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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Cash Equivalents | The cash equivalents were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Edison International | ​ | SCE
​ | ​ | September 30, | ​ | December 31, | ​ | September 30, | ​ | December 31,
(in millions) | ​ | 2021 |  | 2020 |  | 2021 |  | 2020
Money market funds | ​ | $ | 463 | ​ | $ | 62 | ​ | $ | 438 | ​ | $ | 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 | ​
​ | ​ | September 30, | ​ | December 31, | ​ | September 30, | ​ | December 31, | ​
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Book balances reclassified to accounts payable | ​ | $ | 33 | ​ | $ | 69 | ​ | $ | 33 | ​ | $ | 69 | ​
Cash, Cash Equivalents and Restricted Cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, |  | December 31,
(in millions) |  | 2021 |  | 2020
Edison International: | ​ |  | ​ | ​ |  | ​
Cash and cash equivalents | ​ | $ | 524 | ​ | $ | 87
Short-term restricted cash1 | ​ |  | 1 | ​ |  | 2
Total cash, cash equivalents, and restricted cash | ​ | $ | 525 | ​ | $ | 89
SCE: | ​ |  | ​ | ​ |  |
Cash and cash equivalents | ​ | $ | 484 | ​ | $ | 55
Short-term restricted cash1 | ​ |  | 1 | ​ |  | 1
Total cash, cash equivalents, and restricted cash | ​ | $ | 485 | ​ | $ | 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
​ | ​ | September 30, 2021 | ​ | September 30, 2020
(in millions) | ​ | Customers | ​ | ​ | All others | ​ | ​ | Total | ​ | Customers | ​ | ​ | All others | ​ | ​ | Total
Beginning balance |  | $ | 254 |  | $ | 16 | ​ | $ | 270 | ​ | $ | 75 |  | $ | 15 | ​ | $ | 90
Plus: current period provision for uncollectible accounts | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Included in operation and maintenance expenses in earning activities1 | ​ |  | 9 | ​ |  | 4 | ​ |  | 13 | ​ |  | 11 | ​ |  | 4 | ​ |  | 15
Included in operation and maintenance expenses in cost-recovery activities2 | ​ | ​ | 52 | ​ | ​ | — | ​ | ​ | 52 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Deferred to regulatory memorandum accounts | ​ |  | 7 | ​ |  | — | ​ |  | 7 | ​ |  | 43 | ​ |  | — | ​ |  | 43
Less: write-offs, net of recoveries | ​ |  | 1 | ​ |  | 3 | ​ |  | 4 | ​ |  | 5 | ​ |  | 2 | ​ |  | 7
Ending balance |  | $ | 321 |  | $ | 17 | ​ | $ | 338 | ³ | $ | 124 |  | $ | 17 | ​ | $ | 141
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine months ended | ​ | Nine months ended
​ | ​ | September 30, 2021 | ​ | September 30, 2020
(in millions) | ​ | Customers | ​ | ​ | All others | ​ | ​ | Total | ​ | Customers | ​ | ​ | All others | ​ | ​ | Total
Beginning balance |  | $ | 175 |  | $ | 13 | ​ | $ | 188 | ​ | $ | 35 |  | $ | 14 | ​ | $ | 49
Plus: current period provision for uncollectible accounts | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Included in operation and maintenance expenses in earning activities1 | ​ |  | 27 | ​ |  | 11 | ​ |  | 38 | ​ |  | 39 | ​ |  | 11 | ​ |  | 50
Included in operation and maintenance expenses in cost-recovery activities2 | ​ | ​ | 112 | ​ | ​ | — | ​ | ​ | 112 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Deferred to regulatory memorandum accounts | ​ |  | 13 | ​ |  | — | ​ |  | 13 | ​ |  | 64 | ​ |  | — | ​ |  | 64
Less: write-offs, net of recoveries | ​ |  | 6 | ​ |  | 7 | ​ |  | 13 | ​ |  | 14 | ​ |  | 8 | ​ |  | 22
Ending balance |  | $ | 321 |  | $ | 17 | ​ | $ | 338 | ³ | $ | 124 |  | $ | 17 | ​ | $ | 141
1 | Earning activities is one of SCE's disaggregated revenue sources. Please refer to Note 7 for further details.
2 | Cost-recovery activities is one of SCE's disaggregated revenue sources. Please refer to Note 7 for further details. This portion of costs from the allowance for uncollectible expenses is recovered through the residential uncollectibles balancing account. See Note 11 for further details.
3 | In June 2021, CPUC issued a decision to allow residential and small business customers of the large investor-owned utilities with arrearages over 60 days old to be enrolled in 24-month payment plans. Accordingly, approximately $199 million of gross account receivables and $93 million of allowance for uncollectible accounts have been reclassified to "Long-term account receivables" on Edison International's and SCE's consolidated balance sheets as of September 30, 2021.
EPS Attributable to Edison International Common Shareholders | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended September 30, |  | Nine months ended September 30,
(in millions, except per-share amounts) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Basic earnings per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net (loss) income attributable to common shareholders | ​ | $ | (341) | ​ | $ | (288) | ​ | $ | 236 | ​ | $ | 213
Participating securities dividends | ​ |  | — | ​ |  | — | ​ |  | — | ​ | ​ | —
Net (loss) income available to common shareholders | ​ | $ | (341) | ​ | $ | (288) | ​ | $ | 236 | ​ | $ | 213
Weighted average common shares outstanding | ​ |  | 380 | ​ |  | 378 | ​ |  | 380 | ​ | ​ | 371
Basic (loss) earnings per share | ​ | $ | (0.90) | ​ | $ | (0.76) | ​ | $ | 0.62 | ​ | $ | 0.57
Diluted (loss) earnings per share: | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​
Net (loss) income attributable to common shareholders | ​ | $ | (341) | ​ | $ | (288) | ​ | $ | 236 | ​ | $ | 213
Participating securities dividends | ​ |  | — | ​ |  | — | ​ |  | — | ​ | ​ | —
Net (loss) income available to common shareholders | ​ | $ | (341) | ​ | $ | (288) | ​ | $ | 236 | ​ | $ | 213
Income impact of assumed conversions | ​ |  | — | ​ |  | — | ​ |  | — | ​ | ​ | —
Net (loss) income available to common shareholders and assumed conversions | ​ | $ | (341) | ​ | $ | (288) | ​ | $ | 236 | ​ | $ | 213
Weighted average common shares outstanding | ​ |  | 380 | ​ |  | 378 | ​ |  | 380 | ​ | ​ | 371
Incremental shares from assumed conversions1 | ​ |  | — | ​ |  | — | ​ |  | — | ​ | ​ | 1
Adjusted weighted average shares – diluted | ​ |  | 380 | ​ |  | 378 | ​ |  | 380 | ​ | ​ | 372
Diluted (loss) earnings per share | ​ | $ | (0.90) | ​ | $ | (0.76) | ​ | $ | 0.62 | ​ | $ | 0.57
1 | Due to the losses reported for the quarters ended September 30, 2021 and September 30, 2020, incremental shares were not included as the effect would be antidilutive.

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