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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |
1 Reflected in "Other current assets" on Edison International's and SCE's consolidated balance sheets.
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.

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