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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Accounting Policies [Abstract] |
Cash Equivalents | 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 | ​
Cash, Cash Equivalents and Restricted Cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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.
Changes in Allowance for Uncollectible Accounts | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
EPS Attributable to Edison International Common Shareholders | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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

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