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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Cash Equivalents | The cash equivalents were as follows:
| Edison International |  | SCE
| December 31,
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Money market funds | $ | 1,024 |  |  | $ | 41 |  |  | $ | 483 |  |  | $ | 18 |
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) | 2017 |  | 2016 |  | 2017 |  | 2016
Book balances reclassified to accounts payable | $ | 64 |  |  | $ | 138 |  |  | $ | 63 |  |  | $ | 136 |
Estimated Useful Lives (Authorized by the CPUC) and Weighted-Average Useful Lives of Property, Plant and Equipment | Estimated useful lives (authorized by the CPUC) 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 | 37 years
Distribution plant | 20 years to 60 years | 43 years
Transmission plant | 40 years to 65 years | 52 years
General plant and other | 5 years to 60 years | 22 years
Reconciliation of the Changes in ARO Liability | The following table summarizes the changes in SCE's ARO liability, including San Onofre Nuclear Generating Station ("San Onofre") and Palo Verde:
| December 31,
(in millions) | 2017 |  | 2016
Beginning balance | $ | 2,586 |  |  | $ | 2,762 |
Accretion 1 | 166 |  |  | 157 |
Revisions | 376 |  |  | (165 | )
Liabilities settled | (236 | ) |  | (168 | )
Ending balance | $ | 2,892 |  |  | $ | 2,586 |
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) | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Amortization of deferred financing costs charged to interest expense | $ | 30 |  |  | $ | 31 |  |  | $ | 33 |  |  | $ | 27 |  |  | $ | 27 |  |  | $ | 28 |
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) | 2017 |  | 2016 |  | 2015
Basic earnings per share – continuing operations: |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ | 565 |  |  | $ | 1,299 |  |  | $ | 985 |
Participating securities dividends | — |  |  | — |  |  | (1 | )
Income from continuing operations available to common shareholders | $ | 565 |  |  | $ | 1,299 |  |  | $ | 984 |
Weighted average common shares outstanding | 326 |  |  | 326 |  |  | 326 |
Basic earnings per share – continuing operations | $ | 1.73 |  |  | $ | 3.99 |  |  | $ | 3.02 |
Diluted earnings per share – continuing operations: |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ | 565 |  |  | $ | 1,299 |  |  | $ | 985 |
Participating securities dividends | — |  |  | — |  |  | (1 | )
Income from continuing operations available to common shareholders | $ | 565 |  |  | $ | 1,299 |  |  | $ | 984 |
Income impact of assumed conversions | — |  |  | 1 |  |  | 1 |
Income from continuing operations available to common shareholders and assumed conversions | $ | 565 |  |  | $ | 1,300 |  |  | $ | 985 |
Weighted average common shares outstanding | 326 |  |  | 326 |  |  | 326 |
Incremental shares from assumed conversions | 2 |  |  | 4 |  |  | 3 |
Adjusted weighted average shares – diluted | 328 |  |  | 330 |  |  | 329 |
Diluted earnings per share – continuing operations | $ | 1.72 |  |  | $ | 3.94 |  |  | $ | 2.99 |

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