earnings in the period it is created. See Note 9 for further information.
SCE Dividends	SCE Dividends CPUC holding company rules require that SCE's dividend policy be established by SCE's Board of Directors on the same basis as if SCE were a stand-alone utility company, and that the capital requirements of SCE, as deemed to be necessary to meet SCE's electricity service obligations, shall receive first priority from the Boards of Directors of both Edison International and SCE. In addition, the CPUC regulates SCE's capital structure which limits the dividends it may pay to its shareholders. Effective January 1, 2020, the common equity component of SCE's CPUC authorized capital structure was increased from 48% to 52% on a weighted average basis over the January 1, 2020 to December 31, 2022 compliance period. Under AB 1054, the impact of SCE's contributions to the Wildfire Insurance Fund are excluded from the measurement of SCE's CPUC-jurisdictional authorized capital structure. For further information, see Note 12. In May 2020, the CPUC issued a decision on SCE's application to the CPUC for waiver of compliance with its equity ratio requirement, that allows SCE to exclude from its equity ratio calculations (i) net charges accrued in connection with the 2017/2018 Wildfire/Mudslide Events and (ii) debt issued for the purpose of paying claims related to the 2017/2018 Wildfire/Mudslide Events up to an amount equal to the net charges accrued in connection with the 2017/2018 Wildfire/Mudslide Events. The temporary exclusion will lapse on May 7, 2022 or when a determination regarding cost recovery for the 2017/2018 Wildfire/Mudslide Events is made, whichever comes earlier. If the CPUC has not made a determination regarding cost recovery by May 7, 2022, SCE is permitted to file another application for a waiver of compliance with its equity ratio requirement. In the interim, SCE is required to notify the CPUC if an adverse financial event reduces SCE's spot equity ratio by more than one percent from the level most recently filed with the CPUC in the proceeding. The last spot equity ratio SCE filed with the CPUC in the proceeding did not exclude the then $1.8 billion net charge and was 45.2% as of December 31, 2018 (at the time the common equity component of SCE's CPUC authorized capital structure was required to remain at or above 48% on a weighted average basis over the applicable 37-month period). SCE’s spot equity ratio on December 31, 2018 would have been 48.7% had the $1.8 billion net charge at December 31, 2018 been excluded, therefore SCE will notify the CPUC if its spot ratio drops below 47.7% in any quarter. For further information, see Note 12. SCE monitors its compliance with the CPUC's equity ratio requirement based on the weighted average of the common equity component of SCE's CPUC authorized capital structure over the Capital Structure Compliance Period using its actual capital structure from the beginning of the Capital Structure Compliance Period through the reporting date together with forecasted performance and expected financing activities for the remainder of the Capital Structure Compliance Period. SCE expects to be compliant with its CPUC authorized capital structure at December 31, 2022. As a California corporation, SCE's ability to pay dividends is also governed by the California General Corporation Law. California law requires that for a dividend to be declared: (a) retained earnings must equal or exceed the proposed dividend, or (b) immediately after the dividend is made, the value of the corporation's assets must exceed the value of its liabilities plus amounts required to be paid, if any, in order to liquidate stock senior to the shares receiving the dividend. Additionally, a California corporation may not declare a dividend if it is, or as a result of the dividend would be, likely to be unable to meet its liabilities as they mature. Prior to declaring dividends, SCE's Board of Directors evaluates available information, including when applicable, information pertaining to the 2017/2018 Wildfire/Mudslide Events, to ensure that the California law requirements for the declarations are met. On February 25, 2021, SCE declared a dividend to Edison International of $325 million. The timing and amount of future dividends are also dependent on a number of other factors including SCE's requirements to fund other obligations and capital expenditures, its ability to access the capital markets, and generate operating cash flows and earnings. If SCE incurs significant costs related to catastrophic wildfires, including the 2017/2018 Wildfire/Mudslide Events, and is unable to recover such costs through insurance, the Wildfire Insurance Fund (for fires after July 12, 2019), or from customers or is unable to access capital markets on reasonable terms, SCE may be limited in its ability to pay future dividends to Edison International and its preference shareholders.
Earnings Per Share	Earnings Per ShareEdison International computes earnings per common share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for each class of common stock and participating security. Edison International's participating securities are stock-based compensation awards, payable in common shares, which earn dividend equivalents on an equal basis with common shares once the awards are vested.
Income Taxes	Income Taxes Edison International and SCE estimate their income taxes for each jurisdiction in which they operate. This involves estimating current period tax expense along with assessing temporary differences resulting from differing treatment of items (such as depreciation) for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included in the consolidated balance sheets. Income tax expense includes the current tax liability from operations and the change in deferred income taxes during the year. Interest income, interest expense and penalties associated with income taxes are generally reflected in "Income tax expense" on the consolidated statements of income. Edison International's eligible subsidiaries are included in Edison International's consolidated federal income tax and combined state tax returns. Edison International has tax-allocation and payment agreements with certain of its subsidiaries. Pursuant to an income tax-allocation agreement approved by the CPUC, SCE's tax liability is computed as if it filed its federal and state income tax returns on a separate return basis.
New Accounting Guidance	New Accounting Guidance Accounting Guidance Adopted In June 2016, the Financial Accounting Standards Board ("FASB") issued an accounting standards update to require the use of the current expected credit loss model to measure impairment of financial assets measured at amortized cost, including trade and other receivables, and the use of an allowance to record estimated credit losses on available-for-sale debt securities. Edison International and SCE adopted this guidance on January 1, 2020 using the prospective adoption approach to available-for-sale debt securities and the modified retrospective approach to all other financial assets. The adoption of this guidance did not have a material impact on Edison International's and SCE's financial position or result of operations. See "Allowance for Uncollectible Accounts" and "Nuclear Decommissioning and Asset Retirement Obligations" above and Note 10 for further information. In August 2018, the FASB issued an accounting standards update which aligns the requirement for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal use software. The guidance also clarified presentation requirements for reporting implementation costs in the financial statements. Edison International and SCE adopted the standard on January 1, 2020 using the prospective adoption approach. The adoption of this guidance did not have a material impact on Edison International's and SCE's financial position or result of operations. In March 2020, the FASB issued an accounting standards update to provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions that reference London Inter-Bank Offered Rate ("LIBOR") or another reference rate expected to be discontinued because of reference rate reform. In January 2021, the FASB issued an update to this standard to clarify that certain optional expedients and exceptions for contract modifications and hedge accounting apply to derivatives that are affected by the reference rate transition. Edison International and SCE have adopted the standard as of April 1, 2020 prospectively. SCE generally does not use hedge accounting for derivative transactions. SCE has a term loan with a variable interest rate based on LIBOR. In addition, both Edison International and SCE have revolving credit facilities with a variable interest rate based on LIBOR. These agreements contain provisions that require an amendment if LIBOR can no longer be used. SCE also has certain preference stocks, for which the distributions will be payable at a floating rate referenced to LIBOR from 2022. As of December 31, 2020, both Edison International and SCE have not utilized any of the expedients and therefore there is no impact on adoption of the guidance, however, if contract amendments are made where LIBOR is no longer valid, both Edison International and SCE expect to utilize the expedients through the allowed period of December 31, 2022. In August 2018, the FASB issued an accounting standards update to remove, modify and add certain disclosure requirements related to employer-sponsored defined benefit pension or other postretirement plans. The guidance removes disclosure requirements that are no longer considered cost beneficial, clarifies certain specific disclosure requirements and adds disclosure requirements identified as relevant. The modifications only affect annual period disclosures and must be applied on a retrospective basis to all periods presented. Edison International and SCE have adopted this guidance for the year ending December 31, 2020. The adoption of this guidance did not materially affect the annual disclosures related to employer-sponsored defined benefit pension or other postretirement plans. See Note 9 for further information. Accounting Guidance Not Yet Adopted In August 2020, the FASB issued an accounting standards update to simplify the accounting for certain financial instruments with characteristics of liabilities and equity. The amendments in this update affect entities that issue convertible instruments indexed to or potentially settled in an entity's own equity. This guidance also simplifies an entity's application of the derivatives scope exception for contracts in its own equity and amend s certain aspects of the EPS guidance. The guidance is effective January 1, 2022 with early adoption permitted after January 1, 2021. Edison International and SCE do not expect the adoption of this standard will materially affect Edison International's and SCE's

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Cash Equivalents	The cash equivalents were as follows: Edison International SCE December 31, (in millions) 2020 2019 2020 2019 Money market funds $ 62 $ 31 $ 38 $ — Cash is temporarily invested until required for check clearing. Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows: Edison International SCE December 31, (in millions) 2020 2019 2020 2019 Book balances reclassified to accounts payable $ 69 $ 75 $ 69 $ 74
Cash, Cash Equivalents and Restricted Cash	The following table sets forth the cash, cash equivalents and restricted cash included in the consolidated statements of cash flows: (in millions) December 31, 2020 December 31, 2019 Edison International: Cash and cash equivalents $ 87 $ 68 Short-term restricted cash 1 2 2 Total cash, cash equivalents, and restricted cash $ 89 $ 70 SCE: Cash and cash equivalents $ 55 $ 24 Short-term restricted cash 1 1 — Total cash, cash equivalents, and restricted cash $ 56 $ 24
Changes in Allowance for Uncollectible Accounts	The following table sets forth the changes in allowance for uncollectible accounts for SCE: Year ended December 31, 2020 (in millions) Customers All others Beginning balance $ 35 $ 14 Plus: current period provision for uncollectible accounts Included in operation and maintenance expenses 36 9 Deferred to regulatory assets 120 — Less: write-offs, net of recoveries 16 10 Ending balance $ 175 $ 13
Estimated Useful Lives (Authorized by the CPUC) and Weighted-Average Useful Lives of Property, Plant and Equipment	Estimated useful lives authorized by the CPUC in the 2018 General Rate Case ("GRC") and weighted average useful lives of SCE's property, plant and equipment, are as follows: Estimated Useful Lives Weighted Average Useful Lives Generation plant 10 years to 55 years 36 years Distribution plant 20 years to 65 years 48 years Transmission plant 45 years to 65 years 54 years General plant and other 5 years to 60 years 25 years
Reconciliation of the Changes in ARO Liability	The following table summarizes the changes in SCE's ARO liability: December 31, (in millions) 2020 2019 Beginning balance $ 3,029 $ 3,031 Accretion 1 160 166 Revisions (36) 4 Liabilities settled (223) (172) Ending balance $ 2,930 $ 3,029 1 An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting.
Amortization of Deferred Financing Costs	Amortization of deferred financing costs charged to interest expense is as follows: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Amortization of deferred financing costs charged to interest expense $ 32 $ 30 $ 30 $ 27 $ 26 $ 26
EPS Attributable to Edison International Common Shareholders	EPS attributable to Edison International common shareholders was computed as follows: Years ended December 31, (in millions, except per share amounts) 2020 2019 2018 Basic earnings (loss) per share – continuing operations: Income (loss) from continuing operations attributable to common shareholders $ 739 $ 1,284 $ (457) Participating securities dividends — — — Income (loss) from continuing operations available to common shareholders 739 1,284 (457) Weighted average common shares outstanding 373 340 326 Basic earnings (loss) per share – continuing operations 1.98 3.78 (1.40) Diluted earnings (loss) per share – continuing operations: Income (loss) from continuing operations attributable to common shareholders 739 1,284 (457) Participating securities dividends — — — Income (loss) from continuing operations available to common shareholders 739 1,284 (457) Income impact of assumed conversions — — — Income (loss) from continuing operations available to common shareholders and assumed conversions 739 1,284 (457) Weighted average common shares outstanding 373 340 326 Incremental shares from assumed conversions 1 1 1 — Adjusted weighted average shares – diluted 374 341 326 Diluted earnings (loss) per share – continuing operations $ 1.98 $ 3.77 $ (1.40) 1 Due to the loss reported for the year ended December 31, 2018, incremental shares were not included as the effect would be antidilutive.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant, and Equipment	SCE's property, plant and equipment included in the consolidated balance sheets is composed of the following: December 31, (in millions) 2020 2019 Distribution $ 28,663 $ 26,929 Transmission 15,669 14,720 Generation 3,709 3,664 General plant and other 5,129 4,583 Accumulated depreciation (10,681) (9,958) 42,489 39,938 Construction work in progress 5,033 4,131 Nuclear fuel, at amortized cost 131 129 Total utility property, plant and equipment $ 47,653 $ 44,198
Schedule of Jointly Owned Utility Projects	The following is SCE's investment in each asset as of December 31, 2020: (in millions) Plant in Service Construction Work in Progress Accumulated Nuclear Fuel Net Book Value Ownership Transmission systems: Eldorado $ 324 $ 74 $ 39 $ — $ 359 79 % Pacific Intertie 346 — 74 — 272 50 % Generating station: Palo Verde (nuclear) 2,113 53 1,609 131 688 16 % Total $ 2,783 $ 127 $ 1,722 $ 131 $ 1,319

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of the Trusts' Income Statements	The following table provides a summary of the trusts' income statements: Years ended December 31, (in millions) Trust II Trust III Trust IV Trust V Trust VI 2020 Dividend income $ 20 $ 16 $ 17 $ 16 $ 24 Dividend distributions 20 16 17 16 24 2019 Dividend income $ 20 $ 16 $ 17 $ 16 $ 24 Dividend distributions 20 16 17 16 24 2018 Dividend income $ 20 $ 16 $ 17 $ 16 $ 24 Dividend distributions 20 16 17 16 24

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amounts and Fair Values of Long-term Debt, Including Current Portion	The carrying value and fair value of Edison International's and SCE's long-term debt (including current portion of long-term debt) are as follows: December 31, 2020 December 31, 2019 (in millions) Carrying Value 1 Fair Value 2 Carrying Value 1 Fair Value 2 Edison International $ 20,337 $ 23,824 $ 18,343 $ 20,137 SCE 17,204 20,365 15,211 16,892 1 Carrying value is net of debt issuance costs. 2 The fair value of Edison International's and SCE's long-term debt is classified as Level 2.
SCE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value by Level with in the Fair Value Hierarchy	The following table sets forth assets and liabilities of SCE that were accounted for at fair value by level within the fair value hierarchy: December 31, 2020 (in millions) Level 1 Level 2 Level 3 Netting and Collateral 1 Total Assets at fair value Derivative contracts $ — $ 6 $ 120 $ (18) $ 108 Other 39 23 — — 62 Nuclear decommissioning trusts: Stocks 2 1,908 — — — 1,908 Fixed Income 3 519 2,113 — — 2,632 Short-term investments, primarily cash equivalents 447 52 — — 499 Subtotal of nuclear decommissioning trusts 4 2,874 2,165 — — 5,039 Total assets 2,913 2,194 120 (18) 5,209 Liabilities at fair value Derivative contracts — 10 12 (22) — Total liabilities — 10 12 (22) — Net assets $ 2,913 $ 2,184 $ 108 $ 4 $ 5,209 December 31, 2019 (in millions) Level 1 Level 2 Level 3 Netting and Collateral 1 Total Assets at fair value Derivative contracts $ — $ 19 $ 83 $ (15) $ 87 Other 4 14 — — 18 Nuclear decommissioning trusts: Stocks 2 1,765 — — — 1,765 Fixed Income 3 738 2,024 — — 2,762 Short-term investments, primarily cash equivalents 98 48 — — 146 Subtotal of nuclear decommissioning trusts 4 2,601 2,072 — — 4,673 Total assets 2,605 2,105 83 (15) 4,778 Liabilities at fair value Derivative contracts — 11 5 (15) 1 Total liabilities — 11 5 (15) 1 Net assets $ 2,605 $ 2,094 $ 78 $ — $ 4,777 1 Represents the netting of assets and liabilities under master netting agreements and cash collateral. 2 Approximately 71% and 72% of SCE's equity investments were located in the United States at December 31, 2020 and 2019, respectively. 3 Includes corporate bonds, which were diversified and included collateralized mortgage obligations and other asset backed securities of $29 million and $46 million at December 31, 2020 and 2019, respectively.
Summary of Changes in Fair Value of Level 3 Net Derivative Assets and Liabilities	The following table sets forth a summary of changes in SCE's fair value of Level 3 net derivative assets and liabilities: December 31, (in millions) 2020 2019 Fair value of net assets at beginning of period $ 78 $ 141 Purchases 8 6 Sales (5) (5) Settlements (117) (60) Total realized/unrealized gains (losses) 1,2 144 (4) Fair value of net assets at end of period $ 108 $ 78 1 Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities. 2 There were no material transfers into or out of Level 3 during 2020 and 2019.
Valuation Techniques and Significant Unobservable Inputs Used to Determine Fair Value for Level 3 Assets and Liabilities	The following table sets forth SCE's valuation techniques and significant unobservable inputs used to determine fair value for significant Level 3 assets and liabilities: Fair Value (in millions) Significant Range (per MWh) Weighted Average (per MWh) Assets Liabilities Valuation Technique Unobservable Input Congestion revenue rights December 31, 2020 $ 120 $ 12 Auction prices CAISO CRR auction clearing prices $(9.67) - $300.47 $2.75 December 31, 2019 83 5 Auction prices CAISO CRR auction clearing prices (3.59) - 25.32 1.97

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-term Debt	The following table summarizes long-term debt (rates and terms are as of December 31, 2020) of Edison International and SCE: December 31, (in millions) 2020 2019 Edison International Parent and Other: Debentures and notes: 2022 – 2028 (2.40% to 5.75%) $ 3,150 $ 3,150 Current portion of long-term debt — (400) Unamortized debt discount/premium and issuance costs, net (17) (18) Total Edison International Parent and Other 3,133 2,732 SCE: First and refunding mortgage bonds: 2022 – 2050 (1.20% to 6.05%) 16,843 14,272 Pollution-control bonds: 2023 (2.63%) 135 752 Debentures and notes: 2029 – 2053 (5.06% to 6.65%) 306 306 Other long-term debt 1 : 324 — Current portion of long-term debt (1,029) (79) Unamortized debt discount/premium and issuance costs, net (80) (119) Total SCE 16,499 15,132 Total Edison International $ 19,632 $ 17,864 1 Subsequent to December 31, 2020, SCE issued first and refunding mortgage bonds which were used to partially pay down its commercial paper balance, see "Debt Financing Subsequent to December 31, 2020" for more information. Accordingly, SCE included the pay down amount of $324 million in other long-term debt.
Long-term Debt Maturities	Edison International and SCE long-term debt maturities over the next five years are as follows: (in millions) Edison International SCE 2021 $ 1,029 $ 1,029 2022 1,064 364 2023 1,435 1,035 2024 500 — 2025 1,300 900
Summary for Status of Credit Facilities	The following table summarizes the status of the credit facilities at December 31, 2020: (in millions, except for rates) Execution date Termination date LIBOR plus (bps) Use of proceeds Commitment Outstanding borrowings Outstanding letters of credit Amount available Edison International Parent June 2019 May 2024 128 Support commercial paper borrowings and general corporate purposes 1, 4 $ 1,500 $ 130 $ — $ 1370 Total Edison International Parent: $ 1,500 $ 130 $ — $ 1,370 SCE March 2020 March 2021 65 Finance a portion of the AB 1054 Capital Expenditures 2 $ 800 $ 495 $ — $ 305 May 2020 May 2021 150 Undercollections related to COVID-19 and general corporate purposes 1,500 — — 1,500 June 2019 May 2024 108 Support commercial paper borrowings and general corporate purposes 3, 4 3,000 725 159 2,116 Total SCE: $ 5,300 $ 1,220 $ 159 $ 3,921 Total Edison International: $ 6,800 $ 1,350 $ 159 $ 5,291 1 At December 31, 2020 Edison International Parent had $130 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.42%. At December 31, 2019 Edison International Parent did not have any outstanding commercial paper. 2 This credit facility may be extended for two 364-day periods, at the lenders' discretion. The aggregate maximum principal amount may be increased up to $1.1 billion provided that additional lender commitments are obtained. 3 At December 31, 2020 and December 31, 2019, SCE had $725 million and $550 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.43% and 2.24%, respectively. As of December 31, 2020, $324 million outstanding commercial paper was classified as long-term debt due to subsequent refinancing. See "Debt Financing Subsequent to December 31, 2020" for more information. 4 The aggregate maximum principal amount under the SCE and Edison International Parent revolving credit facilities may be increased up to $4.0 billion and $2.0 billion, respectively, provided that additional lender commitments are obtained. The following table summarizes the status of the credit facility at December 31, 2020: (in millions) Commitment $ 1,500 Outstanding borrowings 1 130 Amount available $ 1,370 1 At December 31, 2020 Edison International Parent had $130 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.42%. At December 31, 2019 Edison International Parent did not have any outstanding commercial paper.
Schedule of Short-term Debt	The following table summarizes the status of SCE's term loan and other short-term debt as of December 31, 2020: (in millions, except for rates) Issuance Date Maturity LIBOR plus (bps) Use of Proceeds Issuance Amount Term loan March 2020 March 2021 60 Fund a portion of the AB 1054 Excluded Capital Expenditures $ 475 Floating rate first and refunding mortgage bonds December 2020 December 2021 27 Partial repayment of AB 1054 credit facility and commercial paper borrowings and for general corporate purposes 900

Derivative Instruments (Tables)

Derivative Instruments (Tables) - SCE	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Schedule of Derivative Liabilities in Statement of Financial Position, Fair Value	The following table summarizes the gross and net fair values of SCE's commodity derivative instruments: December 31, 2020 Derivative Assets Derivative Liabilities Net Asset (in millions) Short-Term 1 Long-Term 2 Subtotal Short-Term 3 Long-Term Subtotal Commodity derivative contracts Gross amounts recognized $ 103 $ 23 $ 126 $ 16 $ 6 $ 22 $ 104 Gross amounts offset in the consolidated balance sheets (12) (6) (18) (12) (6) (18) — Cash collateral posted 4 — — — (4) — (4) 4 Net amounts presented in the consolidated balance sheets $ 91 $ 17 $ 108 $ — $ — $ — $ 108 December 31, 2019 Derivative Assets Derivative Liabilities Net Asset (in millions) Short-Term 1 Long-Term 2 Subtotal Short-Term 3 Long-Term Subtotal Commodity derivative contracts Gross amounts recognized $ 94 $ 8 $ 102 $ 14 $ 2 $ 16 $ 86 Gross amounts offset in the consolidated balance sheets (13) (2) (15) (13) (2) (15) — Cash collateral posted 4 — — — — — — — Net amounts presented in the consolidated balance sheets $ 81 $ 6 $ 87 $ 1 $ — $ 1 $ 86 1 Included in "Other current assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 3 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 4 At December 31, 2020, SCE posted $17 million of cash, of which $4 million was offset against derivative liabilities and $13 million was reflected in "Other current assets" on the consolidated balance sheets. At December 31, 2019, SCE posted $24 million of cash, all of which was not offset against net derivative liabilities and was reflected in "Other current assets" on the consolidated balance sheets.
Schedule of Derivative Assets in Statement of Financial Position, Fair Value	The following table summarizes the gross and net fair values of SCE's commodity derivative instruments: December 31, 2020 Derivative Assets Derivative Liabilities Net Asset (in millions) Short-Term 1 Long-Term 2 Subtotal Short-Term 3 Long-Term Subtotal Commodity derivative contracts Gross amounts recognized $ 103 $ 23 $ 126 $ 16 $ 6 $ 22 $ 104 Gross amounts offset in the consolidated balance sheets (12) (6) (18) (12) (6) (18) — Cash collateral posted 4 — — — (4) — (4) 4 Net amounts presented in the consolidated balance sheets $ 91 $ 17 $ 108 $ — $ — $ — $ 108 December 31, 2019 Derivative Assets Derivative Liabilities Net Asset (in millions) Short-Term 1 Long-Term 2 Subtotal Short-Term 3 Long-Term Subtotal Commodity derivative contracts Gross amounts recognized $ 94 $ 8 $ 102 $ 14 $ 2 $ 16 $ 86 Gross amounts offset in the consolidated balance sheets (13) (2) (15) (13) (2) (15) — Cash collateral posted 4 — — — — — — — Net amounts presented in the consolidated balance sheets $ 81 $ 6 $ 87 $ 1 $ — $ 1 $ 86 1 Included in "Other current assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 3 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 4 At December 31, 2020, SCE posted $17 million of cash, of which $4 million was offset against derivative liabilities and $13 million was reflected in "Other current assets" on the consolidated balance sheets. At December 31, 2019, SCE posted $24 million of cash, all of which was not offset against net derivative liabilities and was reflected in "Other current assets" on the consolidated balance sheets.
Components of Economic Hedging Activity	The following table summarizes the components of SCE's economic hedging activity: Years ended December 31, (in millions) 2020 2019 2018 Realized gains (losses) $ 87 $ (7) $ 26 Unrealized gains (losses) 17 (74) 82
Notional Volumes of Derivative Instruments	The following table summarizes the notional volumes of derivatives used for SCE economic hedging activities: Economic Hedges Unit of December 31, Commodity Measure 2020 2019 Electricity options, swaps and forwards GWh 1,581 3,155 Natural gas options, swaps and forwards Bcf 34 43 Congestion revenue rights GWh 41,151 48,170

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Summary of Revenue	The following table is a summary of SCE's revenue: Years ended December 31, 2020 2019 2018 (in millions) Earning Activities Cost- Recovery Activities Total Consolidated Earning Activities Cost- Recovery Activities Total Consolidated Earning Activities Cost-Recovery Activities Total Consolidated Revenues from contracts with customers 1,2 $ 6,920 $ 5,539 $ 12,459 $ 6,512 $ 4,655 $ 11,167 $ 6,519 $ 5,611 $ 12,130 Alternative revenue programs and other operating revenue 3 548 539 1,087 166 973 1,139 41 440 481 Total operating revenue $ 7,468 $ 6,078 $ 13,546 $ 6,678 $ 5,628 $ 12,306 $ 6,560 $ 6,051 $ 12,611 1 In the absence of a 2018 GRC decision, SCE recognized CPUC revenue in 2018 and first quarter of 2019 based on the 2017 authorized revenue requirements adjusted mainly for the July 2017 cost of capital decision and Tax Reform. SCE recorded the impact of the 2018 GRC final decision in the second quarter of 2019, including a $289 million reduction in revenue related to 2018. These revenue adjustments are included in "Revenues from contracts with customers." See "Note 1. Summary of Significant Accounting Policies—Revenue Recognition—Regulatory Proceedings—2018 General Rate Case" for further information. 2 At December 31, 2020 and 2019, SCE's receivables related to contracts from customers were $1.5 billion and $1.1 billion, which included accrued unbilled revenue of $521 million and $488 million, respectively. 3 Includes differences between amounts billed and authorized levels for both the CPUC and FERC.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Components of Income Tax (Benefit) Expense by Location of Taxing Jurisdiction	The components of income tax (benefit) expense by location of taxing jurisdiction are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Current: Federal $ 13 $ — $ (57) $ 12 $ — $ (51) State (22) 6 (155) (26) 14 (93) (9) 6 (212) (14) 14 (144) Deferred: Federal (230) (243) (386) (207) (206) (354) State (66) (41) (141) (56) (37) (198) (296) (284) (527) (263) (243) (552) Total continuing operations (305) (278) (739) (277) (229) (696) Discontinued operations 1 — — (34) — — — Total $ (305) $ (278) $ (773) $ (277) $ (229) $ (696) 1 In the fourth quarter of 2018, Edison International and SCE recognized tax benefits related to a settlement with the California Franchise Tax Board for tax years 1994 –
Components of Net Accumulated Deferred Income Tax Liability	The components of net accumulated deferred income tax liability are: Edison International SCE December 31, (in millions) 2020 2019 2020 2019 Deferred tax assets: Property $ 590 $ 478 $ 540 $ 435 Wildfire-related 1 1,134 847 1,134 847 Nuclear decommissioning trust assets in excess of nuclear ARO liability 515 449 515 449 Loss and credit carryforwards 2 1,991 1,515 683 253 Regulatory asset 841 739 841 739 Pension and postretirement benefits other than pensions, net 163 170 35 40 Other 513 408 527 416 Sub-total 5,747 4,606 4,275 3,179 Less: valuation allowance 3 35 35 — — Total 5,712 4,571 4,275 3,179 Deferred tax liabilities: Property 8,879 8,244 8,871 8,234 Regulatory liability 1,111 570 1,111 570 Nuclear decommissioning trust assets 515 449 515 449 Other 514 320 499 310 Total 11,019 9,583 10,996 9,563 Accumulated deferred income tax liability, net 4 $ 5,307 $ 5,012 $ 6,721 $ 6,384 1 Relates to accrued estimated losses for wildfire-related claims, net of expected recoveries from insurance and FERC customers, and contributions to the Wildfire Insurance Fund. For further information, see Note 12 and Note 1. 2 As of December 31, 2020, deferred tax assets for net operating loss and tax credit carryforwards are reduced by unrecognized tax benefits of $270 million and $190 million for Edison International and SCE, respectively. 3 As of December 31, 2020, Edison International has recorded a valuation allowance of $31 million for non-California state net operating loss carryforwards, and $4 million for California capital losses generated from sale of SoCore Energy in 2018, which are estimated to expire before being utilized.
Summary of Net Operating Loss and Tax Credit Carryforwards	The amounts of net operating loss and tax credit carryforwards (after-tax) are as follows: Edison International SCE December 31, 2020 (in millions) Loss Carryforwards Credit Carryforwards Loss Carryforwards Credit Carryforwards Expire in 2021 $ 4 $ — $ 4 $ — Expire between 2022 to 2025 31 — 26 — Expire between 2029 to 2042 1,192 515 380 50 No expiration date 1 509 10 413 — Total $ 1,736 $ 525 $ 823 $ 50 1 Under Tax Reform, federal net operating losses generated after December 31, 2017 can carryforward indefinitely.
Reconciliation of Income Tax Expense	The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Income (loss) from continuing operations before income taxes $ 566 $ 1,127 $ (1,089) $ 665 $ 1,301 $ (885) Provision for income tax at federal statutory rate of 21% 119 237 (229) 140 273 (186) Increase in income tax from: Items presented with related state income tax, net: State tax, net of federal benefit (61) (22) (168) (52) (13) (155) Property-related (320) (303) (275) (320) (303) (275) Change related to uncertain tax positions 1 (15) — (66) (19) — (71) Deferred tax re-measurement 2 — (88) — — (88) — 2018 GRC Final Decision — (80) — — (80) — Corporate-owned life insurance cash surrender value (8) (8) (8) (8) (8) (8) Other (20) (14) 7 (18) (10) (1) Total income tax benefit from continuing operations $ (305) $ (278) $ (739) $ (277) $ (229) $ (696) Effective tax rate (53.9) % (24.7) % (67.9) % (41.7) % (17.6) % (78.6) % 1 In 2020, Edison International and SCE recognized tax expense and benefit, respectively, primarily due to the re-measurement of uncertain tax positions related to the 2010 – 2012 California state tax filings currently under audit. In 2018, Edison International and SCE recognized tax benefits related to a settlement with the California Franchise Tax Board for tax years 1994 – 2006. See further discussion in Tax Disputes below. 2 Relates to changes in the allocation of deferred tax re-measurement between customers and shareholders as a result of a CPUC resolution issued in February 2019. The resolution determined that customers are only entitled to excess deferred taxes which were included when setting rates, while other deferred tax re-measurement belongs to the shareholders.
Reconciliation of Unrecognized Tax Benefits	The following table provides a reconciliation of unrecognized tax benefits for continuing and discontinued operations: Edison International SCE December 31, (in millions) 2020 2019 2018 2020 2019 2018 Balance at January 1, $ 370 $ 338 $ 432 $ 282 $ 249 $ 331 Tax positions taken during the current year: Increases 55 46 41 56 47 42 Tax positions taken during a prior year: Increases 1 274 6 — 4 6 — Decreases 2 (20) (20) (108) (22) (20) (121) Settlements with taxing authorities 3 — — (27) — — (3) Balance at December 31, $ 679 $ 370 $ 338 $ 320 $ 282 $ 249 1 Edison International recorded favorable tax positions in 2020 in connection with the Edison Mission Energy ("EME") bankruptcy that required a revaluation of the reserve for uncertain tax positions. 2 Decrease in 2018 was related to re-measurement as a result of a settlement with the California Franchise Tax Board for tax years 1994 – 2006. 3 In 2018, Edison International reached a settlement with the California Franchise Tax Board for tax years 1994 – 2006.
Schedule of Interest and Penalties Related to Income Tax Liabilities	The total amount of accrued interest and penalties related to income tax liabilities for continuing and discontinued operations are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Accrued interest and penalties $ 52 $ 56 $ 23 $ 29 The net after-tax interest and penalties recognized in income tax expense (benefit) for continuing and discontinued operations are: Edison International SCE December 31, (in millions) 2020 2019 2018 2020 2019 2018 Net after-tax interest and penalties tax expense (benefit) $ 4 $ 4 $ (62) $ 6 $ 3 $ (25)

Compensation and Benefit Plans

Compensation and Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Pension and Other Postretirement Benefits [Line Items]
Employee Savings Plan Employer Contributions	The 401(k) defined contribution savings plan is designed to supplement employees' retirement income. The employer contributions were as follows: Edison International SCE (in millions) Years ended December 31, 2020 $ 93 $ 92 2019 82 81 2018 74 74
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The following table summarizes total expense and tax benefits associated with stock-based compensation: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Stock-based compensation expense 1 : Stock options $ 15 $ 13 $ 11 $ 7 $ 7 $ 6 Performance shares 5 8 1 2 4 1 Restricted stock units 8 6 7 4 3 4 Other 1 2 2 — — — Total stock-based compensation expense 29 29 21 13 14 11 Income tax benefits related to stock compensation expense $ 4 $ 10 $ 6 $ 3 $ 6 $ 3 1 Reflected in "Operation and maintenance" on Edison International's and SCE's consolidated statements of income.
Black-Sholes Option-Pricing Model Assumptions	The Black-Scholes option-pricing model requires various assumptions noted in the following table: Years ended December 31, 2020 2019 2018 Expected terms (in years) 5.2 5.5 5.7 Risk-free interest rate 0.4% - 0.6% 1.6% - 2.3% 2.6% - 3.0% Expected dividend yield 4.2% - 5.0% 3.3% - 4.0% 3.6% - 4.3% Weighted average expected dividend yield 4.7% 3.9% 3.8% Expected volatility 24.9% - 26.9% 21.7% -24.1% 20.9% - 21.9% Weighted average volatility 25.0% 21.8% 20.9%
Summary of Stock Options Activity	The following is a summary of the status of Edison International's stock options: Weighted Average Stock Options Exercise Remaining Aggregate Edison International: Outstanding at December 31, 2019 9,278,677 $ 62.27 Granted 1,993,954 68.60 Forfeited or expired (203,340) 65.75 Exercised 1 (359,908) 48.59 Outstanding at December 31, 2020 10,709,383 63.85 6.03 Vested and expected to vest at December 31, 2020 10,391,796 63.60 6.17 $ 30 Exercisable at December 31, 2020 6,489,876 $ 62.08 4.83 $ 27 SCE: Outstanding at December 31, 2019 4,934,702 $ 61.01 Granted 1,053,923 68.27 Forfeited or expired (189,691) 65.75 Exercised 1 (302,911) 49.49 Affiliate transfers, net (5,535) 63.36 Outstanding at December 31, 2020 5,490,488 62.85 5.86 Vested and expected to vest at December 31, 2020 5,325,052 62.50 5.98 $ 20 Exercisable at December 31, 2020 3,361,238 $ 60.41 4.56 $ 19 1 Edison International and SCE recognized tax benefits of $2 million and $2 million, respectively, from stock options exercised in 2020.
Schedule of Unrecognized Compensation Expense	At December 31, 2020, total unrecognized compensation cost related to stock options and the weighted average period the cost is expected to be recognized are as follows: Edison International SCE Unrecognized compensation cost, net of expected forfeitures (in millions) $ 17 $ 9 Weighted average period (in years) 2.3 2.3
Supplemental Data on Stock-based Compensation	Supplemental Data on Stock Options Edison International SCE Years ended December 31, (in millions, except per award amounts) 2020 2019 2018 2020 2019 2018 Stock options: Weighted average grant date fair value per option granted $ 8.18 $ 8.80 $ 8.21 $ 8.16 $ 8.83 $ 8.22 Fair value of options vested 2 14 14 2 7 7 Value of options exercised 9 27 10 7 19 7
Summary of Nonvested Share Activity	The following is a summary of the status of Edison International's nonvested performance shares: Equity Awards Liability Awards Shares Weighted Average Shares Weighted Average Grant Date Edison International: Nonvested at December 31, 2019 119,843 $ 66.03 113,186 $ 67.30 Granted 120,938 67.55 — Forfeited (7,157) 66.76 (3,825) Vested 1 — — (109,361) Nonvested at December 31, 2020 233,624 $ 66.80 — $ — SCE: Nonvested at December 31, 2019 63,172 $ 66.27 58,399 $ 67.34 Granted 64,133 67.15 — Forfeited (6,408) 66.78 (3,409) Vested 1 — — (54,578) Affiliate transfers, net (253) 71.27 (412) Nonvested at December 31, 2020 120,644 $ 66.70 — $ — 1 Relates to performance shares that will be paid in 2021 as performance targets were met at December 31, 2020.
Summary of Nonvested Restricted Stock Units Activity	The following is a summary of the status of Edison International's nonvested restricted stock units: Edison International SCE Restricted Weighted Average Restricted Weighted Average Nonvested at December 31, 2019 311,682 $ 66.11 159,985 $ 66.16 Granted 119,038 68.58 63,042 68.24 Forfeited (11,294) 63.90 (10,095) 63.93 Vested (85,553) 78.94 (42,549) 79.11 Affiliate transfers, net — — (1,963) 68.16 Nonvested at December 31, 2020 333,873 $ 63.78 168,420 $ 63.78
Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan	Information on pension plan assets and benefit obligations for continuing and discontinued operations is shown below. Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Change in projected benefit obligation Projected benefit obligation at beginning of year $ 4,139 $ 3,880 $ 3,662 $ 3,431 Service cost 121 114 117 110 Interest cost 124 155 110 138 Actuarial loss 323 240 292 199 Benefits paid (231) (250) (197) (216) Projected benefit obligation at end of year $ 4,476 $ 4,139 $ 3,984 $ 3,662 Change in plan assets Fair value of plan assets at beginning of year $ 3,755 $ 3,321 $ 3,541 $ 3,124 Actual return on plan assets 584 611 551 576 Employer contributions 62 73 45 57 Benefits paid (230) (250) (197) (216) Fair value of plan assets at end of year 4,171 3,755 3,940 3,541 Funded status at end of year $ (305) $ (384) $ (44) $ (121) Amounts recognized in the consolidated balance sheets consist of 1 : Current liabilities (24) (19) (2) (2) Long-term liabilities (281) (365) (42) (119) $ (305) $ (384) $ (44) $ (121) Amounts recognized in accumulated other comprehensive loss consist of: Prior service cost $ (1) $ (1) $ — $ — Net loss 1 96 95 16 17 95 94 16 17 Amounts recognized as a regulatory asset 12 87 12 87 Total not yet recognized as expense $ 107 $ 181 $ 28 $ 104 Accumulated benefit obligation at end of year $ 4,238 $ 3,968 $ 3,776 $ 3,529 Pension plans with an accumulated benefit obligation in excess of plan assets: Projected benefit obligation 4,476 4,139 3,984 3,662 Accumulated benefit obligation 4,238 3,968 3,776 3,529 Fair value of plan assets 4,171 3,755 3,940 3,541 Weighted average assumptions used to determine obligations at end of year: Discount rate 2.38 % 3.11 % 2.38 % 3.11 % Rate of compensation increase 4.00 % 4.10 % 4.00 % 4.10 % 1 The SCE liability excludes a long-term payable due to Edison International Parent of $139 million and $133 million at December 31, 2020 and 2019, respectively, related to certain SCE postretirement benefit obligations transferred to Edison International Parent. SCE's accumulated other comprehensive loss of $16 million and $17 million at December 31, 2020 and 2019, excludes net losses of $41 million and $37 million related to these benefits, respectively.
Expense Components for Plans	Net periodic pension expense components for continuing operations are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Service cost $ 121 $ 114 $ 126 $ 119 $ 111 $ 123 Non-service cost Interest cost 124 155 140 114 143 128 Expected return on plan assets (215) (205) (228) (203) (194) (214) Amortization of prior service cost 2 2 3 1 2 3 Amortization of net loss 10 7 9 7 5 6 Regulatory adjustment (deferred) 16 (3) 15 16 (3) 15 Total non-service benefit (63) (44) (61) (65) (47) (62) Total expense recognized $ 58 $ 70 $ 65 $ 54 $ 64 $ 61
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income	Other changes in pension plan assets and benefit obligations recognized in other comprehensive loss for continuing operations: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Net loss $ 11 $ 19 $ 5 $ 9 $ 21 $ 5 Amortization of net loss (10) (7) (9) (7) (5) (6) Total recognized in other comprehensive loss 1 12 (4) 2 16 (1) Total recognized in expense and other comprehensive loss $ 59 $ 82 $ 61 $ 56 $ 80 $ 60
Schedule of Assumptions Used	Edison International and SCE used the following weighted average assumptions to determine pension expense for continuing operations: Years ended December 31, 2020 2019 2018 Discount rate 3.11 % 4.19 % 3.46 % Rate of compensation increase 4.10 % 4.10 % 4.10 % Expected long-term return on plan assets 6.00 % 6.50 % 6.50 % Interest crediting rate for cash balance account Starting rate 3.61 % 4.46 % 4.36 % Ultimate rate 5.00 % 5.75 % 5.75 % Year ultimate rate is reached 2025 2022 2022
Schedule of Expected Benefit Payments	The following benefit payments, which reflect expected future service, are expected to be paid: (in millions) Edison International SCE 2021 $ 294 $ 254 2022 297 259 2023 298 262 2024 299 266 2025 302 268 2026 – 2030 1,403 1,317
Postretirement Benefits Other than Pension Plan Assets by Hierarchy Levels	The following table sets forth the Master Trust investments for Edison International and SCE that were accounted for at fair value as of December 31, 2020 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 151 $ 1,006 $ — $ 1,157 Corporate stocks 3 570 5 — 575 Corporate bonds 4 — 601 — 601 Common/collective funds 5 — — 1,017 1,017 Partnerships/joint ventures 6 — — 569 569 Other investment entities 7 — — 137 137 Registered investment companies 8 69 — 23 92 Interest-bearing cash 7 — — 7 Other — 39 — 39 Total $ 797 $ 1,651 $ 1,746 $ 4,194 Receivables and payables, net (23) Combined net plan assets available for benefits 4,171 SCE's share of net plan assets $ 3,940 The following table sets forth the Master Trust investments that were accounted for at fair value as of December 31, 2019 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 146 $ 992 $ — $ 1,138 Corporate stocks 3 547 7 — 554 Corporate bonds 4 — 572 — 572 Common/collective funds 5 — — 693 693 Partnerships/joint ventures 6 — — 471 471 Other investment entities 7 — — 130 130 Registered investment companies 8 133 — — 133 Interest-bearing cash 7 — — 7 Other — 79 — 79 Total $ 833 $ 1,650 $ 1,294 $ 3,777 Receivables and payables, net (22) Combined net plan assets available for benefits 3,755 SCE's share of net plan assets $ 3,541 1 These investments are measured at fair value using the net asset value per share practical expedient and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the net plan assets available for benefits. 2 Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation. 3 Corporate stocks are diversified. Performance for actively managed separate accounts is primarily benchmarked against the Russell Indexes (40%) and Morgan Stanley Capital International (MSCI) index (60%), at both December 31, 2020 and 2019. 4 Corporate bonds are diversified. At December 31, 2020 and 2019, respectively, this category includes $54 million and $45 million for collateralized mortgage obligations and other asset backed securities. 5 At December 31, 2020 and 2019, respectively, the common/collective assets were invested in equity index funds that seek to track performance of the Standard and Poor's 500 Index (37% and 35%) and Russell 1000 indexes (13% and 17%). In addition, at December 31, 2020 and 2019, respectively, 40% and 28% of the assets in this category are in index funds which seek to track performance in the MSCI All Country World Index exUS and 8% and 12% of this category are in non-index U.S. equity fund, which is actively managed. 6 At December 31, 2020 and 2019, respectively, 49% and 51% are invested in private equity funds with investment strategies that include branded consumer products and clean technology companies, 23% and 17% are invested in ABS including distressed mortgages and commercial and residential loans, 4% and 8% are invested in a broad range of financial assets in all global markets. 19% are invested in publicly traded fixed income securities for both periods. 7 At both December 31, 2020 and 2019, other investment entities were invested in (1) emerging market equity securities and (2) domestic mortgage backed securities. 8 Level 1 registered investment companies primarily consisted of a global equity mutual fund which seeks to outperform the MSCI World Total Return Index. In addition, investments included fixed income fund used for cash management at December 31, 2020.
PBOP
Pension and Other Postretirement Benefits [Line Items]
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan	Information on PBOP Plan assets and benefit obligations is shown below: Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Change in benefit obligation Benefit obligation at beginning of year $ 2,083 $ 1,986 $ 2,074 $ 1,977 Service cost 38 30 37 30 Interest cost 63 77 63 77 Actuarial (gain) loss (46) 70 (45) 70 Plan participants' contributions 29 29 29 29 Benefits paid (94) (109) (94) (109) Benefit obligation at end of year $ 2,073 $ 2,083 $ 2,064 $ 2,074 Change in plan assets Fair value of plan assets at beginning of year $ 2,465 $ 2,133 $ 2,464 $ 2,133 Actual return on assets 309 401 309 401 Employer contributions 8 11 8 10 Plan participants' contributions 29 29 29 29 Benefits paid (94) (109) (93) (109) Fair value of plan assets at end of year 2,717 2,465 2,717 2,464 Funded status at end of year $ 644 $ 382 $ 653 $ 390 Amounts recognized in the consolidated balance sheets consist of: Long-term assets $ 663 $ 393 $ 663 $ 402 Current liabilities (10) (11) (10) (12) Long-term liabilities (9) — — — $ 644 $ 382 $ 653 $ 390 Amounts recognized in accumulated other comprehensive loss consist of: Net loss $ 1 $ 2 $ — $ — Amounts recognized as a regulatory liability (671) (416) (671) (416) Total not yet recognized as income $ (670) $ (414) $ (671) $ (416) Weighted average assumptions used to determine obligations at end of year: Discount rate 2.67 % 3.32 % 2.67 % 3.32 % Assumed health care cost trend rates: Rate assumed for following year 6.50 % 6.50 % 6.50 % 6.50 % Ultimate rate 5.00 % 5.00 % 5.00 % 5.00 % Year ultimate rate reached 2029 2029 2029 2029
Expense Components for Plans	Net periodic PBOP expense components for continuing operations are: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Service cost $ 38 $ 30 $ 37 $ 37 $ 30 $ 37 Non-service cost Interest cost 63 77 80 63 77 80 Expected return on plan assets (119) (111) (121) (119) (111) (122) Amortization of prior service credit (1) (1) (1) (1) (1) (1) Amortization of net gain (29) (17) — (29) (17) — Regulatory adjustment 49 29 24 49 29 24 Total non-service benefit (37) (23) (18) (37) (23) (19) Total expense $ 1 $ 7 $ 19 $ — $ 7 $ 18
Schedule of Assumptions Used	Edison International and SCE used the following weighted average assumptions to determine PBOP expense for continuing operations: Years ended December 31, 2020 2019 2018 Discount rate 3.32 % 4.35 % 3.70 % Expected long-term return on plan assets 4.90 % 5.30 % 5.30 % Assumed health care cost trend rates: Current year 6.50 % 6.75 % 6.75 % Ultimate rate 5.00 % 5.00 % 5.00 % Year ultimate rate reached 2029 2029 2029
Schedule of Expected Benefit Payments	The following benefit payments (net of plan participants' contributions) are expected to be paid: (in millions) Edison International SCE 2021 $ 83 $ 82 2022 84 84 2023 86 86 2024 89 88 2025 90 90 2026 – 2030 475 472
Postretirement Benefits Other than Pension Plan Assets by Hierarchy Levels	The following table sets forth the VEBA Trust assets for Edison International and SCE that were accounted for at fair value as of December 31, 2020 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 380 $ 30 $ — $ 410 Corporate stocks 3 224 3 — 227 Corporate notes and bonds 4 — 1,079 — 1,079 Common/collective funds 5 — — 693 693 Partnerships 6 — — 81 81 Registered investment companies 7 65 — — 65 Interest bearing cash — 26 — 26 Other 8 — 132 — 132 Total $ 669 $ 1,270 $ 774 $ 2,713 Receivables and payables, net 4 Combined net plan assets available for benefits 2,717 SCE's share of net plan assets $ 2,717 The following table sets forth the VEBA Trust assets for Edison International and SCE that were accounted for at fair value as of December 31, 2019 by asset class and level within the fair value hierarchy: (in millions) Level 1 Level 2 NAV 1 Total U.S. government and agency securities 2 $ 386 $ 63 $ — $ 449 Corporate stocks 3 242 2 — 244 Corporate notes and bonds 4 — 885 — 885 Common/collective funds 5 — — 652 652 Partnerships 6 — — 68 68 Registered investment companies 7 66 — — 66 Interest bearing cash — 17 — 17 Other 8 2 101 — 103 Total $ 696 $ 1,068 $ 720 $ 2,484 Receivables and payables, net (19) Combined net plan assets available for benefits 2,465 SCE's share of net plan assets $ 2,464 1 These investments are measured at fair value using the net asset value per share practical expedient and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the net plan assets available for benefits. 2 Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association. 3 Corporate stock performance for actively managed separate accounts is primarily benchmarked against the Russell Indexes (70% and 68%) and the MSCI All Country World Index (30% and 32%) for 2020 and 2019, respectively. 4 Corporate notes and bonds are diversified and include approximately $170 million and $49 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2020 and 2019, respectively. 5 At December 31, 2020 and 2019, respectively, 70% and 74% of the common/collective assets are invested in index funds which seek to track performance in the MSCI All Country World Index Investable Market Index. 22% and 19% are invested in a non-index U.S. equity fund which is actively managed. The remaining assets in this category are primarily invested in emerging market fund. 6 At December 31, 2020 and 2019, respectively, 46% and 55% of the partnerships are invested in private equity and venture capital funds. Investment strategies for these funds include branded consumer products, clean and information technology and healthcare. 36% and 28% of the remaining partnerships category are invested in asset backed securities including distressed mortgages, distressed companies and commercial and residential loans and debt and equity of banks. 18% and 15% are invested in a broad range of financial assets in all global markets. 7 At both December 31, 2020 and 2019, registered investment companies were primarily invested in a money market fund and exchange rate trade funds which seek to track performance of MSCI Emerging Market Index, Russell 2000 Index and international small cap equities. 8 Other includes $61 million and $66 million of municipal securities at December 31, 2020 and 2019, respectively.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2020
Regulated Entity, Other Assets, Noncurrent [Abstract]
Amortized Cost and Fair Value of the Trust Investments	The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments): Longest Amortized Cost Fair Value December 31, (in millions) 2020 2019 2020 2019 Stocks — N/A N/A $ 1,908 $ 1,765 Municipal bonds 2057 1,013 822 1,218 970 U.S. government and agency securities 2067 740 996 864 1,115 Corporate bonds 2070 460 597 550 679 Short-term investments and receivables/payables 1 One-year 281 32 293 33 Total $ 2,494 $ 2,447 $ 4,833 $ 4,562 1 Short-term investments include $138 million and $41 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2021 and January 2, 2020 as of December 31, 2020 and 2019, respectively.
Gains and (Losses) for Equity Securities	The following table summarizes the gains and losses for the trust investments: December 31, (in millions) 2020 2019 2018 Gross realized gains $ 255 $ 87 $ 134 Gross realized losses (6) (2) (27) Net unrealized gains (losses) for equity securities 176 343 (233)
Net Unrealized Gains and Losses for Equity Securities	The following table summarizes the gains and losses for the trust investments: December 31, (in millions) 2020 2019 2018 Gross realized gains $ 255 $ 87 $ 134 Gross realized losses (6) (2) (27) Net unrealized gains (losses) for equity securities 176 343 (233)

Regulatory Assets and Liabili_2

Regulatory Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Assets Included on the Consolidated Balance Sheets	SCE's regulatory assets included on the consolidated balance sheets are: December 31, (in millions) 2020 2019 Current: Regulatory balancing and memorandum accounts $ 1,127 $ 798 Power contracts 165 189 Other 22 22 Total current 1,314 1,009 Long-term: Deferred income taxes, net of liabilities 4,475 4,026 Pension and other postretirement benefits 12 87 Power contracts 239 434 Unamortized investments, net of accumulated amortization 1 114 119 Unamortized loss on reacquired debt 133 142 Regulatory balancing and memorandum accounts 1,794 981 Environmental remediation 247 237 Other 106 62 Total long-term 7,120 6,088 Total regulatory assets $ 8,434 $ 7,097 1 Relates to a regulatory asset that earns a rate of return. See below for further information.
Regulatory Liabilities Included on the Consolidated Balance Sheets	SCE's regulatory liabilities included on the consolidated balance sheets are: December 31, (in millions) 2020 2019 Current: Regulatory balancing and memorandum accounts $ 471 $ 883 Energy derivatives 87 80 Other 11 9 Total current 569 972 Long-term: Costs of removal 2,595 2,674 Re-measurement of deferred taxes 2,283 2,424 Recoveries in excess of ARO liabilities 1,930 1,569 Regulatory balancing and memorandum accounts 1,062 1,261 Other postretirement benefits 671 416 Other 48 41 Total long-term 8,589 8,385 Total regulatory liabilities $ 9,158 $ 9,357
Schedule of Regulatory Balancing Accounts	The following table summarizes the significant components of regulatory balancing and memorandum accounts included in the above tables of regulatory assets and liabilities: December 31, (in millions) 2020 2019 Asset (liability) Energy resource recovery account $ (89) $ (23) Portfolio allocation balancing account 497 537 New system generation balancing account (10) 85 Public purpose programs and energy efficiency programs (1,130) (1,244) Base revenue requirement balancing account 622 (328) Greenhouse gas auction revenue and low carbon fuel standard revenue (125) (196) FERC balancing accounts 12 (127) Wildfire and drought restoration accounts 1 361 120 Wildfire-related memorandum accounts 2 1,104 748 COVID-19-related memorandum accounts 3 176 — Other (30) 63 Asset (Liability) $ 1,388 $ (365) 1 The wildfire and drought restoration accounts regulatory assets represent restorative costs that are recorded in a Catastrophic Event Memorandum Account ("CEMA"). 2 The wildfire-related memorandum accounts regulatory assets represent wildfire-related costs that are probable of future recovery from customers, subject to a reasonableness review. The Fire Hazard Prevention Memorandum Account ("FHPMA") is used to track costs related to fire safety and to implement fire prevention corrective action measures in extreme and very high fire threat areas. The Wildfire Expense Memorandum Account ("WEMA") is used to track incremental wildfire insurance costs and uninsured wildfire-related financing, legal and claims costs. During 2019, the CPUC approved a Wildfire Mitigation Plan memorandum account to track costs incurred to implement SCE's Wildfire Mitigation Plan that are not currently reflected in SCE's revenue requirements, a Grid Safety and Resiliency Program Memorandum Account ("GSRPMA") to track the costs of SCE's GS&RP that are incremental to costs approved for recovery in SCE's 2018 GRC and a fire risk mitigation memorandum account to track costs related to the reduction of fire risk that are incremental to costs approved for recovery in SCE's 2018 GRC that are not tracked in any other wildfire-related memorandum account.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Schedule Of Commitments And Contingencies [Line Items]
Schedule of Contingency Accruals and Changes	The following table presents changes in estimated losses since December 31, 2019: (in millions) Loss estimate balance at December 31, 2019 $ 4,541 Increase in accrued estimated losses to reflect best estimate 1,297 Amounts paid (1,455) Loss estimate balance at December 31, 2020 1 4,383 1 At December 31, 2020, $2,231 million in current liabilities, wildfire-related claims, on Edison International's and SCE's consolidated balance sheets includes an estimate for claims brought by insurance subrogation plaintiffs in the Woolsey Fire litigation, which were subsequently settled on January 22, 2021 for $2,212 million, and $19 million of other settlements executed in connection with the 2017/2018 Wildfire/Mudslide Events. At December 31, 2020, the $2,281 million included in deferred credits and other liabilities, wildfire-related claims on Edison International's and SCE's consolidated balance sheets includes Edison International and SCE's best estimate of expected losses for remaining alleged and potential claims related to the 2017/2018 Wildfire/Mudslide Events after giving effect to the Woolsey Subrogation Settlement of $2,152 million and other wildfire-related claims estimates of $129 million. For the years-ended December 31, 2020 and 2019, Edison International's and SCE's consolidated statements of income include charges for the estimated losses, net of expected recoveries from insurance and FERC customers, related to the 2017/2018 Wildfire/Mudslide Events as follows: Year ended December 31, (in millions) 2020 2019 Charge for wildfire-related claims $ 1,297 $ 232 Expected revenue from FERC customers (84) (14) Total pre-tax charge 1,213 218 Income tax benefit (339) (61) Total after-tax charge $ 874 $ 157 (in millions) Balance at December 31, 2019 1 $ 1,710 Insurance recoveries (1,002) Balance at December 31, 2020 $ 708
SCE
Schedule Of Commitments And Contingencies [Line Items]
Summary of Undiscounted Future Expected Payments for Power Purchase Agreements That Have Been Approved by the CPUC and Have Completed Major Milestones for Construction	At December 31, 2020, the undiscounted future expected minimum payments for the SCE PPAs (primarily related to renewable energy contracts), which were approved by the CPUC and met other critical contract provisions (including completion of major milestones for construction), were as follows: (in millions) Total 2021 $ 3,144 2022 3,066 2023 2,937 2024 2,349 2025 2,236 Thereafter 21,756 Total future commitments 1 $ 35,488 1 Certain power purchase agreements are treated as operating or finance leases. For further discussion, see Note 13. Includes lease contracts commencing in 2021, 2022 and 2023 with future short-term lease expense of $242 million in 2021 and long-term minimum lease payments of $866 million.
Summary of Certain Future Other Commitments	The following summarizes the estimated minimum future commitments for SCE's other commitments: (in millions) 2021 2022 2023 2024 2025 Thereafter Total Other contractual obligations $ 46 $ 43 $ 43 $ 45 $ 37 $ 154 $ 368

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Summary of Finance Lease Payments	The following table summarizes SCE's lease payments for operating and finance leases as of December 31, 2020: (in millions) PPA Operating Leases 1 Other Operating Leases 2 PPA Finance Leases 1 2021 $ 204 $ 39 $ 1 2022 208 32 1 2023 159 26 1 2024 47 21 — 2025 47 18 — Thereafter 443 104 5 Total lease payments 1,108 240 8 Amount representing interest 3 203 60 4 Lease liabilities $ 905 $ 180 $ 4 1 Excludes expected purchases from most renewable energy contracts, which do not meet the definition of a lease payment since renewable power generation is contingent on external factors. 2 Excludes escalation clauses based on consumer price or other indices and residual value guarantees that are not considered probable at the commencement date of the lease. 3 Lease payments are discounted to their present value using SCE's incremental borrowing rates.
Summary of Operating Lease Payments	The following table summarizes SCE's lease payments for operating and finance leases as of December 31, 2020: (in millions) PPA Operating Leases 1 Other Operating Leases 2 PPA Finance Leases 1 2021 $ 204 $ 39 $ 1 2022 208 32 1 2023 159 26 1 2024 47 21 — 2025 47 18 — Thereafter 443 104 5 Total lease payments 1,108 240 8 Amount representing interest 3 203 60 4 Lease liabilities $ 905 $ 180 $ 4 1 Excludes expected purchases from most renewable energy contracts, which do not meet the definition of a lease payment since renewable power generation is contingent on external factors. 2 Excludes escalation clauses based on consumer price or other indices and residual value guarantees that are not considered probable at the commencement date of the lease. 3 Lease payments are discounted to their present value using SCE's incremental borrowing rates.
Supplemental Balance Sheet Information	Supplemental balance sheet information related to SCE's leases was as follows: (in millions) December 31, 2020 December 31, 2019 Operating leases: Operating lease ROU assets 1 $ 1,085 $ 689 Current portion of operating lease liabilities 214 79 Operating lease liabilities 871 610 Total operating lease liabilities 1 $ 1,085 $ 689 Finance leases included in: Utility property, plant and equipment, gross $ 4 $ 14 Accumulated depreciation — (5) Utility property, plant and equipment, net 4 9 Other current liabilities — 1 Other long-term liabilities 4 8 Total finance lease liabilities $ 4 $ 9
Summary of Lease Expense Components	The following table summarizes the components of SCE's lease expense: (in millions) Year ended December 31, 2020 Year ended December 31, 2019 PPA leases: Operating lease cost $ 111 $ 118 Finance lease cost 1 1 Variable lease cost 1 1,917 2,087 Total PPA lease cost 2,029 2,206 Other operating leases cost 47 46 Total lease cost $ 2,076 $ 2,252 1 Includes lease costs from renewable energy contracts where payments are based on contingent external factors such as wind, hydro and solar power generation. Other information related to leases was as follows: (in millions, except lease term and discount rate) Year ended December 31, 2020 Year ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases PPA leases $ 111 $ 118 Other leases 44 44 Financing cash flows from PPA finance leases 1 1 ROU assets obtained in exchange for lease obligations: PPA operating leases $ 463 — Other operating leases 58 34 Weighted average remaining lease term (in years): Operating leases PPA leases 9.75 16.05 Other leases 12.13 12.73 PPA Finance leases 16.67 11.51 Weighted average discount rate: Operating leases PPA leases 3.12 % 4.46 % Other leases 3.63 % 3.88 % PPA Finance leases 11.29 % 8.76 %
Schedule of Undiscounted Cash Flow Expected from Lease Payments	At December 31, 2020, the undiscounted cash flow expected to be received from lease payments for the remaining years is as follows: (in millions) 2021 $ 11 2022 10 2023 8 2024 7 2025 6 Thereafter 128 Total $ 170

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Schedule of Preferred Stock and Preference Stock	In 2020, Edison International Parent made the following equity contributions to SCE: Date of contribution Amounts (in millions) February 28, 2020 $ 269 April 29, 2020 200 May 26, 2020 319 June 30, 2020 100 August 31, 2020 219 December 18, 2020 325 Total $ 1,432 Preferred stock and preference stock are: Shares Redemption Dividends Declared per Share December 31, (in millions, except shares and per share amounts) 2020 2019 Cumulative preferred stock $25 par value: 4.08% Series — $ 25.50 $ 0.757 $ — $ 16 4.24% Series — 25.80 0.786 — 30 4.32% Series — 28.75 0.801 — 41 4.78% Series — 25.80 0.886 — 33 Preference stock No par value: 6.25% Series E (cumulative) 350,000 1,000.00 62.500 350 350 5.10% Series G (cumulative) 88,004 2,500.00 127.500 220 400 5.75% Series H (cumulative) 110,004 2,500.00 143.750 275 275 5.375% Series J (cumulative) 130,004 2,500.00 134.375 325 325 5.45% Series K (cumulative) 120,004 2,500.00 136.250 300 300 5.00% Series L (cumulative) 190,004 2,500.00 125.000 475 475 SCE's preferred and preference stock 1,945 2,245 Less issuance costs (44) (52) Edison International's preferred and preference stock of utility $ 1,901 $ 2,193

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	The changes in accumulated other comprehensive loss, net of tax, consist of: Edison International SCE Years ended December 31, (in millions) 2020 2019 2020 2019 Beginning balance $ (69) $ (50) $ (39) $ (23) Pension and PBOP – net loss: Other comprehensive loss before reclassifications (8) (14) (7) (14) Reclassified from accumulated other comprehensive loss 1 8 5 5 3 Other 2 — (10) — (5) Change — (19) (2) (16) Ending balance $ (69) $ (69) $ (41) $ (39) 1 These items are included in the computation of net periodic pension and PBOP expenses. See Note 9 for additional information.

Other Income (Tables)

Other Income (Tables)	12 Months Ended
	Dec. 31, 2020
Other Income and Expenses [Abstract]
Summary of Other Income and Expenses	Other income net of expenses is as follows: Years ended December 31, (in millions) 2020 2019 2018 SCE other income and (expenses): Equity allowance for funds used during construction $ 121 $ 101 $ 104 Increase in cash surrender value of life insurance policies and life insurance benefits 66 39 36 Interest income 20 37 24 Net periodic benefit income – non-service components 102 70 81 Civic, political and related activities and donations (42) (46) (44) Other (12) (6) (7) Total SCE other income 255 195 194 Other income of Edison International Parent and Other: Net periodic benefit costs – non-service components (2) (3) (2) Other (2) 1 5 Total Edison International other income $ 251 $ 193 $ 197

Supplemental Cash Flows Infor_2

Supplemental Cash Flows Information (Tables)	12 Months Ended
	Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flows Information	Supplemental cash flows information is: Edison International SCE Years ended December 31, (in millions) 2020 2019 2018 2020 2019 2018 Cash payments (receipts): Interest, net of amounts capitalized $ 836 $ 705 $ 595 $ 713 $ 615 $ 552 Income taxes, net (34) (85) (135) (50) (164) (57) Non-cash financing and investing activities: Dividends declared but not paid: Common stock 251 231 200 — 200 — Preferred and preference stock 11 12 12 11 12 12

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Schedule of Related-Party Transactions	The related-party transactions included in SCE's consolidated balance sheets for wildfire-related insurance purchased from EIS and related expected insurance recoveries were as follows: December 31, (in millions) 2020 2019 Current insurance receivable due from affiliate $ 268 $ — Long-term insurance receivables due from affiliate — 803 Prepaid insurance 1 56 10 1

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data	Edison International's quarterly financial data is as follows: 2020 (in millions, except per share amounts) Fourth Third Second First Operating revenue $ 3,157 $ 4,644 $ 2,987 $ 2,790 Operating income (loss) 794 (379) 500 302 Net income (loss) 552 (242) 348 213 Net income (loss) attributable to common shareholders 526 (288) 318 183 Basic earnings (loss) per share: $ 1.39 $ (0.76) $ 0.85 $ 0.50 Diluted earnings (loss) per share: $ 1.39 $ (0.76) $ 0.85 $ 0.50 Dividends declared per share 0.6625 0.6375 0.6375 0.6375 2019 (in millions, except per share amounts) Fourth Third Second First Operating revenue $ 2,970 $ 3,741 $ 2,812 $ 2,824 Operating income 287 636 500 352 Net income 173 502 422 308 Net income attributable to common shareholders 143 471 392 278 Basic earnings per share: $ 0.40 $ 1.36 $ 1.20 $ 0.85 Diluted earnings per share: $ 0.40 $ 1.35 $ 1.20 $ 0.85 Dividends declared per share 0.6375 0.6125 0.6125 0.6125 SCE's quarterly financial data is as follows: 2020 (in millions) Fourth Third Second First Operating revenue $ 3,151 $ 4,635 $ 2,980 $ 2,780 Operating income (loss) 678 (364) 548 316 Net income (loss) 500 (218) 411 249 Net income (loss) available for common stock 474 (264) 381 219 Common dividends declared 325 269 269 269 2019 (in millions) Fourth Third Second First Operating revenue $ 2,958 $ 3,732 $ 2,800 $ 2,816 Operating income 325 649 513 358 Net income 224 534 449 323 Net income available for common stock 194 503 419 293 Common dividends declared 200 200 — 200

Schedule I - Condensed Financ_2

Schedule I - Condensed Financial Information of Parent (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Summary for Status of Credit Facilities	The following table summarizes the status of the credit facilities at December 31, 2020: (in millions, except for rates) Execution date Termination date LIBOR plus (bps) Use of proceeds Commitment Outstanding borrowings Outstanding letters of credit Amount available Edison International Parent June 2019 May 2024 128 Support commercial paper borrowings and general corporate purposes 1, 4 $ 1,500 $ 130 $ — $ 1370 Total Edison International Parent: $ 1,500 $ 130 $ — $ 1,370 SCE March 2020 March 2021 65 Finance a portion of the AB 1054 Capital Expenditures 2 $ 800 $ 495 $ — $ 305 May 2020 May 2021 150 Undercollections related to COVID-19 and general corporate purposes 1,500 — — 1,500 June 2019 May 2024 108 Support commercial paper borrowings and general corporate purposes 3, 4 3,000 725 159 2,116 Total SCE: $ 5,300 $ 1,220 $ 159 $ 3,921 Total Edison International: $ 6,800 $ 1,350 $ 159 $ 5,291 1 At December 31, 2020 Edison International Parent had $130 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.42%. At December 31, 2019 Edison International Parent did not have any outstanding commercial paper. 2 This credit facility may be extended for two 364-day periods, at the lenders' discretion. The aggregate maximum principal amount may be increased up to $1.1 billion provided that additional lender commitments are obtained. 3 At December 31, 2020 and December 31, 2019, SCE had $725 million and $550 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.43% and 2.24%, respectively. As of December 31, 2020, $324 million outstanding commercial paper was classified as long-term debt due to subsequent refinancing. See "Debt Financing Subsequent to December 31, 2020" for more information. 4 The aggregate maximum principal amount under the SCE and Edison International Parent revolving credit facilities may be increased up to $4.0 billion and $2.0 billion, respectively, provided that additional lender commitments are obtained. The following table summarizes the status of the credit facility at December 31, 2020: (in millions) Commitment $ 1,500 Outstanding borrowings 1 130 Amount available $ 1,370 1 At December 31, 2020 Edison International Parent had $130 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 0.42%. At December 31, 2019 Edison International Parent did not have any outstanding commercial paper.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Organization and Basis of Presentation) (Details) mi² in Thousands	12 Months Ended
	Dec. 31, 2020mi²
Electric Utility | SCE
Segment Reporting Information [Line Items]
Supply of electricity area covered (in square miles)	50

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Money market funds	$ 62	$ 31
Book balances reclassified to accounts payable	69	75
Cash and cash equivalents	87	68
Short-term restricted cash	2	2
Total cash, cash equivalents, and restricted cash	89	70	$ 152	$ 1,132
SCE
Restricted Cash and Cash Equivalents Items [Line Items]
Money market funds	38	0
Book balances reclassified to accounts payable	69	74
Cash and cash equivalents	55	24
Short-term restricted cash	1	0
Total cash, cash equivalents, and restricted cash	$ 56	$ 24	$ 22	$ 515

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Changes in Allowance for Uncollectible Accounts) (Details) - SCE $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 35
Included in operation and maintenance expenses	36
Deferred to regulatory assets	120
Less: write-offs, net of recoveries	16
Ending balance	175
All others
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14
Included in operation and maintenance expenses	9
Deferred to regulatory assets	0
Less: write-offs, net of recoveries	10
Ending balance	$ 13

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Emission Allowances and Energy Credits) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
LCFS net sales proceeds
Significant Accounting Policies [Line Items]
Regulatory liabilities	$ 176	$ 184
SCE
Significant Accounting Policies [Line Items]
Regulatory liabilities	9,158	9,357
SCE | Other current assets
Significant Accounting Policies [Line Items]
GHG allowances	78	50
SCE | Other current liabilities
Significant Accounting Policies [Line Items]
GHG emission obligations	$ 64	$ 50

Summary of Significant Accoun_8

Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation	$ 1,800	$ 1,700	$ 1,700
Depreciation expense stated as a percent of average original cost of depreciable utility plant (as a percent)	3.60%	3.60%	3.70%
AFUDC equity capitalized during construction	$ 121	$ 101	$ 104
Interest and other income
Property, Plant and Equipment [Line Items]
AFUDC equity capitalized during construction	121	101	104
Interest expense
Property, Plant and Equipment [Line Items]
AFUDC debt capitalized during construction	$ 53	$ 63	$ 44
Generation plant
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives	36 years
Distribution plant
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives	48 years
Transmission plant
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives	54 years
General plant and other
Property, Plant and Equipment [Line Items]
Weighted Average Useful Lives	25 years
Minimum | Generation plant
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years
Minimum | Distribution plant
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	20 years
Minimum | Transmission plant
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	45 years
Minimum | General plant and other
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum | Generation plant
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	55 years
Maximum | Distribution plant
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	65 years
Maximum | Transmission plant
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	65 years
Maximum | General plant and other
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	60 years

Summary of Significant Accoun_9

Summary of Significant Accounting Policies (Prepaid Insurance) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Redeemable Noncontrolling Interest [Line Items]
Wildfire Insurance Fund contributions long term			$ 2,400	$ 2,800
Wildfire Insurance Fund contributions current			323	323
Wildfire Insurance Fund contributions			95	2,457	$ 0
Insurance fund liability included in other long-term liabilities			$ 703	785
Amortization period			10 years
Subsequent event
Redeemable Noncontrolling Interest [Line Items]
Amortization period	15 years
Measurement Input
Redeemable Noncontrolling Interest [Line Items]
Historical term used in estimate			5 years
Measurement Input | Subsequent event
Redeemable Noncontrolling Interest [Line Items]
Historical term used in estimate	7 years
SCE
Redeemable Noncontrolling Interest [Line Items]
Wildfire Insurance Fund contributions long term			$ 2,400	2,800
Wildfire Insurance Fund contributions current			323	323
Wildfire Insurance Fund contributions		$ 2,400	95	2,457	$ 0
Insurance fund liability included in other long-term liabilities			$ 703	$ 785
Amortization period			10 years

Summary of Significant Accou_10

Summary of Significant Accounting Policies (Goodwill) (Details) - Edison Energy Group - USD ($)	3 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Goodwill [Line Items]
Goodwill impairment	$ 34,000,000	$ 25,000,000	$ 19,000,000
Goodwill impairment after-tax	$ 25,000,000	18,000,000	$ 13,000,000
Goodwill		$ 34,000,000		$ 0

Summary of Significant Accou_11

Summary of Significant Accounting Policies (Nuclear Decommissioning and Asset Retirement Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward
Beginning balance	$ 3,029
Ending balance	2,930	$ 3,029
SCE
Asset Retirement Obligation, Roll Forward
Beginning balance	3,029	3,031
Accretion	160	166
Revisions	(36)	4
Liabilities settled	(223)	(172)
Ending balance	2,930	$ 3,029
SCE | Palo Verde and San Onofre Units
Asset Retirement Obligation, Roll Forward
Recorded liability to decommission nuclear power facilities	2,600
Estimated cost to decommission nuclear facilities	$ 6,600
Decommissioning cost escalated rates, low end (percent)	0.60%
Decommissioning cost escalated rates, high end (as a percent)	7.50%
Estimated annual net of tax earnings, low end (as a percent)	1.30%
Estimated annual net of tax earnings, high end (as a percent)	4.10%

Summary of Significant Accou_12

Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory assets	$ 7,120	$ 6,088
Amortization of deferred financing costs charged to interest expense	32	30	$ 30
Long-term debt
Regulatory Assets [Line Items]
Unamortized debt issuance expense	131	121
SCE
Regulatory Assets [Line Items]
Regulatory assets	7,120	6,088
Amortization of deferred financing costs charged to interest expense	27	26	$ 26
SCE | Long-term debt
Regulatory Assets [Line Items]
Unamortized debt issuance expense	117	106
SCE | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	$ 133	$ 142

Summary of Significant Accou_13

Summary of Significant Accounting Policies (Revenue Recognition) (Details) - SCE - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2020	Jul. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Public Utilities, General Disclosures [Line Items]
Franchise fees billed to customers			$ 131	$ 122	$ 133
Rate recovery period			24 months
CPUC
Public Utilities, General Disclosures [Line Items]
Requested increase rate amount	$ 214	$ 505
CPUC | 2018 GRC
Public Utilities, General Disclosures [Line Items]
Impact of decision non-core impairment of utility core earnings, net of tax				65
Reduction in authorized revenue				289
Impact of decision non-core impairment of utility property, plant and equipment				170
Impact of decision non-core impairment of utility property, plant and equipment, net of tax				$ 123
Requested increase rate amount	$ 204	$ 478
CPUC | 2021 GRC
Public Utilities, General Disclosures [Line Items]
Requested test year revenue requirement			$ 7,600
Requested increase rate amount			$ 1,300

Summary of Significant Accou_14

Summary of Significant Accounting Policies (SCE Dividends) (Details) - SCE - USD ($) $ in Millions	Feb. 25, 2021	Jan. 01, 2020	May 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)		52.00%		48.00%	45.20%
Notification threshold, percent			1.00%
Wildfire related charge incurred after tax					$ 1,800
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)				37 months
Weighted-average common equity component of total capitalization percent with CPUC waiver					48.70%
Waiver threshold percent (as a percent)					47.70%
Subsequent event
Significant Accounting Policies [Line Items]
Dividends	$ 325

Summary of Significant Accou_15

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings (loss) per share – continuing operations:
Income (loss) from continuing operations attributable to common shareholders	$ 739	$ 1,284	$ (457)
Participating securities dividends	0	0	0
Income (loss) from continuing operations available to common shareholders	$ 739	$ 1,284	$ (457)
Weighted-average shares of common stock outstanding (in shares)	373,000,000	340,000,000	326,000,000
Continuing operations (in dollars per share)	$ 1.98	$ 3.78	$ (1.40)
Diluted earnings (loss) per share – continuing operations:
Income (loss) from continuing operations attributable to common shareholders	$ 739	$ 1,284	$ (457)
Participating securities dividends	0	0	0
Income (loss) from continuing operations available to common shareholders	739	1,284	(457)
Income impact of assumed conversions	0	0	0
Income (loss) from continuing operations available to common shareholders and assumed conversions	$ 739	$ 1,284	$ (457)
Weighted average common shares outstanding (in shares)	373,000,000	340,000,000	326,000,000
Incremental shares from assumed conversions (in shares)	1,000,000	1,000,000	0
Adjusted weighted average shares – diluted (in shares)	374,000,000	341,000,000	326,000,000
Diluted (loss) earnings per share – continuing operations (in dollars per share)	$ 1.98	$ 3.77	$ (1.40)
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock option awards excluded from earnings per share, number of shares	9,066,753	4,511,802	8,852,706

Summary of Significant Accou_16

Summary of Significant Accounting Policies (Subsequent Events) (Details) - Subsequent event - Senior notes - Recovery bonds - SCE Recovery Funding LLC $ in Millions	Feb. 25, 2021USD ($)
Subsequent Event [Line Items]
Debt, face amount	$ 338
Due 2033
Subsequent Event [Line Items]
Debt, face amount	$ 138
Interest rate on debt (as a percent)	0.86%
Due 2040
Subsequent Event [Line Items]
Debt, face amount	$ 100
Interest rate on debt (as a percent)	1.94%
Due 2045
Subsequent Event [Line Items]
Debt, face amount	$ 100
Interest rate on debt (as a percent)	2.51%

Property, Plant and Equipment_2

Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (10,681)	$ (9,958)
Total utility property, plant and equipment	47,653	44,198
SCE
Property, Plant and Equipment [Line Items]
Distribution	28,663	26,929
Transmission	15,669	14,720
Generation	3,709	3,664
General plant and other	5,129	4,583
Accumulated depreciation	(10,681)	(9,958)
Total utility property, plant and equipment, Gross	42,489	39,938
Construction work in progress	5,033	4,131
Nuclear fuel, at amortized cost	131	129
Total utility property, plant and equipment	$ 47,653	$ 44,198

Property, Plant and Equipment_3

Property, Plant and Equipment (Textual) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 1,200	$ 1,000
Capitalized software, accumulated amortization	600	400
Capitalized software, amortization expense	218	$ 190	$ 198
Capitalized software, estimated amortization year 1	213
Capitalized software, estimated amortization year 2	168
Capitalized software, estimated amortization year 3	136
Capitalized software, estimated amortization year 4	82
Capitalized software, estimated amortization year 5	$ 30
Capitalized software costs | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Capitalized software costs | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years

Property, Plant and Equipment_4

Property, Plant and Equipment (Jointly Owned Utility Projects) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Jointly Owned Utility Plant Interests [Line Items]
Nuclear Fuel (at amortized cost)	$ 131	$ 129
Eldorado
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	324
Construction Work in Progress	74
Accumulated Depreciation	39
Nuclear Fuel (at amortized cost)	0
Net Book Value	$ 359
Ownership Interest	79.00%
Pacific Intertie
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 346
Construction Work in Progress	0
Accumulated Depreciation	74
Nuclear Fuel (at amortized cost)	0
Net Book Value	$ 272
Ownership Interest	50.00%
Palo Verde (nuclear)
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 2,113
Construction Work in Progress	53
Accumulated Depreciation	1,609
Nuclear Fuel (at amortized cost)	131
Net Book Value	$ 688
Ownership Interest	16.00%
Total
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 2,783
Construction Work in Progress	127
Accumulated Depreciation	1,722
Nuclear Fuel (at amortized cost)	131
Net Book Value	$ 1,319

Variable Interest Entities (Var

Variable Interest Entities (Variable Interest in VIEs that are not Consolidated) (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)MW	Dec. 31, 2019USD ($)MW	Dec. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / shares	Dec. 31, 2014USD ($)$ / shares	Dec. 31, 2013USD ($)$ / shares
Unconsolidated Trust
Redemption of preferred and preference stock			$ 308,000,000
SCE
Unconsolidated Trust
Redemption of preferred and preference stock		$ 120,000,000	$ 308,000,000
SCE | 5.10% Series G (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)			5.10%
SCE | 5.75% Series H (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)			5.75%
SCE | 5.375% Series J (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)			5.375%
SCE | 5.45% Series K (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)			5.45%
SCE | 5.00% Series L (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)			5.00%
SCE | VIE | Power Purchase Agreements
Details of projects or entities
Power generating capacity for majority interest (in megawatts) | MW			5,103	4,497
Payments to unconsolidated VIEs for power purchase contracts			$ 744,000,000	$ 833,000,000
SCE | VIE | Trust II | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)									5.10%
Liquidation preference			220,000,000	400,000,000					$ 400,000,000
Liquidation value (in dollars per share) | $ / shares									$ 25
Common stock									$ 10,000
SCE | VIE | Trust II | 5.10% Series G (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)									5.10%
Liquidation preference			220,000,000	400,000,000					$ 400,000,000
Liquidation value (in dollars per share) | $ / shares									$ 2,500
Redemption of preferred and preference stock	$ 180,000,000
SCE | VIE | Trust III | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)								5.75%
Liquidation preference			275,000,000	275,000,000				$ 275,000,000
Liquidation value (in dollars per share) | $ / shares								$ 25
Common stock								$ 10,000
Redemption of preferred and preference stock			10,000	10,000
SCE | VIE | Trust III | 5.75% Series H (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)								5.75%
Liquidation preference			275,000,000	275,000,000				$ 275,000,000
Liquidation value (in dollars per share) | $ / shares								$ 2,500
SCE | VIE | Trust IV | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)							5.375%
Liquidation preference			325,000,000	325,000,000			$ 325,000,000
Liquidation value (in dollars per share) | $ / shares							$ 25
Common stock							$ 10,000
Redemption of preferred and preference stock			10,000	10,000
SCE | VIE | Trust IV | 5.375% Series J (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)							5.375%
Liquidation preference			325,000,000	325,000,000			$ 325,000,000
Liquidation value (in dollars per share) | $ / shares							$ 2,500
SCE | VIE | Trust V | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)						5.45%
Liquidation preference			300,000,000	300,000,000		$ 300,000,000
Liquidation value (in dollars per share) | $ / shares						$ 25
Common stock						$ 10,000
Redemption of preferred and preference stock			10,000	10,000
SCE | VIE | Trust V | 5.45% Series K (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)						5.45%
Liquidation preference			300,000,000	300,000,000		$ 300,000,000
Liquidation value (in dollars per share) | $ / shares						$ 2,500
SCE | VIE | Trust VI | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)					5.00%
Liquidation preference			475,000,000	475,000,000	$ 475,000,000
Liquidation value (in dollars per share) | $ / shares					$ 25
Common stock					$ 10,000
Redemption of preferred and preference stock			10,000	10,000
SCE | VIE | Trust VI | 5.00% Series L (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)					5.00%
Liquidation preference			$ 475,000,000	$ 475,000,000	$ 475,000,000
Liquidation value (in dollars per share) | $ / shares					$ 2,500

Variable Interest Entities (Sum

Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - SCE - VIE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trust II
Variable Interest Entity [Line Items]
Dividend income	$ 20	$ 20	$ 20
Dividend distributions	20	20	20
Trust III
Variable Interest Entity [Line Items]
Dividend income	16	16	16
Dividend distributions	16	16	16
Trust IV
Variable Interest Entity [Line Items]
Dividend income	17	17	17
Dividend distributions	17	17	17
Trust V
Variable Interest Entity [Line Items]
Dividend income	16	16	16
Dividend distributions	16	16	16
Trust VI
Variable Interest Entity [Line Items]
Dividend income	24	24	24
Dividend distributions	$ 24	$ 24	$ 24

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets at fair value
Nuclear decommissioning trusts	$ 4,833	$ 4,562
SCE
Assets at fair value
Nuclear decommissioning trusts	$ 4,833	$ 4,562
Liabilities at fair value
Percentage of equity investments located in the United States (as a percent)	71.00%	72.00%
Collateralized mortgage obligations and other asset backed securities	$ 29	$ 46
Payables, net, related to investments	(206)	(111)
SCE | Fair Value, Measurements, Recurring
Assets at fair value
Netting and Collateral	(18)	(15)
Derivative contracts, net	108	87
Other	62	18
Nuclear decommissioning trusts	5,039	4,673
Total assets	5,209	4,778
Liabilities at fair value
Netting and Collateral	(22)	(15)
Derivative contracts, net	0	1
Total liabilities	0	1
Net assets	5,209	4,777
Cash collateral posted	4	0
SCE | Fair Value, Measurements, Recurring | Level 1
Assets at fair value
Derivative contracts	0	0
Other	39	4
Nuclear decommissioning trusts	2,874	2,601
Total assets	2,913	2,605
Liabilities at fair value
Derivative contracts	0	0
Total liabilities	0	0
Net assets	2,913	2,605
SCE | Fair Value, Measurements, Recurring | Level 2
Assets at fair value
Derivative contracts	6	19
Other	23	14
Nuclear decommissioning trusts	2,165	2,072
Total assets	2,194	2,105
Liabilities at fair value
Derivative contracts	10	11
Total liabilities	10	11
Net assets	2,184	2,094
SCE | Fair Value, Measurements, Recurring | Level 3
Assets at fair value
Derivative contracts	120	83
Other	0	0
Nuclear decommissioning trusts	0	0
Total assets	120	83
Liabilities at fair value
Derivative contracts	12	5
Total liabilities	12	5
Net assets	108	78
SCE | Fair Value, Measurements, Recurring | Stocks
Assets at fair value
Nuclear decommissioning trusts	1,908	1,765
SCE | Fair Value, Measurements, Recurring | Stocks | Level 1
Assets at fair value
Nuclear decommissioning trusts	1,908	1,765
SCE | Fair Value, Measurements, Recurring | Stocks | Level 2
Assets at fair value
Nuclear decommissioning trusts	0	0
SCE | Fair Value, Measurements, Recurring | Stocks | Level 3
Assets at fair value
Nuclear decommissioning trusts	0	0
SCE | Fair Value, Measurements, Recurring | Fixed Income
Assets at fair value
Nuclear decommissioning trusts	2,632	2,762
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 1
Assets at fair value
Nuclear decommissioning trusts	519	738
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 2
Assets at fair value
Nuclear decommissioning trusts	2,113	2,024
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 3
Assets at fair value
Nuclear decommissioning trusts	0	0
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	499	146
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 1
Assets at fair value
Nuclear decommissioning trusts	447	98
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 2
Assets at fair value
Nuclear decommissioning trusts	52	48
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 3
Assets at fair value
Nuclear decommissioning trusts	$ 0	$ 0

Fair Value Measurements (Textua

Fair Value Measurements (Textual) (Details) - USD ($)	3 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		$ 31,000,000		$ 62,000,000
Edison Energy Group
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment	$ 34,000,000	25,000,000	$ 19,000,000
Goodwill impairment after-tax	$ 25,000,000	18,000,000	$ 13,000,000
Edison International Parent and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0
Edison International Parent and Other | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		$ 31,000,000		24,000,000
Edison International Parent and Other | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments				$ 5,000,000

Fair Value Measurements (Level

Fair Value Measurements (Level 3 Rollforward) (Details) - SCE - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures Level 3 [Roll Forward]
Fair value of net assets at beginning of period	$ 78	$ 141
Purchases	8	6
Sales	(5)	(5)
Settlements	(117)	(60)
Total realized/unrealized gains (losses)	144	(4)
Fair value of net assets at end of period	$ 108	$ 78

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - SCE - Level 3 - Congestion revenue rights - Auction prices $ in Millions	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Quantitative Information About Level 3 Measurements [Line Items]
Fair Value, Assets	$ 120	$ 83
Fair Value, Liabilities	$ 12	$ 5
CAISO CRR auction clearing prices | Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	(9.67)	(3.59)
CAISO CRR auction clearing prices | Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	300.47	25.32
CAISO CRR auction clearing prices | Weighted Average (per MWh)
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	2.75	1.97

Fair Value Measurements (Fair_2

Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 20,337	$ 18,343
Fair Value	23,824	20,137
SCE
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	17,204	15,211
Fair Value	$ 20,365	$ 16,892

Debt and Credit Agreements (Lon

Debt and Credit Agreements (Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current portion of long-term debt	$ (1,029)	$ (479)
Long-term debt	19,632	17,864
Edison International Parent and Other
Debt Instrument [Line Items]
Current portion of long-term debt	0	(400)
Unamortized debt discount/premium and issuance costs, net	(17)	(18)
Long-term debt	3,133	2,732
Edison International Parent and Other | Debentures and notes
Debt Instrument [Line Items]
Long-term debt	$ 3,150	3,150
Edison International Parent and Other | Debentures and notes | Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	2.40%
Edison International Parent and Other | Debentures and notes | Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	5.75%
SCE
Debt Instrument [Line Items]
Other long-term debt	$ 324	0
Current portion of long-term debt	(1,029)	(79)
Unamortized debt discount/premium and issuance costs, net	(80)	(119)
Long-term debt	16,499	15,132
SCE | Debentures and notes
Debt Instrument [Line Items]
Long-term debt	$ 306	306
SCE | Debentures and notes | Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	0.0506%
SCE | Debentures and notes | Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	0.0665%
SCE | First and refunding mortgage bonds
Debt Instrument [Line Items]
Long-term debt	$ 16,843	14,272
SCE | First and refunding mortgage bonds | Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	0.012%
SCE | First and refunding mortgage bonds | Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	0.0605%
SCE | Pollution-control bonds
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	0.0263%
Long-term debt	$ 135	$ 752

Debt and Credit Agreements (L_2

Debt and Credit Agreements (Long-term Debt Maturities) (Details) $ in Millions	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
2021	$ 1,029
2022	1,064
2023	1,435
2024	500
2025	1,300
SCE
Debt Instrument [Line Items]
2021	1,029
2022	364
2023	1,035
2024	0
2025	$ 900

Debt and Credit Agreements (Tex

Debt and Credit Agreements (Textual) (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Jan. 31, 2021USD ($)
Debt Instrument [Line Items]
Debt covenant capitalization ratio		0.70
Actual debt to capitalization ratio		0.59
SCE
Debt Instrument [Line Items]
Debt covenant capitalization ratio		0.65
Actual debt to capitalization ratio		0.51
SCE | Mortgages
Debt Instrument [Line Items]
Debt, face amount		$ 900,000,000
SCE | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate		0.27%
SCE | March 2020 term loan agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Drawn against the revolving credit facility	$ 800,000,000
SCE | March 2020 term loan agreement | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%	0.65%
SCE | 2.95% First and Refunding Mortgage Bonds Due in 2051 | Mortgages | Subsequent event
Debt Instrument [Line Items]
Debt, face amount			$ 750,000,000
Interest rate on debt (as a percent)			2.95%
SCE | 2.25% First and Refunding Mortgage Bonds Due in 2030 | Mortgages | Subsequent event
Debt Instrument [Line Items]
Debt, face amount			$ 150,000,000
Interest rate on debt (as a percent)			2.25%

Debt and Credit Agreements (Sum

Debt and Credit Agreements (Summary for Status of Credit Facilities) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Revolving Credit Facility
Line of Credit Facility [Line Items]
Commitment		$ 6,800,000,000
Outstanding borrowings		1,350,000,000
Outstanding letters of credit		159,000,000
Amount available		5,291,000,000
Revolving Credit Facility | Multi-year credit facilities
Line of Credit Facility [Line Items]
Outstanding borrowings (excluding discount)		2,000,000,000
SCE | Multi-year credit facilities
Line of Credit Facility [Line Items]
Commitment		3,000,000,000
Outstanding borrowings		725,000,000
Outstanding letters of credit		159,000,000
Amount available		$ 2,116,000,000
SCE | Multi-year credit facilities | Commercial paper
Line of Credit Facility [Line Items]
Outstanding borrowings			$ 550,000,000
Weighted average interest rate (as a percent)		0.43%	2.24%
SCE | Multi-year credit facilities | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.08%
SCE | Revolving Credit Facility
Line of Credit Facility [Line Items]
Commitment		$ 5,300,000,000
Outstanding borrowings		1,220,000,000
Outstanding letters of credit		159,000,000
Amount available		3,921,000,000
SCE | Revolving Credit Facility | Multi-year credit facilities
Line of Credit Facility [Line Items]
Outstanding borrowings (excluding discount)		4,000,000,000
SCE | Revolving Credit Facility | March 2020 term loan agreement
Line of Credit Facility [Line Items]
Commitment		800,000,000
Outstanding borrowings		495,000,000
Outstanding letters of credit		0
Amount available		305,000,000
Outstanding borrowings (excluding discount)		$ 1,100,000,000
SCE | Revolving Credit Facility | March 2020 term loan agreement | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.125%	0.65%
SCE | Revolving Credit Facility | May 2020 Credit Agreement
Line of Credit Facility [Line Items]
Commitment		$ 1,500,000,000
Outstanding borrowings		0
Outstanding letters of credit		0
Amount available		$ 1,500,000,000
SCE | Revolving Credit Facility | May 2020 Credit Agreement | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.50%
Edison International | Revolving Credit Facility
Line of Credit Facility [Line Items]
Commitment		$ 1,500,000,000
Outstanding borrowings		130,000,000
Outstanding letters of credit		0
Amount available		1,370,000,000
Edison International | Revolving Credit Facility | Multi-year credit facilities
Line of Credit Facility [Line Items]
Commitment		1,500,000,000
Outstanding borrowings		130,000,000
Outstanding letters of credit		0
Amount available		$ 1,370,000,000
Weighted average interest rate (as a percent)		0.42%
Edison International | Revolving Credit Facility | Multi-year credit facilities | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.28%
Edison International Parent and Other | Multi-year credit facilities
Line of Credit Facility [Line Items]
Outstanding borrowings			$ 0

Debt and Credit Agreements (Ter

Debt and Credit Agreements (Term-loan And Other Short-term Debt) (Details) - SCE	12 Months Ended
	Dec. 31, 2020USD ($)
Mortgages
Short-term Debt [Line Items]
Debt, face amount	$ 900,000,000
LIBOR | Mortgages
Short-term Debt [Line Items]
Basis points	0.27%
SCE Term loan credit agreement
Short-term Debt [Line Items]
Debt, face amount	$ 475,000,000
SCE Term loan credit agreement | LIBOR
Short-term Debt [Line Items]
Basis points	0.60%

Derivative Instruments (Textual

Derivative Instruments (Textual) (Details) - SCE - Electric Utility - Economic hedges - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Derivatives
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features	$ 1,000,000	$ 1,000,000
Posted collateral	0	$ 0
Trigger
Derivatives
Potential amount of collateral to be posted if contingencies triggered	$ 3,000,000

Derivative Instruments (Balance

Derivative Instruments (Balance Sheet Disclosures) (Details) - SCE - Electric Utility - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Economic hedges
Derivative Assets
Cash collateral posted	$ (17)
Other current assets | Economic hedges
Derivative Assets
Cash collateral posted		$ (24)
Net Asset
Cash collateral posted	13
Commodity derivative contracts
Derivative Assets
Gross amounts recognized	126	102
Gross amounts offset in the consolidated balance sheets	(18)	(15)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	108	87
Derivative Liabilities
Gross amounts recognized	22	16
Gross amounts offset in the consolidated balance sheets	(18)	(15)
Cash collateral posted	(4)	0
Net amounts presented in the consolidated balance sheets	0	1
Net Asset
Gross amounts recognized	104	86
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	4	0
Net amounts presented in the consolidated balance sheets	108	86
Commodity derivative contracts | Derivative Assets, Short-Term
Derivative Assets
Gross amounts recognized	103	94
Gross amounts offset in the consolidated balance sheets	(12)	(13)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	91	81
Commodity derivative contracts | Derivative Assets, Long-Term
Derivative Assets
Gross amounts recognized	23	8
Gross amounts offset in the consolidated balance sheets	(6)	(2)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	17	6
Commodity derivative contracts | Derivative Liability, Short-Term
Derivative Liabilities
Gross amounts recognized	16	14
Gross amounts offset in the consolidated balance sheets	(12)	(13)
Cash collateral posted	(4)	0
Net amounts presented in the consolidated balance sheets	0	1
Commodity derivative contracts | Derivative Liability, Long-Term
Derivative Liabilities
Gross amounts recognized	6	2
Gross amounts offset in the consolidated balance sheets	(6)	(2)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	$ 0	$ 0

Derivative Instruments (Summari

Derivative Instruments (Summarization of Economic Hedging Activities) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains (losses)	$ 87	$ (7)	$ 26
Unrealized gains (losses)	$ 17	$ (74)	$ 82

Derivative Instruments (Notiona

Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized	12 Months Ended
	Dec. 31, 2020GWhBcfe	Dec. 31, 2019GWhBcfe
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	1,581	3,155
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments | Bcfe	34	43
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	41,151	48,170

Revenue (Summary of Revenue) (D

Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 3,157	$ 4,644	$ 2,987	$ 2,790	$ 2,970	$ 3,741	$ 2,812	$ 2,824	$ 13,578	$ 12,347	$ 12,657
Accrued unbilled revenue	521				488				521	488
SCE
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									12,459	11,167	12,130
Alternative revenue programs and other operating revenue3									1,087	1,139	481
Total operating revenue	3,151	$ 4,635	$ 2,980	$ 2,780	2,958	$ 3,732	2,800	$ 2,816	13,546	12,306	12,611
Receivables from contracts with customers	1,500				1,100				1,500	1,100
Accrued unbilled revenue	$ 521				$ 488				521	488
SCE | 2018 GRC | CPUC
Disaggregation of Revenue [Line Items]
Reduction in revenue							$ 289
SCE | Earning Activities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									6,920	6,512	6,519
Alternative revenue programs and other operating revenue3									548	166	41
Total operating revenue									7,468	6,678	6,560
SCE | Cost- Recovery Activities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									5,539	4,655	5,611
Alternative revenue programs and other operating revenue3									539	973	440
Total operating revenue									$ 6,078	$ 5,628	$ 6,051

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense (Benefit) by Location) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 13	$ 0	$ (57)
State	(22)	6	(155)
Total current	(9)	6	(212)
Deferred:
Federal	(230)	(243)	(386)
State	(66)	(41)	(141)
Total deferred	(296)	(284)	(527)
Total continuing operations	(305)	(278)	(739)
Discontinued operations	0	0	(34)
Total	(305)	(278)	(773)
SCE
Current:
Federal	12	0	(51)
State	(26)	14	(93)
Total current	(14)	14	(144)
Deferred:
Federal	(207)	(206)	(354)
State	(56)	(37)	(198)
Total deferred	(263)	(243)	(552)
Total continuing operations	(277)	(229)	(696)
Discontinued operations	0	0	0
Total	$ (277)	$ (229)	$ (696)

Income Taxes (Components of Net

Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Deferred tax assets:
Property	$ 590		$ 478
Wildfire reserve	1,134		847
Nuclear decommissioning trust assets in excess of nuclear ARO liability	515		449
Loss and credit carryforwards	1,991		1,515
Regulatory asset	841		739
Pension and postretirement benefits other than pensions, net	163		170
Other	513		408
Sub-total	5,747		4,606
Less: valuation allowance	35		35
Total	5,712		4,571
Deferred tax liabilities:
Property	8,879		8,244
Regulatory liability	1,111		570
Nuclear decommissioning trust assets	515		449
Other	514		320
Total	11,019		9,583
Accumulated deferred income tax liability, net	5,307		5,012
Unrecognized tax benefits	679	$ 338	370	$ 432
Recorded valuation allowance	31
Capital loss from sale of SoCore Energy
Deferred tax liabilities:
Recorded valuation allowance	4	4
Loss and Credit Carryforwards
Deferred tax liabilities:
Unrecognized tax benefits	270
SCE
Deferred tax assets:
Property	540		435
Wildfire reserve	1,134		847
Nuclear decommissioning trust assets in excess of nuclear ARO liability	515		449
Loss and credit carryforwards	683		253
Regulatory asset	841		739
Pension and postretirement benefits other than pensions, net	35		40
Other	527		416
Sub-total	4,275		3,179
Less: valuation allowance	0		0
Total	4,275		3,179
Deferred tax liabilities:
Property	8,871		8,234
Regulatory liability	1,111		570
Nuclear decommissioning trust assets	515		449
Other	499		310
Total	10,996		9,563
Accumulated deferred income tax liability, net	6,721		6,384
Unrecognized tax benefits	320	$ 249	$ 282	$ 331
SCE | Loss and Credit Carryforwards
Deferred tax liabilities:
Unrecognized tax benefits	$ 190

Income Taxes (Net Operating Los

Income Taxes (Net Operating Loss and Tax Credit Carryforwards) (Details) $ in Millions	Dec. 31, 2020USD ($)
Tax Credit Carryforward [Line Items]
Loss Carryforwards, Expiring in one year	$ 4
Loss Carryforwards, Expiring between 2022 to 2045	31
Loss Carryforwards, Expiring between 2029 to 2042	1,192
Loss Carryforwards, No expiration date	509
Loss Carryforwards	1,736
Tax Credit Carryforward, Expiring in one year	0
Tax Credit Carryforward, Expiring In Years Two Through Five	0
Credit Carryforward, Expiring 2029 to 2042	515
Credit Carryforward, No expiration date	10
Credit Carryforwards	525
SCE
Tax Credit Carryforward [Line Items]
Loss Carryforwards, Expiring in one year	4
Loss Carryforwards, Expiring between 2022 to 2045	26
Loss Carryforwards, Expiring between 2029 to 2042	380
Loss Carryforwards, No expiration date	413
Loss Carryforwards	823
Tax Credit Carryforward, Expiring in one year	0
Tax Credit Carryforward, Expiring In Years Two Through Five	0
Credit Carryforward, Expiring 2029 to 2042	50
Credit Carryforward, No expiration date	0
Credit Carryforwards	$ 50

Income Taxes (Textual) (Details

Income Taxes (Textual) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Income Tax Disclosure [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$ 446
California Franchise Tax Board | Tax Years 1994 to 2006
Income Tax Disclosure [Line Items]
Refund of tax and interest			$ 65
Capistrano Wind | Affiliated Entity | Tax Allocation Agreement
Income Tax Disclosure [Line Items]
Due to affiliate under tax allocation agreements	218	$ 212
SCE
Income Tax Disclosure [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$ 87

Income Taxes (Tax Rate Reconcil

Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Income (loss) from continuing operations before income taxes	$ 566	$ 1,127	$ (1,089)
Provision for income tax at federal statutory rate of 21% for 2019 and 2018, and 35% for 2017	119	237	(229)
Increase in income tax from:
State tax, net of federal benefit	(61)	(22)	(168)
Property-related	(320)	(303)	(275)
Change related to uncertain tax positions	(15)	0	(66)
Deferred tax re-measurement	0	(88)	0
2018 GRC Final Decision	0	(80)	0
Corporate-owned life insurance cash surrender value	(8)	(8)	(8)
Other	(20)	(14)	7
Total continuing operations	$ (305)	$ (278)	$ (739)
Effective tax rate	(53.90%)	(24.70%)	(67.90%)
SCE
Income Tax Disclosure [Line Items]
Income (loss) from continuing operations before income taxes	$ 665	$ 1,301	$ (885)
Provision for income tax at federal statutory rate of 21% for 2019 and 2018, and 35% for 2017	140	273	(186)
Increase in income tax from:
State tax, net of federal benefit	(52)	(13)	(155)
Property-related	(320)	(303)	(275)
Change related to uncertain tax positions	(19)	0	(71)
Deferred tax re-measurement	0	(88)	0
2018 GRC Final Decision	0	(80)	0
Corporate-owned life insurance cash surrender value	(8)	(8)	(8)
Other	(18)	(10)	(1)
Total continuing operations	$ (277)	$ (229)	$ (696)
Effective tax rate	(41.70%)	(17.60%)	(78.60%)

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	$ 370	$ 338	$ 432
Tax positions taken during the current year, Increases	55	46	41
Tax positions taken during a prior year, Increases	274	6	0
Tax positions taken during a prior year, Decreases	(20)	(20)	(108)
Tax positions taken during a prior year, Decreases for settlements during the period	0	0	(27)
Balance at December 31,	679	370	338
SCE
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	282	249	331
Tax positions taken during the current year, Increases	56	47	42
Tax positions taken during a prior year, Increases	4	6	0
Tax positions taken during a prior year, Decreases	(22)	(20)	(121)
Tax positions taken during a prior year, Decreases for settlements during the period	0	0	(3)
Balance at December 31,	$ 320	$ 282	$ 249

Income Taxes (Interest and Pena

Income Taxes (Interest and Penalties Related to Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Accrued interest and penalties	$ 52	$ 56
Net after-tax interest and penalties tax expense (benefit)	4	4	$ (62)
SCE
Income Tax Disclosure [Line Items]
Accrued interest and penalties	23	29
Net after-tax interest and penalties tax expense (benefit)	$ 6	$ 3	$ (25)

Compensation and Benefit Plan_2

Compensation and Benefit Plans (Employee Savings Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plans [Line Items]
Employer contributions	$ 93	$ 82	$ 74
SCE
Defined Contribution Plans [Line Items]
Employer contributions	$ 92	$ 81	$ 74

Compensation and Benefit Plan_3

Compensation and Benefit Plans (Textual) (Details) shares in Millions	12 Months Ended
	Dec. 31, 2020USD ($)planshares	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health reimbursement monthly contribution	$ 200
Assumed average equity risk premium (as a percent)	5.00%
Forecasted return on private equity and opportunistic investments (as a percent)	4.00%
Performance incentive plan award (in shares) | shares	71
Share-based compensation, shares available for grant | shares	23
Stock options
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Stock options, expiration period, years	10 years
Stock options, vesting period, years	4 years
Volatility period	63 months	66 months	68 months
Global Equities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	58.00%
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions	$ 55,000,000
Permissible range of asset class weights (as a percent)	3.00%
Publicly traded equity investments located in the US (as a percent)	59.00%	56.00%
Pension Plans | US Equities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	23.00%
Pension Plans | Non-US Equities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	17.00%
Pension Plans | Fixed Income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	45.00%
Pension Plans | Opportunistic and/or alternative investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	15.00%
VEBA | Fixed Income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	95.00%
VEBA | Global Equities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	5.00%
PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions	$ 9,000,000
Eligibility age	55 years
Service period for eligibility (at least) (years)	10 years
Publicly traded equity investments located in the US (as a percent)	66.00%	65.00%
PBOP | Fixed Income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	29.00%
PBOP | Opportunistic and/or alternative investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations (as a percent)	13.00%
SCE | Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions	$ 31,000,000
SCE | VEBA
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of plans | plan	3

Compensation and Benefit Plan_4

Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (563)	$ (674)
Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	4,139	3,880
Service cost	121	114
Interest cost	124	155
Actuarial (gain) loss	323	240
Benefits paid	(231)	(250)
Projected benefit obligation at end of year	4,476	4,139	$ 3,880
Change in plan assets
Fair value of plan assets at beginning of year	3,755	3,321
Actual return on plan assets	584	611
Employer contributions	62	73
Benefits paid	(230)	(250)
Fair value of plan assets at end of year	4,171	3,755	$ 3,321
Funded status at end of year	(305)	(384)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities	(24)	(19)
Long-term liabilities	(281)	(365)
Amounts recognized in the consolidated balance sheets	(305)	(384)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost	(1)	(1)
Net loss	96	95
Total amounts recognized in accumulated other comprehensive loss	95	94
Amounts recognized as a regulatory asset (liability)	12	87
Total not yet recognized as income	107	181
Accumulated benefit obligation at end of year	4,238	3,968
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	4,476	4,139
Accumulated benefit obligation	4,238	3,968
Fair value of plan assets	$ 4,171	$ 3,755
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.38%	3.11%	4.19%
Rate of compensation increase	4.00%	4.10%
Gain (loss) from increase in discount rate	$ (339)	$ 401
Gains from other economic assumption changes	(117)	(157)
Pension Plans | Edison International Parent
Weighted average assumptions used to determine obligations at end of year:
Long-term payable	139	133
PBOP
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,083	1,986
Service cost	38	30	$ 37
Interest cost	63	77	80
Actuarial (gain) loss	(46)	70
Plan participants' contributions	29	29
Benefits paid	(94)	(109)
Projected benefit obligation at end of year	2,073	2,083	1,986
Change in plan assets
Fair value of plan assets at beginning of year	2,465	2,133
Actual return on plan assets	309	401
Employer contributions	8	11
Plan participants' contributions	29	29
Benefits paid	(94)	(109)
Fair value of plan assets at end of year	2,717	2,465	2,133
Funded status at end of year	644	382
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	663	393
Current liabilities	(10)	(11)
Long-term liabilities	(9)	0
Amounts recognized in the consolidated balance sheets	644	382
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	1	2
Amounts recognized as a regulatory asset (liability)	(671)	(416)
Total not yet recognized as income	$ (670)	$ (414)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.67%	3.32%
Rate assumed for following year	6.50%	6.50%
Ultimate rate	5.00%	5.00%
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (144)	$ (237)
SCE | Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,662	3,431
Service cost	117	110
Interest cost	110	138
Actuarial (gain) loss	292	199
Benefits paid	(197)	(216)
Projected benefit obligation at end of year	3,984	3,662	3,431
Change in plan assets
Fair value of plan assets at beginning of year	3,541	3,124
Actual return on plan assets	551	576
Employer contributions	45	57
Benefits paid	(197)	(216)
Fair value of plan assets at end of year	3,940	3,541	3,124
Funded status at end of year	(44)	(121)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities	(2)	(2)
Long-term liabilities	(42)	(119)
Amounts recognized in the consolidated balance sheets	(44)	(121)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost	0	0
Net loss	16	17
Total amounts recognized in accumulated other comprehensive loss	16	17
Amounts recognized as a regulatory asset (liability)	12	87
Total not yet recognized as income	28	104
Accumulated benefit obligation at end of year	3,776	3,529
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,984	3,662
Accumulated benefit obligation	3,776	3,529
Fair value of plan assets	$ 3,940	$ 3,541
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.38%	3.11%
Rate of compensation increase	4.00%	4.10%
Net loss reclassified from other comprehensive loss	$ 41	$ 37
Gain (loss) from increase in discount rate	(305)	373
Gains from other economic assumption changes	(124)	(177)
SCE | PBOP
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,074	1,977
Service cost	37	30	37
Interest cost	63	77	80
Actuarial (gain) loss	(45)	70
Plan participants' contributions	29	29
Benefits paid	(94)	(109)
Projected benefit obligation at end of year	2,064	2,074	1,977
Change in plan assets
Fair value of plan assets at beginning of year	2,464	2,133
Actual return on plan assets	309	401
Employer contributions	8	10
Plan participants' contributions	29	29
Benefits paid	(93)	(109)
Fair value of plan assets at end of year	2,717	2,464	$ 2,133
Funded status at end of year	653	390
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	663	402
Current liabilities	(10)	(12)
Long-term liabilities	0	0
Amounts recognized in the consolidated balance sheets	653	390
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	0	0
Amounts recognized as a regulatory asset (liability)	(671)	(416)
Total not yet recognized as income	$ (671)	$ (416)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.67%	3.32%
Rate assumed for following year	6.50%	6.50%
Ultimate rate	5.00%	5.00%

Compensation and Benefit Plan_5

Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Service cost	$ 121	$ 114
Non-service cost
Interest cost	124	155
PBOP
Pension and Other Postretirement Benefits [Line Items]
Service cost	38	30	$ 37
Non-service cost
Interest cost	63	77	80
Expected return on plan assets	(119)	(111)	(121)
Amortization of prior service cost	(1)	(1)	(1)
Amortization of net (gain) loss	(29)	(17)	0
Regulatory adjustment (deferred)	(49)	(29)	(24)
Total non-service benefit	(37)	(23)	(18)
Total expense	1	7	19
SCE
Non-service cost
Total non-service benefit	(102)	(70)	(81)
SCE | Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Service cost	117	110
Non-service cost
Interest cost	110	138
SCE | PBOP
Pension and Other Postretirement Benefits [Line Items]
Service cost	37	30	37
Non-service cost
Interest cost	63	77	80
Expected return on plan assets	(119)	(111)	(122)
Amortization of prior service cost	(1)	(1)	(1)
Amortization of net (gain) loss	(29)	(17)	0
Regulatory adjustment (deferred)	(49)	(29)	(24)
Total non-service benefit	(37)	(23)	(19)
Total expense	0	7	18
Continuing Operations | Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Service cost	121	114	126
Non-service cost
Interest cost	124	155	140
Expected return on plan assets	(215)	(205)	(228)
Amortization of prior service cost	2	2	3
Amortization of net (gain) loss	10	7	9
Regulatory adjustment (deferred)	16	(3)	15
Total non-service benefit	(63)	(44)	(61)
Total expense recognized	58	70	65
Continuing Operations | SCE | Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Service cost	119	111	123
Non-service cost
Interest cost	114	143	128
Expected return on plan assets	(203)	(194)	(214)
Amortization of prior service cost	1	2	3
Amortization of net (gain) loss	7	5	6
Regulatory adjustment (deferred)	16	(3)	15
Total non-service benefit	(65)	(47)	(62)
Total expense recognized	$ 54	$ 64	$ 61

Compensation and Benefit Plan_6

Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension and Other Postretirement Benefits [Line Items]
Net loss	$ 11	$ 19	$ 5
Amortization of net loss	(10)	(7)	(9)
Total recognized in other comprehensive loss	1	12	(4)
Total recognized in expense and other comprehensive loss	59	82	61
SCE
Pension and Other Postretirement Benefits [Line Items]
Net loss	9	21	5
Amortization of net loss	(7)	(5)	(6)
Total recognized in other comprehensive loss	2	16	(1)
Total recognized in expense and other comprehensive loss	$ 56	$ 80	$ 60

Compensation and Benefit Plan_7

Compensation and Benefit Plans (Weighted Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.11%	4.19%	3.46%
Rate of compensation increase	4.10%	4.10%	4.10%
Expected long-term return on plan assets	6.00%	6.50%	6.50%
Interest crediting rate for cash balance account
Starting rate	3.61%	4.46%	4.36%
Ultimate rate	5.00%	5.75%	5.75%
Pension Plans | SCE
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.11%	4.19%	3.46%
Rate of compensation increase	4.10%	4.10%	4.10%
Expected long-term return on plan assets	6.00%	6.50%	6.50%
Interest crediting rate for cash balance account
Starting rate	3.61%	4.46%	4.36%
Ultimate rate	5.00%	5.75%	5.75%
PBOP
Assumed health care cost trend rates:
Ultimate rate	5.00%	5.00%
PBOP | SCE
Assumed health care cost trend rates:
Ultimate rate	5.00%	5.00%
Continuing Operations | PBOP
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.32%	4.35%	3.70%
Expected long-term return on plan assets	4.90%	5.30%	5.30%
Assumed health care cost trend rates:
Current year	6.50%	6.75%	6.75%
Ultimate rate	5.00%	5.00%	5.00%
Continuing Operations | PBOP | SCE
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.32%	4.35%	3.70%
Expected long-term return on plan assets	4.90%	5.30%	5.30%
Assumed health care cost trend rates:
Current year	6.50%	6.75%	6.75%
Ultimate rate	5.00%	5.00%	5.00%

Compensation and Benefit Plan_8

Compensation and Benefit Plans (Expected Future Benefit Payments) (Details) $ in Millions	Dec. 31, 2020USD ($)
Pension Plans
Years ended December 31,
2021	$ 294
2022	297
2023	298
2024	299
2025	302
2026 – 2030	1,403
PBOP
Years ended December 31,
2021	83
2022	84
2023	86
2024	89
2025	90
2026 – 2030	475
SCE | Pension Plans
Years ended December 31,
2021	254
2022	259
2023	262
2024	266
2025	268
2026 – 2030	1,317
SCE | PBOP
Years ended December 31,
2021	82
2022	84
2023	86
2024	88
2025	90
2026 – 2030	$ 472

Compensation and Benefit Plan_9

Compensation and Benefit Plans (Plan Assets - Fair Value Levels) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 4,194	$ 3,777
Fair value NAV	1,746	1,294
Receivables and payables, net	(23)	(22)
Net plan assets available for benefits	4,171	3,755	$ 3,321
Pension Plans | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	797	833
Pension Plans | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,651	1,650
Pension Plans | SCE
Pension and Other Postretirement Benefits [Line Items]
Net plan assets available for benefits	3,940	3,541	3,124
Pension Plans | U.S. government and agency securities
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,157	1,138
Fair value NAV	0	0
Pension Plans | U.S. government and agency securities | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	151	146
Pension Plans | U.S. government and agency securities | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,006	992
Pension Plans | Corporate stocks
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	575	554
Fair value NAV	$ 0	$ 0
Pension Plans | Corporate stocks | Russell Indexes
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	40.00%	40.00%
Pension Plans | Corporate stocks | MSCI index
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	60.00%	60.00%
Pension Plans | Corporate stocks | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 570	$ 547
Pension Plans | Corporate stocks | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	5	7
Pension Plans | Corporate bonds
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	601	572
Fair value NAV	0	0
Pension Plans | Corporate bonds | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Corporate bonds | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	601	572
Pension Plans | Common/collective funds
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,017	693
Fair value NAV	$ 1,017	$ 693
Pension Plans | Common/collective funds | Standard And Poors 500 Index
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	37.00%	35.00%
Pension Plans | Common/collective funds | Russell 1000 index
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	13.00%	17.00%
Pension Plans | Common/collective funds | MSCI All Country World Index
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	40.00%	28.00%
Pension Plans | Common/collective funds | MSCI All Country World Index exUS
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	8.00%	12.00%
Pension Plans | Common/collective funds | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Pension Plans | Common/collective funds | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Partnerships/joint ventures
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	569	471
Fair value NAV	$ 569	$ 471
Pension Plans | Partnerships/joint ventures | Private equity
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	49.00%	51.00%
Pension Plans | Partnerships/joint ventures | ABS Including Distressed Mortgages and Commercial and Residential Loans
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	23.00%	17.00%
Pension Plans | Partnerships/joint ventures | Publicly Traded Fixed Income Securities
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	19.00%	19.00%
Pension Plans | Partnerships/joint ventures | Broad range of financial assets in all global markets
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	4.00%	8.00%
Pension Plans | Partnerships/joint ventures | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Pension Plans | Partnerships/joint ventures | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Other investment entities
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	137	130
Fair value NAV	137	130
Pension Plans | Other investment entities | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Other investment entities | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Registered investment companies
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	92	133
Fair value NAV	23	0
Pension Plans | Registered investment companies | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	69	133
Pension Plans | Registered investment companies | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Interest-bearing cash
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	7	7
Fair value NAV	0	0
Pension Plans | Interest-bearing cash | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	7	7
Pension Plans | Interest-bearing cash | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Other
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	39	79
Fair value NAV	0	0
Pension Plans | Other | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
Pension Plans | Other | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	39	79
Pension Plans | Collateralized mortgage obligations and other asset backed securities
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	54	45
PBOP
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	2,713	2,484
Receivables and payables, net	4	(19)
Net plan assets available for benefits	2,717	2,465	2,133
PBOP | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	669	696
PBOP | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,270	1,068
PBOP | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	774	720
PBOP | SCE
Pension and Other Postretirement Benefits [Line Items]
Net plan assets available for benefits	2,717	2,464	$ 2,133
PBOP | U.S. government and agency securities
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	410	449
PBOP | U.S. government and agency securities | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	380	386
PBOP | U.S. government and agency securities | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	30	63
PBOP | U.S. government and agency securities | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Corporate stocks
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 227	$ 244
PBOP | Corporate stocks | Russell Indexes
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	70.00%	68.00%
PBOP | Corporate stocks | MSCI All Country World Index
Pension and Other Postretirement Benefits [Line Items]
Performance percentage benchmark, percentage	30.00%	32.00%
PBOP | Corporate stocks | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 224	$ 242
PBOP | Corporate stocks | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	3	2
PBOP | Corporate stocks | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Corporate notes and bonds
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,079	885
PBOP | Corporate notes and bonds | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Corporate notes and bonds | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	1,079	885
PBOP | Corporate notes and bonds | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Common/collective funds
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 693	$ 652
PBOP | Common/collective funds | MSCI All Country World Index Investable Market Index
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	70.00%	74.00%
PBOP | Common/collective funds | Non-index U.S. equity fund
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	22.00%	19.00%
PBOP | Common/collective funds | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
PBOP | Common/collective funds | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Common/collective funds | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	693	652
PBOP | Partnerships/joint ventures
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 81	$ 68
PBOP | Partnerships/joint ventures | Private equity
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	46.00%	55.00%
PBOP | Partnerships/joint ventures | Broad range of financial assets in all global markets
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	18.00%	15.00%
PBOP | Partnerships/joint ventures | Asset backed securities including distressed mortgages
Pension and Other Postretirement Benefits [Line Items]
Actual plan asset allocations, percentage	36.00%	28.00%
PBOP | Partnerships/joint ventures | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
PBOP | Partnerships/joint ventures | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Partnerships/joint ventures | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	81	68
PBOP | Registered investment companies
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	65	66
PBOP | Registered investment companies | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	65	66
PBOP | Registered investment companies | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Registered investment companies | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Interest-bearing cash
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	26	17
PBOP | Interest-bearing cash | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Interest-bearing cash | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	26	17
PBOP | Interest-bearing cash | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Other
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	132	103
PBOP | Other | Municipal securities
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	61	66
PBOP | Other | Level 1
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	2
PBOP | Other | Level 2
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	132	101
PBOP | Other | NAV
Pension and Other Postretirement Benefits [Line Items]
Fair value of plan assets	0	0
PBOP | Collateralized mortgage obligations and other asset backed securities
Pension and Other Postretirement Benefits [Line Items]
Receivables and payables, net	$ 170	$ 49

Compensation and Benefit Pla_10

Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) - PBOP - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 2,713	$ 2,484
Receivables and payables, net	4	(19)
Net plan assets available for benefits	2,717	2,465	$ 2,133
Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	669	696
Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1,270	1,068
NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	774	720
U.S. government and agency securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	410	449
U.S. government and agency securities | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	380	386
U.S. government and agency securities | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	30	63
U.S. government and agency securities | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Corporate stocks
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 227	$ 244
Corporate stocks | Russell Indexes
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Performance percentage benchmark, percentage	70.00%	68.00%
Corporate stocks | MSCI All Country World Index
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Performance percentage benchmark, percentage	30.00%	32.00%
Corporate stocks | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 224	$ 242
Corporate stocks | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	3	2
Corporate stocks | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Corporate notes and bonds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1,079	885
Corporate notes and bonds | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Corporate notes and bonds | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	1,079	885
Corporate notes and bonds | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Common/collective funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 693	$ 652
Common/collective funds | Non-index U.S. equity fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual plan asset allocations, percentage	22.00%	19.00%
Common/collective funds | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 0	$ 0
Common/collective funds | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Common/collective funds | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	693	652
Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 81	$ 68
Partnerships | Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual plan asset allocations, percentage	46.00%	55.00%
Partnerships | Broad range of financial assets in all global markets
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual plan asset allocations, percentage	18.00%	15.00%
Partnerships | Asset backed securities including distressed mortgages
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual plan asset allocations, percentage	36.00%	28.00%
Partnerships | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 0	$ 0
Partnerships | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Partnerships | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	81	68
Registered investment companies
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	65	66
Registered investment companies | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	65	66
Registered investment companies | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Registered investment companies | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Interest bearing cash
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	26	17
Interest bearing cash | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Interest bearing cash | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	26	17
Interest bearing cash | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Other
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	132	103
Other | Municipal securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	61	66
Other | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	2
Other | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	132	101
Other | NAV
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0
Collateralized mortgage obligations and other asset backed securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Receivables and payables, net	170	49
SCE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net plan assets available for benefits	$ 2,717	$ 2,464	$ 2,133

Compensation and Benefit Pla_11

Compensation and Benefit Plans (Expense and Tax Benefits of Stock Based Compensation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 29	$ 29	$ 21
Income tax benefits related to stock compensation expense	4	10	6
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	15	13	11
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	5	8	1
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8	6	7
Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1	2	2
SCE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	13	14	11
Income tax benefits related to stock compensation expense	3	6	3
SCE | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7	7	6
SCE | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2	4	1
SCE | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4	3	4
SCE | Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	$ 0	$ 0

Compensation and Benefit Pla_12

Compensation and Benefit Plans (Black-Scholes Option Pricing Model Assumptions) (Details) - Stock options	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected terms (in years)	5 years 2 months 12 days	5 years 6 months	5 years 8 months 12 days
Risk-free interest rate, minimum	0.40%	1.60%	2.60%
Risk-free interest rate, maximum	0.60%	2.30%	3.00%
Weighted average expected dividend yield	4.70%	3.90%	3.80%
Expected volatility, minimum	24.90%	21.70%	20.90%
Expected volatility, maximum	26.90%	24.10%	21.90%
Weighted average volatility	25.00%	21.80%	20.90%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	4.20%	3.30%	3.60%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	5.00%	4.00%	4.30%

Compensation and Benefit Pla_13

Compensation and Benefit Plans (Stock Option Activity) (Details) - Stock options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares
Stock Options
Beginning balance (in shares) | shares	9,278,677
Grants (in shares) | shares	1,993,954
Forfeited or expired (in shares) | shares	(203,340)
Exercised (in shares) | shares	(359,908)
Ending balance (in shares) | shares	10,709,383
Vested and expected to vest (in shares) | shares	10,391,796
Exercisable (in shares) | shares	6,489,876
Exercise Price
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares	$ 62.27
Granted, weighted average exercise price (in dollars per share) | $ / shares	68.60
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	65.75
Exercised, weighted average exercise price (in dollars per share) | $ / shares	48.59
Ending balance, weighted average exercise price (in dollars per share) | $ / shares	63.85
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	63.60
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 62.08
Remaining Contractual Term (Years)
Outstanding (term)	6 years 10 days
Vested and expected to vest (term)	6 years 2 months 1 day
Exercisable (term)	4 years 9 months 29 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2020 | $	$ 30
Exercisable at December 31, 2020 | $	27
Exercise of option, tax benefit | $	$ 2
SCE
Stock Options
Beginning balance (in shares) | shares	4,934,702
Grants (in shares) | shares	1,053,923
Forfeited or expired (in shares) | shares	(189,691)
Exercised (in shares) | shares	(302,911)
Transfers, net (in shares) | shares	(5,535)
Ending balance (in shares) | shares	5,490,488
Vested and expected to vest (in shares) | shares	5,325,052
Exercisable (in shares) | shares	3,361,238
Exercise Price
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares	$ 61.01
Granted, weighted average exercise price (in dollars per share) | $ / shares	68.27
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	65.75
Exercised, weighted average exercise price (in dollars per share) | $ / shares	49.49
Transfers, net, weighted average exercise price (in dollars per share) | $ / shares	63.36
Ending balance, weighted average exercise price (in dollars per share) | $ / shares	62.85
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	62.50
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 60.41
Remaining Contractual Term (Years)
Outstanding (term)	5 years 10 months 9 days
Vested and expected to vest (term)	5 years 11 months 23 days
Exercisable (term)	4 years 6 months 21 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2020 | $	$ 20
Exercisable at December 31, 2020 | $	19
Exercise of option, tax benefit | $	$ 2

Compensation and Benefit Pla_14

Compensation and Benefit Plans (Unrecognized Compensation Costs) (Details) - Stock options $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Pension and Other Postretirement Benefits [Line Items]
Unrecognized compensation cost, net of expected forfeitures (in millions)	$ 17
Weighted average period (in years)	2 years 3 months 18 days
SCE
Pension and Other Postretirement Benefits [Line Items]
Unrecognized compensation cost, net of expected forfeitures (in millions)	$ 9
Weighted average period (in years)	2 years 3 months 18 days

Compensation and Benefit Pla_15

Compensation and Benefit Plans (Supplemental Data on Stock Options) (Details) - Stock options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per option granted (in dollars per share)	$ 8.18	$ 8.80	$ 8.21
Fair value of options vested	$ 2	$ 14	$ 14
Value of options exercised	$ 9	$ 27	$ 10
SCE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per option granted (in dollars per share)	$ 8.16	$ 8.83	$ 8.22
Fair value of options vested	$ 2	$ 7	$ 7
Value of options exercised	$ 7	$ 19	$ 7

Compensation and Benefit Pla_16

Compensation and Benefit Plans (Nonvested Performance Share Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity Awards
Shares
Beginning balance (in shares)	119,843
Granted (in shares)	120,938
Forfeited (in shares)	(7,157)
Vested (in shares)	0
Ending balance (in shares)	233,624	119,843
Weighted Average Grant Date Fair Value
Beginning balance, weighted average grant date fair value (in dollars per share)	$ 66.03
Granted, weighted average grant date fair value (in dollars per share)	67.55
Forfeited, weighted average grant date fair value (in dollars per share)	66.76
Vested, weighted average grant date fair value (in dollars per share)	0
Ending balance, weighted average grant date fair value (in dollars per share)	$ 66.80	$ 66.03
Liability Awards
Shares
Beginning balance (in shares)	113,186
Granted (in shares)	0
Forfeited (in shares)	(3,825)
Vested (in shares)	(109,361)
Ending balance (in shares)	0	113,186
Weighted Average Grant Date Fair Value
Beginning balance, weighted average grant date fair value (in dollars per share)	$ 67.30
Ending balance, weighted average grant date fair value (in dollars per share)	$ 0	$ 67.30
SCE | Equity Awards
Shares
Beginning balance (in shares)	63,172
Granted (in shares)	64,133
Forfeited (in shares)	(6,408)
Vested (in shares)	0
Affiliate transfers, net (in shares)	(253)
Ending balance (in shares)	120,644	63,172
Weighted Average Grant Date Fair Value
Beginning balance, weighted average grant date fair value (in dollars per share)	$ 66.27
Granted, weighted average grant date fair value (in dollars per share)		$ 67.15
Forfeited, weighted average grant date fair value (in dollars per share)		66.78
Vested, weighted average grant date fair value (in dollars per share)		0
Ending balance, weighted average grant date fair value (in dollars per share)	$ 66.70	66.27
Affiliate transfers, net, weighted average grant date fair value (in dollars per share)		$ 71.27
SCE | Liability Awards
Shares
Beginning balance (in shares)	58,399
Granted (in shares)	0
Forfeited (in shares)	(3,409)
Vested (in shares)	(54,578)
Affiliate transfers, net (in shares)	(412)
Ending balance (in shares)	0	58,399
Weighted Average Grant Date Fair Value
Beginning balance, weighted average grant date fair value (in dollars per share)	$ 67.34
Ending balance, weighted average grant date fair value (in dollars per share)	$ 0	$ 67.34

Compensation and Benefit Pla_17

Compensation and Benefit Plans (Restricted Stock Unit Activity) (Details) - Restricted stock units	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Restricted Stock Units
Beginning balance (in shares) | shares	311,682
Granted (in shares) | shares	119,038
Forfeited (in shares) | shares	(11,294)
Vested (in shares) | shares	(85,553)
Affiliate transfers, net (in shares) | shares	0
Ending balance (in shares) | shares	333,873
Weighted Average Grant Date Fair Value
Beginning balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 66.11
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	68.58
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	63.90
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	78.94
Affiliate transfers, net, weighted average grant date fair value (in dollars per share) | $ / shares	0
Ending balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 63.78
SCE
Restricted Stock Units
Beginning balance (in shares) | shares	159,985
Granted (in shares) | shares	63,042
Forfeited (in shares) | shares	(10,095)
Vested (in shares) | shares	(42,549)
Affiliate transfers, net (in shares) | shares	(1,963)
Ending balance (in shares) | shares	168,420
Weighted Average Grant Date Fair Value
Beginning balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 66.16
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	68.24
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	63.93
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	79.11
Affiliate transfers, net, weighted average grant date fair value (in dollars per share) | $ / shares	68.16
Ending balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 63.78

Investments (Amortized Cost and

Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 4,833	$ 4,562
SCE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	2,494	2,447
Fair Value	4,833	4,562
SCE | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	1,013	822
SCE | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	740	996
SCE | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	460	597
SCE | Short-term investments and receivables/payables1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	281	32
SCE | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,039	4,673
SCE | Fair Value, Measurements, Recurring | Stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,908	1,765
SCE | Fair Value, Measurements, Recurring | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,218	970
SCE | Fair Value, Measurements, Recurring | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	864	1,115
SCE | Fair Value, Measurements, Recurring | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	550	679
SCE | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	293	33
Repurchase agreements payable	$ 138	$ 41

Investments (Nuclear Decommissi

Investments (Nuclear Decommissioning Trusts) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Unrealized holding gains, net of losses	$ 2,100	$ 1,800
Deferred income taxes related to unrealized gains	515	449
Nuclear decommissioning trusts	$ 4,300	$ 4,100

Investments (Gains and Losses o

Investments (Gains and Losses on Equity Investments) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Gross realized gains	$ 255	$ 87	$ 134
Gross realized losses	(6)	(2)	(27)
Net unrealized gains (losses) for equity securities	$ 176	$ 343	$ (233)

Regulatory Assets and Liabili_3

Regulatory Assets and Liabilities (Textual) (Details) - SCE	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory assets, energy derivatives, low range of contract expiration (in years)	2 years
Regulatory assets, energy derivatives, high range of contract expiration (in years)	3 years
Regulatory assets related to deferred income taxes, recovery period, low range (in years)	1 year
Regulatory assets related to deferred income taxes, recovery period, high range (in years)	60 years
Low end of the range of remaining original amortization (in years)	10 years
High end of the range of remaining original amortization (in years)	40 years
Unamortized investments, net of accumulated amortization
Regulatory Assets [Line Items]
Return rate earned on assets included in rate base (as a percent)	7.68%	7.61%

Regulatory Assets and Liabili_4

Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Current regulatory assets	$ 1,314	$ 1,009
Long-term regulatory assets	7,120	6,088
SCE
Regulatory Assets [Line Items]
Current regulatory assets	1,314	1,009
Long-term regulatory assets	7,120	6,088
Total regulatory assets	8,434	7,097
SCE | Regulatory balancing and memorandum accounts
Regulatory Assets [Line Items]
Current regulatory assets	1,127	798
Long-term regulatory assets	1,794	981
SCE | Power contracts
Regulatory Assets [Line Items]
Current regulatory assets	165	189
Long-term regulatory assets	239	434
SCE | Other
Regulatory Assets [Line Items]
Current regulatory assets	22	22
Long-term regulatory assets	106	62
SCE | Deferred income taxes, net of liabilities
Regulatory Assets [Line Items]
Long-term regulatory assets	4,475	4,026
SCE | Pension and other postretirement benefits
Regulatory Assets [Line Items]
Long-term regulatory assets	12	87
SCE | Unamortized investments, net of accumulated amortization
Regulatory Assets [Line Items]
Long-term regulatory assets	114	119
SCE | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Long-term regulatory assets	133	142
SCE | Environmental remediation
Regulatory Assets [Line Items]
Long-term regulatory assets	$ 247	$ 237

Regulatory Assets and Liabili_5

Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 569	$ 972
Long-term regulatory liabilities	8,589	8,385
SCE
Regulatory Liabilities [Line Items]
Current regulatory liabilities	569	972
Long-term regulatory liabilities	8,589	8,385
Total regulatory liabilities	9,158	9,357
SCE | Regulatory balancing and memorandum accounts
Regulatory Liabilities [Line Items]
Current regulatory liabilities	471	883
Long-term regulatory liabilities	1,062	1,261
SCE | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities	87	80
SCE | Other
Regulatory Liabilities [Line Items]
Current regulatory liabilities	11	9
Long-term regulatory liabilities	48	41
SCE | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,595	2,674
SCE | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,283	2,424
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,930	1,569
SCE | Other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	$ 671	$ 416

Regulatory Assets and Liabili_6

Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory balancing accounts | Energy resource recovery account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	$ (89)	$ (23)
Regulatory balancing accounts | Portfolio allocation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	497	537
Regulatory balancing accounts | New system generation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	(10)	85
Revenue subject to refund | Significant components
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	1,388	(365)
Revenue subject to refund | Public purpose programs and energy efficiency programs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	(1,130)	(1,244)
Revenue subject to refund | Base revenue requirement balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	622	(328)
Revenue subject to refund | Greenhouse gas auction revenue and low carbon fuel standard revenue
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	(125)	(196)
Revenue subject to refund | FERC balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	12	(127)
Revenue subject to refund | Wildfire and drought restoration account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	361	120
Revenue subject to refund | Wildfire expense memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	1,104	748
Revenue subject to refund | COVID-19-related memorandum accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	176	0
Revenue subject to refund | Other
Regulatory Assets and Liabilities
Net regulatory assets (liabilities) pertaining to balancing accounts	$ (30)	$ 63

Commitments and Contingencies_2

Commitments and Contingencies (Undiscounted Future Minimum Expected Payments for Power Purchase Agreements) (Details) - SCE - Power Purchase Agreements $ in Millions	Dec. 31, 2020USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2021	$ 3,144
2022	3,066
2023	2,937
2024	2,349
2025	2,236
Thereafter	21,756
Total future commitments	35,488
Future short-term lease payments	242
Future long-term minimum lease payments	$ 866

Commitments and Contingencies_3

Commitments and Contingencies (Power Purchase Agreements Narrative) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecorded Unconditional Purchase Obligation [Line Items]
Costs incurred for power purchase agreements	$ 3,800	$ 3,700	$ 3,800
Signed contracts, not meeting critical contract provisions
Unrecorded Unconditional Purchase Obligation [Line Items]
2021	29
2022	72
2023	93
2024	111
2025	111
Thereafter	$ 1,200

Commitments and Contingencies_4

Commitments and Contingencies (Other Commitments) (Details) - SCE - Other contractual obligations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecorded Unconditional Purchase Obligation [Line Items]
2021	$ 46
2022	43
2023	43
2024	45
2025	37
Thereafter	154
Total	368
Costs incurred	$ 80	$ 110	$ 124

Commitments and Contingencies_5

Commitments and Contingencies (Contingencies) (Details) settlement in Thousands, plaintiff in Thousands, customer in Thousands	Feb. 18, 2021lawsuitplaintiff	Jan. 22, 2021USD ($)	Jan. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Oct. 31, 2020USD ($)	Sep. 30, 2020USD ($)astructureinjury	Oct. 31, 2019astructureinjuryfatality	Jul. 31, 2019USD ($)	Feb. 18, 2021USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)power_shut_offcustomersettlement	Dec. 31, 2019USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Jan. 31, 2019claim	Nov. 30, 2018astructurefatality	Jan. 31, 2018fatality	Jan. 01, 2018fatalitystructure	Dec. 04, 2017astructurefatality
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Estimated insurance recoveries				$ 708,000,000							$ 708,000,000			$ 708,000,000	$ 708,000,000
Loss contingency accrual				4,400,000,000							4,400,000,000			4,400,000,000	4,400,000,000
Settlement payments				1,800,000,000							1,800,000,000			1,800,000,000	1,800,000,000
Cumulative expected recoveries											89,000,000
2017/2018 Wildfire/Mudslide Events | Settlements executed after year end
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							2,200,000,000			2,200,000,000	2,200,000,000
2017/2018 Wildfire/Mudslide Events | Alleged and potential claims
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							2,200,000,000			2,200,000,000	2,200,000,000
2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingencies [Line Items]
Litigation settlement		$ 19,000,000
Woolsey Fire
Loss Contingencies [Line Items]
Loss contingency accrual				2,152,000,000							2,152,000,000			2,152,000,000	2,152,000,000
Woolsey Fire | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	243
Litigation settlement		2,212,000,000
Thomas and Koenigstein Fires | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	150
Thomas and Koenigstein Fires and Montecito Mudslides | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	40
San Onofre OII
Loss Contingencies [Line Items]
Lawsuits | claim																2
Wildfire Related Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate											1,328,000,000
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate						$ 1,300,000,000
Estimated recoveries						84,000,000
Wildfire-related charges						1,200,000,000
Wildfire-related charges, net of tax						874,000,000
Estimated insurance recoveries				708,000,000							708,000,000			708,000,000	708,000,000
Loss contingency accrual				4,400,000,000						$ 4,500,000,000	4,400,000,000	$ 4,500,000,000		4,400,000,000	4,400,000,000
Expected revenue from FERC customers				89,000,000							89,000,000			89,000,000	89,000,000
2019/2020 Wildfires
Loss Contingencies [Line Items]
Accrued estimated losses wildfire-related claims											117,000,000
Estimated insurance recoveries				75,000,000							$ 75,000,000			75,000,000	75,000,000
SCE
Loss Contingencies [Line Items]
High fire risk service area, percent											27.00%
PSPS | power_shut_off											12
Customers impacted by PSPS | customer											140
Wildfire-related charges											$ 1,213,000,000
Wildfire-related charges, net of tax											874,000,000
Wildfire insurance coverage												1,000,000,000	$ 1,200,000,000
Self insurance												10,000,000	$ 50,000,000
SCE | CPUC
Loss Contingencies [Line Items]
Requested increase rate amount				214,000,000				$ 505,000,000
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Estimated insurance recoveries				708,000,000							708,000,000			708,000,000	708,000,000
Loss contingency accrual				4,400,000,000							4,400,000,000			4,400,000,000	4,400,000,000
Settlement payments				1,800,000,000							1,800,000,000			1,800,000,000	1,800,000,000
Cumulative expected recoveries											$ 89,000,000
Number of plaintiffs | settlement											1
SCE | 2017/2018 Wildfire/Mudslide Events | Settlements executed after year end
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							$ 2,200,000,000			2,200,000,000	2,200,000,000
SCE | 2017/2018 Wildfire/Mudslide Events | Alleged and potential claims
Loss Contingencies [Line Items]
Loss contingency accrual				2,200,000,000							2,200,000,000			2,200,000,000	2,200,000,000
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingencies [Line Items]
Litigation settlement		19,000,000
SCE | Woolsey Fire
Loss Contingencies [Line Items]
Loss contingency accrual				2,152,000,000							2,152,000,000			2,152,000,000	2,152,000,000
SCE | Woolsey Fire | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	301
Number of plaintiffs | plaintiff	6
Litigation settlement		$ 2,212,000,000
SCE | Thomas and Koenigstein Fires | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	295
Number of plaintiffs | plaintiff	4
SCE | Thomas and Koenigstein Fires and Montecito Mudslides | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	72
SCE | Thomas and Koenigstein Fires, class action | Subsequent event
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	4
SCE | Wildfire Related Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate											1,328,000,000
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate						1,300,000,000					1,297,000,000	232,000,000		6,200,000,000
Estimated recoveries						84,000,000					84,000,000
Wildfire-related charges						1,200,000,000
Wildfire-related charges, net of tax						$ 874,000,000
Estimated insurance recoveries				708,000,000						1,710,000,000	708,000,000	1,710,000,000		708,000,000	708,000,000
Loss contingency accrual				4,383,000,000						4,541,000,000	4,383,000,000	4,541,000,000		4,383,000,000	4,383,000,000
Cumulative expected recoveries															233,000,000
Payment agreement for each dollar of claim					$ 0.555
Litigation settlement											300,000,000
Payments and settlements														4,100,000,000
Payments					$ 1,200,000,000					$ 360,000,000	1,455,000,000
Settlements and recoveries											1,002,000,000			1,300,000,000
Expected revenue from FERC customers				89,000,000							89,000,000			89,000,000	89,000,000
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingencies [Line Items]
Payment agreement for each dollar of claim			$ 0.67
Litigation settlement									$ 80,000,000
Payments			$ 2,200,000,000
SCE | December 2017 Wildfires
Loss Contingencies [Line Items]
Acres burned | a																				280,000
Structures destroyed | structure																				1,343
Fatalities | fatality																				2
SCE | December 2017 Wildfires | CPUC
Loss Contingencies [Line Items]
Requested increase rate amount								$ 6,000,000
SCE | November 2018 Wildfires
Loss Contingencies [Line Items]
Acres burned | a																	100,000
Structures damaged | structure																	364
Structures destroyed | structure																	1,643
Fatalities | fatality																	3
Additional fatalities | fatality																	2
Wildfire insurance coverage												1,000,000,000
Self insurance												$ 10,000,000
SCE | 2019/2020 Wildfires
Loss Contingencies [Line Items]
Self-Insurance retention											31,000,000
Self-Insurance retention, net of tax											21,000,000
Accrued estimated losses wildfire-related claims											117,000,000
Estimated insurance recoveries				$ 75,000,000							75,000,000			$ 75,000,000	$ 75,000,000
SCE | 2019/2020 Wildfires | FERC
Loss Contingencies [Line Items]
Estimated recoveries											$ 3,000,000
SCE | Saddle Ridge Fire
Loss Contingencies [Line Items]
Acres burned | a							9,000
Structures damaged | structure							88
Structures destroyed | structure							19
Number of injured | injury							8
Fatalities | fatality							1
SCE | Bobcat Fire
Loss Contingencies [Line Items]
Acres burned | a						116,000
Number of injured | injury						6
Estimated fire suppression costs						$ 80,000,000
SCE | Bobcat Fire | Home
Loss Contingencies [Line Items]
Structures damaged | structure						28
Structures destroyed | structure						87
SCE | Bobcat Fire | Commercial Property
Loss Contingencies [Line Items]
Structures destroyed | structure						1
SCE | Bobcat Fire | Minor Structures
Loss Contingencies [Line Items]
Structures damaged | structure						19
Structures destroyed | structure						83
SCE | Montecito Mudslides
Loss Contingencies [Line Items]
Structures damaged																		135	324
Fatalities | fatality																			21
Additional fatalities presumed | fatality																			2

Commitments and Contingencies_6

Commitments and Contingencies (Schedule of Estimated Losses) (Details) - USD ($) $ in Millions	Jan. 22, 2021	Jan. 31, 2021	Oct. 31, 2020	Sep. 30, 2020	Feb. 18, 2021	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Loss Contingency Accrual [Roll Forward]
Wildfire-related claims										$ 2,231	$ 0
Woolsey Fire
Loss Contingency Accrual [Roll Forward]
Beginning balance		$ 2,152			$ 2,152
Ending balance							$ 2,152		$ 2,152
Loss contingency accrual		2,152			2,152		2,152		2,152	2,152
Woolsey Fire | Subsequent event
Loss Contingency Accrual [Roll Forward]
Litigation settlement	$ 2,212
2017/2018 Wildfire/Mudslide Events
Loss Contingency Accrual [Roll Forward]
Beginning balance		4,400			4,400
Ending balance							4,400		4,400
Loss contingency accrual		4,400			4,400		4,400		4,400	4,400
2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingency Accrual [Roll Forward]
Litigation settlement	19
Other wildfire-related claims
Loss Contingency Accrual [Roll Forward]
Beginning balance		129			129
Ending balance							129		129
Loss contingency accrual		129			129		129		129	129
2017/2018 Wildfire/Mudslide Events
Loss Contingency Accrual [Roll Forward]
Beginning balance		4,400			4,400		4,500
Increase in accrued estimated losses to reflect best estimate				$ 1,300
Ending balance						$ 4,500	4,400	$ 4,500	4,400
Loss contingency accrual		4,400			4,400	4,500	4,500	4,500	4,400	4,400	4,500
Loss Contingency Accrual, Disclosures [Abstract]
Charge for wildfire-related claims				1,300
2017/2018 Wildfire/Mudslide Events | Deferred credits and other liabilities
Loss Contingency Accrual [Roll Forward]
Beginning balance		2,281			2,281
Ending balance							2,281		2,281
Loss contingency accrual		2,281			2,281		2,281		2,281	2,281
SCE
Loss Contingency Accrual [Roll Forward]
Wildfire-related claims										2,231	0
SCE | Woolsey Fire
Loss Contingency Accrual [Roll Forward]
Beginning balance		2,152			2,152
Ending balance							2,152		2,152
Loss contingency accrual		2,152			2,152		2,152		2,152	2,152
SCE | Woolsey Fire | Subsequent event
Loss Contingency Accrual [Roll Forward]
Litigation settlement	2,212
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingency Accrual [Roll Forward]
Beginning balance		4,400			4,400
Ending balance							4,400		4,400
Loss contingency accrual		4,400			4,400		4,400		4,400	4,400
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingency Accrual [Roll Forward]
Litigation settlement	$ 19
SCE | Other wildfire-related claims
Loss Contingency Accrual [Roll Forward]
Beginning balance		129			129
Ending balance							129		129
Loss contingency accrual		129			129		129		129	129
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingency Accrual [Roll Forward]
Beginning balance		4,383			4,383		4,541
Increase in accrued estimated losses to reflect best estimate				1,300			1,297	232	6,200
Amounts paid			$ (1,200)			(360)	(1,455)
Ending balance						4,541	4,383	4,541	4,383
Litigation settlement							300
Loss contingency accrual		4,383			4,383	$ 4,541	4,383	4,541	4,383	4,383	$ 4,541
Loss Contingency Accrual, Disclosures [Abstract]
Charge for wildfire-related claims				$ 1,300			1,297	232	6,200
Expected revenue from FERC customers							(84)	(14)
Total pre-tax charge							1,213	218
Income tax benefit							(339)	(61)
Total after-tax charge							874	$ 157
SCE | 2017/2018 Wildfire/Mudslide Events | Deferred credits and other liabilities
Loss Contingency Accrual [Roll Forward]
Beginning balance		2,281			2,281
Ending balance							2,281		2,281
Loss contingency accrual		2,281			2,281		$ 2,281		$ 2,281	$ 2,281
SCE | 2017/2018 Wildfire/Mudslide Events | Subsequent event
Loss Contingency Accrual [Roll Forward]
Amounts paid		$ (2,200)
Litigation settlement					$ 80

Commitments and Contingencies_7

Commitments and Contingencies (Insurance Recovery) (Details) - 2017/2018 Wildfire/Mudslide Events - USD ($) $ in Millions	12 Months Ended	37 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance at December 31, 2020	$ 708	$ 708
SCE
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance at December 31, 2019	1,710
Insurance recoveries	(1,002)	(1,300)
Balance at December 31, 2020	$ 708	$ 708

Commitments and Contingencies_8

Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($)	1 Months Ended		12 Months Ended			13 Months Ended
	Dec. 31, 2020	Jul. 31, 2019	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Loss Contingencies [Line Items]
Wildfire insurance expense				$ 450,000,000	$ 400,000,000
SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage					1,000,000,000	$ 1,200,000,000
Co-insurance						115,000,000
Self insurance					$ 10,000,000	50,000,000
Coverage net						$ 1,000,000,000
SCE | CPUC
Loss Contingencies [Line Items]
Requested increase rate amount	$ 214,000,000	$ 505,000,000
Authorized recovery		$ 505,000,000
Collection period		2 years
SCE | CPUC | 2018 GRC
Loss Contingencies [Line Items]
Requested increase rate amount	$ 204,000,000	$ 478,000,000
SCE | Forecast
Loss Contingencies [Line Items]
Wildfire insurance coverage			$ 1,000,000,000
Co-insurance			80,000,000
Self insurance			50,000,000
Coverage net			$ 870,000,000

Commitments and Contingencies_9

Commitments and Contingencies (Recovery of Wildfire-Related Costs ) (Details) - USD ($) $ in Millions	Jan. 01, 2021	Jul. 01, 2020	Jan. 01, 2020	Jul. 12, 2019	Nov. 30, 2020	Sep. 30, 2019	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 25, 2021
Other Commitments [Line Items]
Amortization period								10 years
Subsequent event
Other Commitments [Line Items]
Amortization period							15 years
SCE and SDG&E
Other Commitments [Line Items]
Initial contributions						$ 2,700
Two annual contributions								$ 600
PG&E
Other Commitments [Line Items]
Expected initial contribution		$ 4,800
Initial contribution from ratepayers				$ 6,100
PG&E, SCE and SDG&E
Other Commitments [Line Items]
Expected annual contribution				3,000
SCE
Other Commitments [Line Items]
Initial contributions						$ 2,400
Expected annual contribution				95
Initial contribution from ratepayers				$ 6,100
Annual contributions								$ 2,600
Amortization period								10 years
Fund expected life								15 years
Maximum aggregate requirement to reimburse the insurance fund percent				20.00%
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)			52.00%						48.00%	45.20%
Capital expenditures				$ 1,600
AB 1054 excluded capital expenditures								$ 1,300
SCE | Subsequent event | Securitized bonds | Securitized bonds
Other Commitments [Line Items]
Debt, face amount											$ 338
SCE | CPUC
Other Commitments [Line Items]
Requested irrevocable order					$ 340
SCE | Forecast
Other Commitments [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)	52.00%
Initial liability cap	$ 3,200
SDG&E
Other Commitments [Line Items]
Initial contribution from ratepayers				$ 1,300

Commitments and Contingencie_10

Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)site	Dec. 31, 2020USD ($)site	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 259,000	$ 259,000
Environmental remediation regulatory assets	247,000	247,000
Expected recovery from incentive mechanism		$ 40,000
Expected recovery from incentive mechanism (as a percent)		90.00%
Recovery through customer rates	207,000	$ 207,000
Recovery through customer rates (as a percent)		100.00%
Alleged criminal and civil violations fine	10
Civil violations penalty	$ 3,500
Injunction period	5 years
Environmental remediation expense		$ 7,000	$ 9,000	$ 8,000
Cost may exceed recorded liability, material sites (up to)		122,000
Cost may exceed recorded liability, immaterial sites		$ 8,000
Clean up (period)		30 years
Expected remediation costs for each of the next four years, low end of range		$ 9,000
Expected remediation costs for each of the next four years, high end of range		$ 20,000
Material sites
Jointly Owned Utility Plant Interests [Line Items]
Identified material sites (number) | site	25	25
Minimum estimated liability		$ 1,000
Recorded estimated minimum liability	$ 255,000	255,000
Material sites | San Onofre
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	173,000	$ 173,000
Immaterial sites
Jointly Owned Utility Plant Interests [Line Items]
Immaterial sites (number) | site		15
Immaterial sites | Minimum
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	4,000	$ 4,000
Mission Canyon Incident
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 8,000	8,000
Environmental remediation expense		$ 7,000

Commitments and Contingencie_11

Commitments and Contingencies (Nuclear Insurance) (Details) - USD ($)	Jan. 05, 2018	Dec. 31, 2020
Palo Verde (nuclear) | SCE
Loss Contingencies [Line Items]
Maximum per incident	$ 65,000,000
Maximum per incident annual	10,000,000
Maximum per incident, prior events	255,000,000
Maximum per incident, prior events, annually	$ 38,000,000
Insurance Claims | SCE
Loss Contingencies [Line Items]
Limit on assessment of retrospective premium adjustments, per year, approximate		$ 30,000,000
Insurance Claims | Palo Verde (nuclear)
Loss Contingencies [Line Items]
Federal loss limit, bodily injury and property damage from nuclear incident		13,800,000,000
Insurance Claims | Palo Verde (nuclear) | SCE and other owners of San Onofre and Palo Verde
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance		1,100,000,000
Insurance Claims | San Onofre
Loss Contingencies [Line Items]
Federal limit on public liability claims from nuclear incident, approximate		560,000,000
Insurance Claims | San Onofre | SCE and other owners of San Onofre and Palo Verde
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance		$ 50,000,000

Commitments and Contingencie_12

Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($) $ in Millions	1 Months Ended
	Aug. 31, 2018	Apr. 30, 2016	Jun. 30, 2010	May 31, 2018	Oct. 31, 2017	Feb. 28, 2017	Sep. 30, 2016
Loss Contingencies [Line Items]
Claim to recover damages incurred							$ 56
SCE and other owners of San Onofre and Palo Verde
Loss Contingencies [Line Items]
Damages sought			$ 142
Litigation settlement		$ 162
Claim to recover damages incurred				$ 45		$ 43
SCE
Loss Contingencies [Line Items]
Damages sought			$ 112
Litigation settlement		124
Legal and other costs		$ 2
Damage award, customer	$ 106
Damage awarded, shareholders	17
Claim to recover damages incurred				35	$ 58	$ 34
Disallowed claim amount				$ 13
SCE | Regulatory balancing and memorandum accounts
Loss Contingencies [Line Items]
Damage award, customer	$ 72

Commitment and Contingencies (U

Commitment and Contingencies (Upstream Lighting Program) (Details) - SCE - USD ($) $ in Millions	1 Months Ended	12 Months Ended	24 Months Ended	36 Months Ended
	Jan. 31, 2021	Dec. 31, 2022	Dec. 31, 2018	Dec. 31, 2019
Upstream Lighting Program
Other Commitments [Line Items]
Incentives paid to manufacturers				$ 91
Upstream Lighting Program | Subsequent event
Other Commitments [Line Items]
Refund of ESPI awards	$ 92
Fines	140
Upstream Lighting Program, ESPI
Other Commitments [Line Items]
Incentives paid to manufacturers			$ 3.5
Upstream Lighting Program, ESPI | Subsequent event
Other Commitments [Line Items]
Refund of ESPI awards	$ 33
Upstream Lighting Program, ESPI | Forecast
Other Commitments [Line Items]
Incentives received		$ 1.3

Leases (Textual) (Details)

Leases (Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
SCE
Lessee, Lease, Description [Line Items]
Lease income	$ 17	$ 18
SCE | Maximum
Lessee, Lease, Description [Line Items]
Term of contract	65 years
SCE | PPA Operating Leases | Minimum
Lessee, Lease, Description [Line Items]
Lease term	3 years
SCE | PPA Operating Leases | Maximum
Lessee, Lease, Description [Line Items]
Lease term	20 years
SCE | Office Leases | Minimum
Lessee, Lease, Description [Line Items]
Lease term	5 years
SCE | Office Leases | Maximum
Lessee, Lease, Description [Line Items]
Lease term	72 years
SCE | Other Operating Leases | Minimum
Lessee, Lease, Description [Line Items]
Lease term	5 years
Term of contract	15 years
SCE | Other Operating Leases | Maximum
Lessee, Lease, Description [Line Items]
Lease term	13 years
EME | Affiliated Entity
Lessee, Lease, Description [Line Items]
Net proceeds	$ 132

Leases (Summary of Lease Paymen

Leases (Summary of Lease Payments) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Lease liabilities	$ 1,085	$ 689
Finance Leases
2021	1
2022	1
2023	1
2024	0
2025	0
Thereafter	5
Total lease payments	8
Amount representing interest	4
Lease liabilities	4	$ 9
PPA Operating Leases
Operating Leases
2021	204
2022	208
2023	159
2024	47
2025	47
Thereafter	443
Total lease payments	1,108
Amount representing interest	203
Lease liabilities	905
Other Operating Leases
Operating Leases
2021	39
2022	32
2023	26
2024	21
2025	18
Thereafter	104
Total lease payments	240
Amount representing interest	60
Lease liabilities	$ 180

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)
Operating leases:
Operating lease right-of-use ("ROU") assets	$ 1,088	$ 693
Current portion of operating lease liabilities	215	80
Operating lease liabilities	$ 873	$ 613
Finance leases included in:
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PublicUtilitiesPropertyPlantAndEquipmentNet	us-gaap:PublicUtilitiesPropertyPlantAndEquipmentNet
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
SCE
Operating leases:
Operating lease right-of-use ("ROU") assets	$ 1,085	$ 689
Current portion of operating lease liabilities	214	79
Operating lease liabilities	871	610
Total operating lease liabilities1	1,085	689
Finance leases included in:
Utility property, plant and equipment, gross	4	14
Accumulated depreciation	0	(5)
Utility property, plant and equipment, net	4	9
Other current liabilities	0	1
Other long-term liabilities	4	8
Total finance lease liabilities	$ 4	9
Number of power contracts amended | contract	1
PPA operating leases	$ 463	$ 0

Leases (Summary of Lease Expens

Leases (Summary of Lease Expense Components) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Lease cost	$ 111	$ 118
Finance lease cost	1	1
Variable lease cost	1,917	2,087
Total lease cost	2,076	2,252
PPA Operating Leases
Lessee, Lease, Description [Line Items]
Total lease cost	2,029	2,206
Other Operating Leases
Lessee, Lease, Description [Line Items]
Lease cost	$ 47	$ 46

Leases (Summary of Other Inform

Leases (Summary of Other Information) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
PPA operating leases	$ 463	$ 0
PPA finance leases, weighted average remaining lease term (in years)	16 years 8 months 1 day	11 years 6 months 3 days
PPA finance leases, weighted average discount rate	11.29%	8.76%
PPA Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 111	$ 118
Financing cash flows from PPA finance leases	$ 1	$ 1
Weighted average remaining lease term (in years)	9 years 9 months	16 years 18 days
Weighted average discount rate	3.12%	4.46%
Other Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 44	$ 44
Other operating leases	$ 58	$ 34
Weighted average remaining lease term (in years)	12 years 1 month 17 days	12 years 8 months 23 days
Weighted average discount rate	3.63%	3.88%

Leases (Schedule of Undiscounte

Leases (Schedule of Undiscounted Cash Flow Expected from Lease Payments) (Details) - SCE $ in Millions	Dec. 31, 2020USD ($)
Lessee, Lease, Description [Line Items]
2021	$ 11
2022	10
2023	8
2024	7
2025	6
Thereafter	128
Total	$ 170

Equity (Equity Contributions) (

Equity (Equity Contributions) (Details) - USD ($) $ in Millions	Dec. 18, 2020	Aug. 31, 2020	Jun. 30, 2020	May 26, 2020	Apr. 29, 2020	Feb. 28, 2020	Dec. 31, 2020
SCE
Class of Stock [Line Items]
Equity investment	$ 325	$ 219	$ 100	$ 319	$ 200	$ 269	$ 1,432

Equity (Preferred and Preferenc

Equity (Preferred and Preference Stock of Utility) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Redemption of preferred and preference stock		$ 308
5.10% Series G (cumulative) | SCE
Class of Stock [Line Items]
Redemption of preferred and preference stock	$ 180
Redemption premium	6
SCE
Class of Stock [Line Items]
Redemption of preferred and preference stock	$ 120	$ 308
SCE | Cumulative preferred stock $100 par value
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 100
Preferred stock, shares authorized		12,000,000
SCE | Cumulative preferred stock $25 par value
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred stock, shares authorized		24,000,000
SCE | No par value
Class of Stock [Line Items]
Preferred stock, shares authorized		50,000,000
SCE | 4.32% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.32%	4.32%
Redemption Price (in dollars per share)	$ 28.75	$ 28.75
SCE | 4.08% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.08%	4.08%
Redemption Price (in dollars per share)	$ 25.50	$ 25.50
SCE | 4.24% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.24%	4.24%
Redemption Price (in dollars per share)	$ 25.80	$ 25.80
SCE | 4.78% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.78%	4.78%
Redemption Price (in dollars per share)	$ 25.80	$ 25.80
SCE | Preference stock
Class of Stock [Line Items]
Shares issued (in shares)			0	0
SCE | 5.10% Series G (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		5.10%
Redemption Price (in dollars per share)		$ 2,500
Redemption premium	$ 9

Equity (Schedule of Preferred a

Equity (Schedule of Preferred and Preference Stock) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Edison International's preferred and preference stock of utility		$ 1,901,000,000	$ 2,193,000,000
SCE | 4.08% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.08%	4.08%
Shares Outstanding		0
Redemption Price (in dollars per share)	$ 25.50	$ 25.50
Dividends Declared per Share (in dollars per share)		$ 0.757
Preferred stock before issuance costs		$ 0	16,000,000
SCE | 4.24% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.24%	4.24%
Shares Outstanding		0
Redemption Price (in dollars per share)	$ 25.80	$ 25.80
Dividends Declared per Share (in dollars per share)		$ 0.786
Preferred stock before issuance costs		$ 0	30,000,000
SCE | 4.32% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.32%	4.32%
Shares Outstanding		0
Redemption Price (in dollars per share)	$ 28.75	$ 28.75
Dividends Declared per Share (in dollars per share)		$ 0.801
Preferred stock before issuance costs		$ 0	41,000,000
SCE | 4.78% Series
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25
Preferred Stock, dividend rate, (as a percent)	4.78%	4.78%
Shares Outstanding		0
Redemption Price (in dollars per share)	$ 25.80	$ 25.80
Dividends Declared per Share (in dollars per share)		$ 0.886
Preferred stock before issuance costs		0	33,000,000
SCE | Preference stock
Class of Stock [Line Items]
Preferred stock before issuance costs		1,945,000,000	2,245,000,000
Less issuance costs		(44,000,000)	(52,000,000)
Edison International's preferred and preference stock of utility		$ 1,901,000,000	2,193,000,000
SCE | 6.25% Series E (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		6.25%
Shares Outstanding		350,000
Redemption Price (in dollars per share)		$ 1,000
Dividends Declared per Share (in dollars per share)		$ 62.500
Preferred stock before issuance costs		$ 350,000,000	350,000,000
SCE | 5.10% Series G (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		5.10%
Shares Outstanding		88,004
Redemption Price (in dollars per share)		$ 2,500
Dividends Declared per Share (in dollars per share)		$ 127.500
Preferred stock before issuance costs		$ 220,000,000	400,000,000
SCE | 5.75% Series H (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		5.75%
Shares Outstanding		110,004
Redemption Price (in dollars per share)		$ 2,500
Dividends Declared per Share (in dollars per share)		$ 143.750
Preferred stock before issuance costs		$ 275,000,000	275,000,000
SCE | 5.375% Series J (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		5.375%
Shares Outstanding		130,004
Redemption Price (in dollars per share)		$ 2,500
Dividends Declared per Share (in dollars per share)		$ 134.375
Preferred stock before issuance costs		$ 325,000,000	325,000,000
SCE | 5.45% Series K (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		5.45%
Shares Outstanding		120,004
Redemption Price (in dollars per share)		$ 2,500
Dividends Declared per Share (in dollars per share)		$ 136.250
Preferred stock before issuance costs		$ 300,000,000	300,000,000
SCE | 5.00% Series L (cumulative)
Class of Stock [Line Items]
Preferred Stock, dividend rate, (as a percent)		5.00%
Shares Outstanding		190,004
Redemption Price (in dollars per share)		$ 2,500
Dividends Declared per Share (in dollars per share)		$ 125
Preferred stock before issuance costs		$ 475,000,000	$ 475,000,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension and PBOP – net loss:
Other	$ 0	$ 0	$ (4)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(69)	(50)
Pension and PBOP – net loss:
Ending balance	(69)	(69)	(50)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Other comprehensive loss before reclassifications	(8)	(14)
Reclassified from accumulated other comprehensive loss	8	5
Other	0	(10)
Change	0	(19)
SCE
Pension and PBOP – net loss:
Other	0	0	(5)
SCE | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(39)	(23)
Pension and PBOP – net loss:
Ending balance	(41)	(39)	$ (23)
SCE | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Other comprehensive loss before reclassifications	(7)	(14)
Reclassified from accumulated other comprehensive loss	5	3
Other	0	(5)
Change	$ (2)	$ (16)

Other Income (Details)

Other Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SCE other income and (expenses):
Total other income and (expenses)	$ 251	$ 193	$ 197
Edison International Parent
SCE other income and (expenses):
Net periodic benefit income – non-service components	(2)	(3)	(2)
Other	(2)	1	5
SCE
SCE other income and (expenses):
Equity allowance for funds used during construction	121	101	104
Increase in cash surrender value of life insurance policies and life insurance benefits	66	39	36
Interest income	20	37	24
Net periodic benefit income – non-service components	102	70	81
Civic, political and related activities and donations	(42)	(46)	(44)
Other expense	(12)	(6)	(7)
Total other income and (expenses)	$ 255	$ 195	$ 194

Supplemental Cash Flows Infor_3

Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash payments (receipts):
Interest, net of amounts capitalized	$ 836	$ 705	$ 595
Tax refunds, net	(34)	(85)	(135)
Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	251	231	200
Preferred and Preference Stock
Non-cash financing and investing activities:
Dividends declared but not paid	11	12	12
SCE
Cash payments (receipts):
Interest, net of amounts capitalized	713	615	552
Tax refunds, net	(50)	(164)	(57)
Non-cash financing and investing activities:
Accrued capital expenditures	730	643	594
SCE | Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	0	200	0
SCE | Preferred and Preference Stock
Non-cash financing and investing activities:
Dividends declared but not paid	$ 11	$ 12	$ 12

Related-Party Transactions (Det

Related-Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Wildfire Insurance Fund expense	$ 336	$ 152	$ 0
SCE
Related Party Transaction [Line Items]
Current insurance receivable due from affiliate	268	0
Wildfire Insurance Fund expense	336	152	0
SCE | Wildfire liability insurance | Wholly-owned subsidiary
Related Party Transaction [Line Items]
Wildfire insurance premiums	176	260	22
Current insurance receivable due from affiliate	268	0
Long-term insurance receivables due from affiliate	0	803
Prepaid Insurance	56	10
Wildfire Insurance Fund expense	$ 189	$ 173	$ 140

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Line Items]
Total operating revenue	$ 3,157	$ 4,644	$ 2,987	$ 2,790	$ 2,970	$ 3,741	$ 2,812	$ 2,824	$ 13,578	$ 12,347	$ 12,657
Operating income (loss)	794	(379)	500	302	287	636	500	352	1,217	1,775	(552)
Net income (loss)	552	(242)	348	213	173	502	422	308	$ 871	$ 1,405	$ (316)
Net income attributable to common shareholders	$ 526	$ (288)	$ 318	$ 183	$ 143	$ 471	$ 392	$ 278
Basic earnings (loss) per share (in dollars per share)	$ 1.39	$ (0.76)	$ 0.85	$ 0.50	$ 0.40	$ 1.36	$ 1.20	$ 0.85	$ 1.98	$ 3.78	$ (1.30)
Diluted earnings (loss) per share (in dollars per share)	1.39	(0.76)	0.85	0.50	0.40	1.35	1.20	0.85	1.98	3.77	(1.30)
Dividends declared per common share (in dollars per share)	$ 0.6625	$ 0.6375	$ 0.6375	$ 0.6375	$ 0.6375	$ 0.6125	$ 0.6125	$ 0.6125	$ 2.5750	$ 2.4750	$ 2.4275
SCE
Quarterly Financial Data [Line Items]
Total operating revenue	$ 3,151	$ 4,635	$ 2,980	$ 2,780	$ 2,958	$ 3,732	$ 2,800	$ 2,816	$ 13,546	$ 12,306	$ 12,611
Operating income (loss)	678	(364)	548	316	325	649	513	358	1,178	1,845	(406)
Net income (loss)	500	(218)	411	249	224	534	449	323	942	1,530	(189)
Net income attributable to common shareholders	474	(264)	381	219	194	503	419	293	$ 810	$ 1,409	$ (310)
Dividends declared per common share (in dollars per share)									$ 2.6030	$ 1.3797	$ 1.3245
Common dividends declared	$ 325	$ 269	$ 269	$ 269	$ 200	$ 200	$ 0	$ 200

Schedule I - Condensed Financ_3

Schedule I - Condensed Financial Information of Parent (Details)	Jan. 01, 2020USD ($)	May 31, 2020USD ($)shares	Dec. 31, 2020USD ($)shares	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)	Dec. 31, 2020USD ($)	Apr. 30, 2020USD ($)	Dec. 31, 2019USD ($)	May 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Assets:
Cash and cash equivalents	$ 68,000,000		$ 87,000,000			$ 68,000,000	$ 68,000,000					$ 87,000,000	$ 68,000,000		$ 87,000,000		$ 68,000,000
Other current assets															224,000,000		188,000,000
Total current assets															5,061,000,000		3,560,000,000
Other long-term assets															860,000,000		648,000,000
Total assets															69,372,000,000		64,382,000,000
Liabilities and equity:
Short-term debt															2,398,000,000		550,000,000
Current portion of long-term debt															1,029,000,000		479,000,000
Other current liabilities															1,612,000,000		1,388,000,000
Total current liabilities															10,277,000,000		5,523,000,000
Long-term debt															19,632,000,000		17,864,000,000
Total equity															15,949,000,000		15,496,000,000		$ 12,652,000,000	$ 13,866,000,000
Total liabilities and equity															$ 69,372,000,000		64,382,000,000
Condensed Statements of Income:
Interest income from affiliates			3,157,000,000	$ 4,644,000,000	$ 2,987,000,000	2,790,000,000	2,970,000,000	$ 3,741,000,000	$ 2,812,000,000	$ 2,824,000,000		13,578,000,000	12,347,000,000	$ 12,657,000,000
Operating, interest and other expenses												12,361,000,000	10,572,000,000	13,209,000,000
Operating income (loss)			794,000,000	(379,000,000)	500,000,000	302,000,000	287,000,000	636,000,000	500,000,000	352,000,000		1,217,000,000	1,775,000,000	(552,000,000)
Income tax benefit												(305,000,000)	(278,000,000)	(739,000,000)
Income (loss) from continuing operations												871,000,000	1,405,000,000	(350,000,000)
Income from discontinued operations, net of tax												0	0	34,000,000
Net income (loss)												739,000,000	1,284,000,000	(423,000,000)
Condensed Statements of Comprehensive Income
Net income (loss)												739,000,000	1,284,000,000	(423,000,000)
Other comprehensive loss, net of tax												0	(9,000,000)	(7,000,000)
Comprehensive income (loss) attributable to Edison International												739,000,000	1,275,000,000	(430,000,000)
Condensed Statements of Cash Flows:
Net cash provided by operating activities												1,263,000,000	(307,000,000)	3,177,000,000
Cash flows from financing activities:
Long-term debt issued												3,073,000,000	3,696,000,000	3,237,000,000
Long-term debt repaid or repurchased												(1,099,000,000)	(82,000,000)	(654,000,000)
Short-term debt borrowed												2,994,000,000	1,750,000,000	0
Repayments of Short-term Debt												(1,126,000,000)	(1,750,000,000)	0
Common stock issued												912,000,000	2,391,000,000	0
Commercial paper and other short-term borrowing (repayments), net												304,000,000	(172,000,000)	(1,611,000,000)
Dividends paid												(928,000,000)	(810,000,000)	(788,000,000)
Net cash provided by financing activities												3,727,000,000	4,903,000,000	82,000,000
Net cash used in investing activities												(4,971,000,000)	(4,678,000,000)	(4,239,000,000)
Cash and cash equivalents, beginning of year	68,000,000					68,000,000						68,000,000
Cash and cash equivalents, end of year			87,000,000				68,000,000					87,000,000	68,000,000
Debt and Credit Agreements
Debt covenant capitalization ratio															0.70
Actual debt to capitalization ratio															0.59
Revolving Credit Facility
Short-term Debt, Other Disclosures [Abstract]
Commitment															$ 6,800,000,000
Outstanding borrowings															1,350,000,000
Amount available															$ 5,291,000,000
Senior notes | 4.125% senior notes due in 2028
Debt and Credit Agreements
Interest rate on debt (as a percent)															4.125%
Senior notes															$ 550,000,000
SCE
Assets:
Cash and cash equivalents	24,000,000		55,000,000			24,000,000	24,000,000					24,000,000	24,000,000		55,000,000		24,000,000
Other current assets															216,000,000		184,000,000
Total current assets															5,017,000,000		3,530,000,000
Other long-term assets															843,000,000		595,000,000
Total assets															69,286,000,000		64,273,000,000
Liabilities and equity:
Short-term debt															2,268,000,000		550,000,000
Current portion of long-term debt															1,029,000,000		79,000,000
Other current liabilities															1,294,000,000		1,298,000,000
Total current liabilities															9,831,000,000		5,059,000,000
Long-term debt															16,499,000,000		15,132,000,000
Total equity															18,650,000,000		17,827,000,000		13,785,000,000	14,672,000,000
Total liabilities and equity															$ 69,286,000,000		64,273,000,000
Condensed Statements of Income:
Interest income from affiliates			3,151,000,000	4,635,000,000	2,980,000,000	2,780,000,000	2,958,000,000	3,732,000,000	2,800,000,000	2,816,000,000		13,546,000,000	12,306,000,000	12,611,000,000
Operating, interest and other expenses												12,368,000,000	10,461,000,000	13,017,000,000
Operating income (loss)			678,000,000	$ (364,000,000)	$ 548,000,000	316,000,000	325,000,000	$ 649,000,000	$ 513,000,000	358,000,000		1,178,000,000	1,845,000,000	(406,000,000)
Income tax benefit												(277,000,000)	(229,000,000)	(696,000,000)
Condensed Statements of Comprehensive Income
Other comprehensive loss, net of tax												(2,000,000)	(11,000,000)	(4,000,000)
Condensed Statements of Cash Flows:
Net cash provided by operating activities												1,427,000,000	(91,000,000)	3,191,000,000
Cash flows from financing activities:
Long-term debt issued												2,676,000,000	2,306,000,000	2,692,000,000
Long-term debt repaid or repurchased												(699,000,000)	(82,000,000)	(639,000,000)
Short-term debt borrowed												2,194,000,000	750,000,000	0
Repayments of Short-term Debt												(326,000,000)	(750,000,000)	0
Commercial paper and other short-term borrowing (repayments), net												175,000,000	(171,000,000)	(520,000,000)
Dividends paid												(1,450,000,000)	(521,000,000)	(909,000,000)
Net cash provided by financing activities												3,699,000,000	4,771,000,000	616,000,000
Net cash used in investing activities												(5,094,000,000)	(4,678,000,000)	$ (4,300,000,000)
Cash and cash equivalents, beginning of year	$ 24,000,000					24,000,000						24,000,000
Cash and cash equivalents, end of year			55,000,000				24,000,000					55,000,000	$ 24,000,000
Basis of Presentation
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)	52.00%												48.00%	45.20%
Wildfire related charge incurred after tax														$ 1,800,000,000
Weighted-average common equity component of total capitalization percent with CPUC waiver														48.70%
Waiver threshold percent (as a percent)														47.70%
Debt and Credit Agreements
Debt covenant capitalization ratio															0.65
Actual debt to capitalization ratio															0.51
Related Party Transactions
Insurance receivable from affiliate															$ 268,000,000		0
SCE | Revolving Credit Facility
Short-term Debt, Other Disclosures [Abstract]
Commitment															5,300,000,000
Outstanding borrowings															1,220,000,000
Amount available															3,921,000,000
SCE | Term loan credit agreement
Debt and Credit Agreements
Debt, face amount															475,000,000
SCE | Multi-year credit facilities
Short-term Debt, Other Disclosures [Abstract]
Commitment															3,000,000,000
Outstanding borrowings															725,000,000
Amount available															2,116,000,000
Edison International | Revolving Credit Facility
Short-term Debt, Other Disclosures [Abstract]
Commitment															1,500,000,000
Outstanding borrowings															130,000,000
Amount available															$ 1,370,000,000
Edison International | Multi-year credit facilities | Revolving Credit Facility
Debt and Credit Agreements
Weighted average interest rate (as a percent)															0.42%
Short-term Debt, Other Disclosures [Abstract]
Commitment															$ 1,500,000,000
Outstanding borrowings															130,000,000
Amount available															1,370,000,000
EME | Affiliated Entity
Related Party Transactions
Net proceeds												132,000,000
Edison International Parent and Other
Liabilities and equity:
Current portion of long-term debt															0		400,000,000
Long-term debt															3,133,000,000		2,732,000,000
Edison International Parent and Other | Multi-year credit facilities
Short-term Debt, Other Disclosures [Abstract]
Outstanding borrowings																	0
Edison International Parent
Assets:
Cash and cash equivalents	$ 15,000,000		3,000,000			15,000,000	15,000,000			97,000,000	$ 97,000,000	15,000,000	$ 97,000,000	$ 97,000,000	3,000,000		15,000,000		$ 97,000,000	$ 524,000,000
Other current assets															43,000,000		260,000,000
Total current assets															46,000,000		275,000,000
Investments in subsidiaries															17,706,000,000		16,530,000,000
Deferred income taxes															675,000,000		608,000,000
Other long-term assets															71,000,000		76,000,000
Total assets															18,498,000,000		17,489,000,000
Liabilities and equity:
Short-term debt															129,000,000		0
Current portion of long-term debt															0		400,000,000
Other current liabilities															636,000,000		481,000,000
Total current liabilities															765,000,000		881,000,000
Long-term debt															3,133,000,000		2,733,000,000
Other long-term liabilities															552,000,000		572,000,000
Total equity															14,048,000,000		13,303,000,000
Total liabilities and equity															$ 18,498,000,000		17,489,000,000
Condensed Statements of Income:
Interest income from affiliates												1,000,000	5,000,000	0
Operating, interest and other expenses												189,000,000	150,000,000	98,000,000
Operating income (loss)												(188,000,000)	(145,000,000)	(98,000,000)
Equity in earnings (loss) of subsidiaries												851,000,000	1,385,000,000	(376,000,000)
Income (loss) before income taxes												663,000,000	1,240,000,000	(474,000,000)
Income tax benefit												(76,000,000)	(44,000,000)	(17,000,000)
Income (loss) from continuing operations												739,000,000	1,284,000,000	(457,000,000)
Income from discontinued operations, net of tax												0	0	34,000,000
Net income (loss)												739,000,000	1,284,000,000	(423,000,000)
Condensed Statements of Comprehensive Income
Net income (loss)												739,000,000	1,284,000,000	(423,000,000)
Other comprehensive loss, net of tax												0	(9,000,000)	(7,000,000)
Comprehensive income (loss) attributable to Edison International												739,000,000	1,275,000,000	(430,000,000)
Condensed Statements of Cash Flows:
Net cash provided by operating activities												1,171,000,000	181,000,000	785,000,000
Cash flows from financing activities:
Long-term debt issued												400,000,000	1,399,000,000	549,000,000
Long-term debt issuance costs												(3,000,000)	(9,000,000)	(4,000,000)
Long-term debt repaid or repurchased											0	(400,000,000)	0
Short-term debt borrowed												800,000,000	1,000,000,000	0
Repayments of Short-term Debt												(800,000,000)	(1,000,000,000)	0
Common stock issued												912,000,000	2,391,000,000	0
Payable due to affiliates												135,000,000	5,000,000	13,000,000
Commercial paper and other short-term borrowing (repayments), net												129,000,000	(1,000,000)	(1,141,000,000)
Payments for stock-based compensation												(3,000,000)	(27,000,000)	(24,000,000)
Receipts from stock option exercises												21,000,000	39,000,000	14,000,000
Dividends paid												(928,000,000)	(810,000,000)	(788,000,000)
Net cash provided by financing activities												263,000,000	2,987,000,000	(1,381,000,000)
Capital contributions to affiliate												(1,446,000,000)	(3,258,000,000)	(10,000,000)
Dividends from affiliate												0	8,000,000	179,000,000
Net cash used in investing activities												(1,446,000,000)	(3,250,000,000)	169,000,000
Net decrease in cash and cash equivalents												(12,000,000)	(82,000,000)	(427,000,000)
Cash and cash equivalents, beginning of year	$ 15,000,000					15,000,000				$ 97,000,000	$ 97,000,000	15,000,000	97,000,000	524,000,000
Cash and cash equivalents, end of year			$ 3,000,000				$ 15,000,000					3,000,000	15,000,000	97,000,000
Basis of Presentation
Cash dividends received from consolidated subsidiaries												1,300,000,000	400,000,000	788,000,000
Debt and Credit Agreements
Debt covenant capitalization ratio															0.70
Equity
Shares issued (in shares) | shares		14,181,882
Proceeds received		$ 800,000,000
Offering expenses		$ 14,000,000
Related Party Transactions
Insurance receivable from affiliate															$ 43,000,000		272,000,000
Current payables due to affiliates															323,000,000		198,000,000
Long-term insurance receivables due from affiliate															68,000,000		73,000,000
Long-term payables due to affiliates															$ 219,000,000		$ 213,000,000
Edison International Parent | Multi-year credit facilities
Debt and Credit Agreements
Weighted average interest rate (as a percent)															0.42%
Short-term Debt, Other Disclosures [Abstract]
Commitment															$ 1,500,000,000
Outstanding borrowings															130,000,000
Amount available															$ 1,370,000,000
Edison International Parent | Senior notes | 4.95% Senior notes due 2025
Debt and Credit Agreements
Debt, face amount																$ 400,000,000
Interest rate on debt (as a percent)																4.95%
Edison International Parent | 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 | Senior notes | 2.40% Senior notes due 2022
Debt and Credit Agreements
Interest rate on debt (as a percent)															2.40%
Senior notes															$ 400,000,000
Edison International Parent | Senior notes | 3.125% Senior notes due 2022
Debt and Credit Agreements
Interest rate on debt (as a percent)															3.125%
Senior notes															$ 300,000,000
Edison International Parent | 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 | Senior notes | 3.55% senior notes due 2024
Debt and Credit Agreements
Debt, face amount															$ 500,000,000
Interest rate on debt (as a percent)															3.55%
Edison International Parent | Senior notes | 5.75% senior notes due in 2027
Debt and Credit Agreements
Interest rate on debt (as a percent)															5.75%
Senior notes															$ 600,000,000
Edison International Parent | Senior notes | Term loan credit agreement
Debt and Credit Agreements
Debt, face amount						$ 800,000,000
Interest rate on debt (as a percent)						1.125%
Edison International Parent | SCE
Related Party Transactions
Expenses from services provided by SCE												2,000,000	2,000,000	2,000,000
Interest expense from loans due to affiliates												$ 4,000,000	$ 5,000,000	$ 5,000,000
Edison International Parent | ATM
Equity
Shares issued (in shares) | shares			0									391,501	2,824,261
Proceeds received												$ 27,000,000	$ 198,000,000
Offering expenses												300,000	2,000,000
Aggregate sale price (up to)																		$ 1,500,000,000
Aggregate sales price remaining															$ 1,300,000,000
Edison International Parent | 401(K)
Equity
Proceeds received												$ 99,000,000	$ 41,000,000
Issuance of new common stock (in shares) | shares												1,644,500	595,200
Edison International Parent | In lieu of dividend payment
Equity
Proceeds received												$ 17,000,000	$ 8,000,000
Issuance of new common stock (in shares) | shares												280,707	125,481
Edison International Parent | Internal Programs, Stock Compensation Awards
Equity
Proceeds received												$ 16,000,000	$ 22,000,000
Issuance of new common stock (in shares) | shares												387,425	423,569
Edison International Parent | Optional cash investments
Equity
Proceeds received												$ 2,000,000
Issuance of new common stock (in shares) | shares												35,999

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 49.7	$ 51.5	$ 53.9
Charged to Costs and Expenses	45.3	32.2	35.2
Charged to Other Accounts	120	0	0
Deductions	27.1	34	37.6
Balance at End of Period	187.9	49.7	51.5
Recorded valuation allowance	31
Capital loss from sale of SoCore Energy
Movement in Valuation and Qualifying Accounts
Recorded valuation allowance	4		4
Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	35.8	32	36.6
Charged to Costs and Expenses	35.9	22.2	19
Charged to Other Accounts	120	0	0
Deductions	16.3	18.4	23.6
Balance at End of Period	175.4	35.8	32
All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	13.9	19.5	17.3
Charged to Costs and Expenses	9.4	10	16.2
Charged to Other Accounts	0	0	0
Deductions	10.8	15.6	14
Balance at End of Period	12.5	13.9	19.5
Tax valuation allowance
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	35	36	28
Charged to Costs and Expenses	0	0	0
Charged to Other Accounts	0	0	8
Deductions	0	1	0
Balance at End of Period	35	35	36
Tax valuation allowance | Non-California state
Movement in Valuation and Qualifying Accounts
Charged to Other Accounts			4
SCE
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	49.4	51.1	53.3
Charged to Costs and Expenses	45	32	35.1
Charged to Other Accounts	120	0	0
Deductions	26.7	33.7	37.3
Balance at End of Period	187.7	49.4	51.1
SCE | Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	35.5	31.6	36
Charged to Costs and Expenses	35.6	22	18.9
Charged to Other Accounts	120	0	0
Deductions	15.9	18.1	23.3
Balance at End of Period	175.2	35.5	31.6
SCE | All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	13.9	19.5	17.3
Charged to Costs and Expenses	9.4	10	16.2
Charged to Other Accounts	0	0	0
Deductions	10.8	15.6	14
Balance at End of Period	$ 12.5	$ 13.9	$ 19.5

Uncategorized Items - eix-20201

Label	Element	Value
Southern California Edison Company [Member] | Woolsey Fire, Class Action [Member] | Subsequent Event [Member]
Loss Contingency Number Of Lawsuits	eix_LossContingencyNumberOfLawsuits	2