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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Cash Equivalents | 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) | 2012 |  | 2011 |  | 2012 |  | 2011
Cash reclassified to accounts payable | $ | 247 |  |  | $ | 220 |  |  | $ | 242 |  |  | $ | 220 |
The cash equivalents were as follows:
| Edison International |  | SCE
| December 31,
(in millions) | 2012 |  | 2011 |  | 2012 |  | 2011
Money market funds | $ | 107 |  |  | $ | 114 |  |  | $ | 5 |  |  | $ | 21 |
Inventory Components | Inventory consisted of the following:
| December 31,
(in millions) | 2012 |  | 2011
Materials, supplies and spare parts | $ | 319 |  |  | $ | 326 |
Fuel | 21 |  |  | 24 |
Total inventory | $ | 340 |  |  | $ | 350 |
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 | 12 years to 70 years | 38 years
Distribution plant | 30 years to 60 years | 37 years
Transmission plant | 35 years to 65 years | 46 years
General and Other plant | 5 years to 60 years | 23 years
Reconciliation of the Changes in ARO Liability | A reconciliation of the changes in SCE's ARO liability is as follows:
| December 31,
(in millions) | 2012 |  | 2011
Beginning balance | $ | 2,610 |  |  | $ | 2,507 |
Accretion expense | 161 |  |  | 62 |
Revisions | 12 |  |  | 42 |
Liabilities settled | (1 | ) |  | (1 | )
Ending balance | $ | 2,782 |  |  | $ | 2,610 |
Amortization of deferred financing costs | Amortization of deferred financing costs charged to interest expense is as follows:
| Edison International |  | SCE
| December 31,
(in millions) | 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Amortization of deferred financing costs charged to interest expense | $ | 30 |  |  | $ | 34 |  |  | $ | 30 |  |  | $ | 29 |  |  | $ | 33 |  |  | $ | 30 |
EPS Attributable to Edison International Common Shareholders | EPS attributable to Edison International common shareholders was computed as follows:
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2010
Basic earnings per share – continuing operations: |  |  |  |  |
Income from continuing operations attributable to common shareholders, net of tax | $ | 1,503 |  |  | $ | 1,041 |  |  | $ | 1,092 |
Participating securities dividends | — |  |  | — |  |  | (5 | )
Income from continuing operations available to common shareholders | $ | 1,503 |  |  | $ | 1,041 |  |  | $ | 1,087 |
Weighted average common shares outstanding | 326 |  |  | 326 |  |  | 326 |
Basic earnings per share – continuing operations | $ | 4.61 |  |  | $ | 3.20 |  |  | $ | 3.34 |
Diluted earnings per share – continuing operations: |  |  |  |  |
Income from continuing operations available to common shareholders | $ | 1,503 |  |  | $ | 1,041 |  |  | $ | 1,087 |
Income impact of assumed conversions | (1 | ) |  | (1 | ) |  | 5 |
Income from continuing operations available to common shareholders and assumed conversions | $ | 1,502 |  |  | $ | 1,040 |  |  | $ | 1,092 |
Weighted average common shares outstanding | 326 |  |  | 326 |  |  | 326 |
Incremental shares from assumed conversions | 4 |  |  | 3 |  |  | 3 |
Adjusted weighted average shares – diluted | 330 |  |  | 329 |  |  | 329 |
Diluted earnings per share – continuing operations | $ | 4.55 |  |  | $ | 3.17 |  |  | $ | 3.32 |

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