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Summary of Significant Accounting Policies | 3 Months Ended
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Mar. 31, 2021
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | Note 1.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 an indirect wholly-owned subsidiary of Edison International and 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, its wholly owned and controlled subsidiaries and a variable interest entity of which SCE is the primary beneficiary, SCE Recovery Funding LLC. All intercompany transactions have been eliminated from the consolidated financial statements. Edison International’s and SCE’s significant accounting policies were described in the "Notes to Consolidated Financial Statements" included in Edison International’s and SCE’s combined Annual Report on Form 10-K for the year ended December 31, 2020 (the "2020 Form 10-K"). This quarterly report should be read in conjunction with the financial statements and notes included in the 2020 Form 10-K. In the opinion of management, all adjustments, consisting only of adjustments of a normal recurring nature, have been made that are necessary to fairly state the consolidated financial position, results of operations, and cash flows in accordance with accounting principles generally accepted in the United States ("GAAP") for the periods covered by this quarterly report on Form 10-Q. The results of operations for the three-month periods ended March 31, 2021 are not necessarily indicative of the operating results for the full year. Certain prior period amounts have been conformed to the current period’s presentation. The December 31, 2020 financial statement data was derived from audited financial statements but does not include all disclosures required by GAAP. 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
​ | ​ | March 31, | ​ | December 31, | ​ | March 31, | ​ | December 31,
(in millions) | ​ | 2021 |  | 2020 |  | 2021 |  | 2020
Money market funds | ​ | $ | 360 | ​ | $ | 62 | ​ | $ | 3 | ​ | $ | 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 | ​
​ | ​ | March 31, | ​ | December 31, | ​ | March 31, | ​ | December 31, | ​
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Book balances reclassified to accounts payable | ​ | $ | 59 | ​ | $ | 69 | ​ | $ | 59 | ​ | $ | 69 | ​
​ The following table sets forth the cash, cash equivalents and restricted cash included in the consolidated statements of cash flows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, |  | December 31,
(in millions) |  | 2021 |  | 2020
Edison International: | ​ |  | ​ | ​ |  | ​
Cash and cash equivalents | ​ | $ | 389 | ​ | $ | 87
Short-term restricted cash1 | ​ |  | 1 | ​ |  | 2
Total cash, cash equivalents, and restricted cash | ​ | $ | 390 | ​ | $ | 89
SCE: | ​ |  | ​ | ​ |  |
Cash and cash equivalents | ​ | $ | 25 | ​ | $ | 55
Short-term restricted cash1 | ​ |  | 1 | ​ |  | 1
Total cash, cash equivalents, and restricted cash | ​ | $ | 26 | ​ | $ | 56
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 March 31, 2021, this included the estimated impacts of the COVID-19 pandemic. The following table sets forth the changes in allowance for uncollectible accounts for SCE: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Three months ended
​ | ​ | March 31, 2021 | ​ | March 31, 2020
(in millions) | ​ | Customers | ​ | All others | ​ | Customers | ​ | All others
Beginning balance | ​ | $ | 175 |  | $ | 13 |  | $ | 35 |  | $ | 14
Plus: current period provision for uncollectible accounts | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Included in operation and maintenance expenses | ​ |  | 6 | ​ |  | 4 | ​ |  | 16 | ​ |  | 2
Deferred to regulatory assets | ​ |  | 34 | ​ |  | — | ​ |  | — | ​ |  | —
Less: write-offs, net of recoveries | ​ |  | 5 | ​ |  | 1 | ​ |  | 4 | ​ |  | 3
Ending balance | ​ | $ | 210 |  | $ | 16 |  | $ | 47 |  | $ | 13
​ Revenue Recognition Regulatory Proceedings 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. 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 is recognizing revenue based on the 2020 authorized revenue requirement until a GRC decision is issued. Earnings Per Share Edison 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. See Note 13 for further information. EPS attributable to Edison International common shareholders was computed as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended March 31,
(in millions, except per-share amounts) |  | 2021 |  | 2020
Basic earnings per share: | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to common shareholders | ​ | $ | 259 | ​ | $ | 183
Participating securities dividends | ​ |  | — | ​ | ​ | —
Net income available to common shareholders | ​ | $ | 259 | ​ | $ | 183
Weighted average common shares outstanding | ​ |  | 379 | ​ | ​ | 363
Basic earnings per share | ​ | $ | 0.68 | ​ | $ | 0.50
Diluted earnings per share: | ​ |  | ​ | ​ | ​ | ​
Net income attributable to common shareholders | ​ | $ | 259 | ​ | $ | 183
Participating securities dividends | ​ |  | — | ​ | ​ | —
Net income available to common shareholders | ​ | $ | 259 | ​ | $ | 183
Income impact of assumed conversions | ​ |  | — | ​ | ​ | —
Net income available to common shareholders and assumed conversions | ​ | $ | 259 | ​ | $ | 183
Weighted average common shares outstanding | ​ |  | 379 | ​ | ​ | 363
Incremental shares from assumed conversions | ​ |  | 1 | ​ | ​ | 1
Adjusted weighted average shares – diluted | ​ |  | 380 | ​ | ​ | 364
Diluted earnings per share | ​ | $ | 0.68 | ​ | $ | 0.50
​ In addition to the participating securities discussed above, Edison International also may award stock options, which are payable in common shares and are included in the diluted earnings per share calculation. Stock option awards to purchase 11,412,075 and 3,362,329 shares of common stock for the three months ended March 31, 2021 and 2020, respectively were outstanding, but were not included in the computation of diluted earnings per share because the effect would have been antidilutive. New Accounting Guidance Accounting Guidance 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 amends certain aspects of the EPS guidance. Edison International and SCE have adopted this standard on January 1, 2021 using modified retrospective adoption approach. The adoption of this standard did not have a material impact on Edison International’s and SCE’s financial position or results of operations.

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- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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