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Summary of Significant Accounting Policies | 6 Months Ended
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Jun. 30, 2013
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | Summary of Significant Accounting Policies Organization and Basis of Presentation Edison International is the parent holding company of Southern California Edison Company ("SCE"). SCE is an investor-owned public utility primarily engaged in the business of supplying electricity to an approximately 50,000 square mile area of southern California. Edison International is also the parent company of nonutility subsidiaries that are engaged in competitive businesses related to the delivery or use of electricity. Such competitive business activities are currently not material to report as a separate business segment. These combined notes to the consolidated financial statements apply to both Edison International and SCE unless otherwise described. Edison International's consolidated financial statements include the accounts of Edison International, SCE and other wholly owned and controlled subsidiaries. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to Edison International Parent and Other refer to Edison International Parent and its nonutility subsidiaries. SCE's consolidated financial statements include the accounts of SCE and its wholly owned and controlled subsidiaries. All intercompany transactions have been eliminated from the consolidated financial statements. Edison International's and SCE's significant accounting policies were described in Note 1 of "Notes to Consolidated Financial Statements" included in the 2012 Form 10-K. The same accounting policies are followed for interim reporting purposes, with the exception of accounting principles adopted as of January 1, 2013, discussed below in "—New Accounting Guidance." This quarterly report should be read in conjunction with the financial statements and notes included in the 2012 Form 10-K. Beginning in the fourth quarter of 2012, EME met the definition of a discontinued operation and was classified separately in Edison International's consolidated financial statements. Except as indicated, amounts in the notes to the consolidated financial statements relate to continuing operations of Edison International. See Note 16 for information related to discontinued operations. In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state the consolidated financial position, results of operations and cash flows in accordance with accounting principles generally accepted in the United States of America for the periods covered by this quarterly report on Form 10-Q. The results of operations for the three- and six-month periods ended June 30, 2013 are not necessarily indicative of the operating results for the full year. The December 31, 2012 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Cash Equivalents Cash equivalents included investments in money market funds. Generally, the carrying value of cash equivalents equals the fair value, as these investments have original maturities of three months or less. The cash equivalents were as follows:
| Edison International |  | SCE
(in millions) | June 30, 2013 |  | December 31, 2012 |  | June 30, 2013 |  | December 31, 2012
Money market funds | $ | 72 |  |  | $ | 107 |  |  | $ | 10 |  |  | $ | 5 |
Cash is temporarily invested until required for check clearing from the primary disbursement accounts. 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
(in millions) | June 30, 2013 |  | December 31, 2012 |  | June 30, 2013 |  | December 31, 2012
Cash reclassified to accounts payable | $ | 160 |  |  | $ | 247 |  |  | $ | 158 |  |  | $ | 242 |
Inventory Inventory is stated at the lower of cost or market, cost being determined by the weighted-average cost method for fuel, and the average cost method for materials, supplies and spare parts. Inventory consisted of the following:
(in millions) | June 30, 2013 |  | December 31, 2012
Materials, supplies and spare parts | $ | 244 |  |  | $ | 319 |
Fuel | 23 |  |  | 21 |
Total inventory | $ | 267 |  |  | $ | 340 |
As a result of the permanent retirement of San Onofre, SCE has reclassified $100 million of its inventory to a regulatory asset, see Note 9 for further details. Greenhouse Gas Allowances SCE is allocated greenhouse gas ("GHG") allowances annually which it is then required to submit to quarterly auctions. GHG proceeds from the auction are recorded as a regulatory liability to be refunded to customers. SCE purchases GHG allowances from quarterly auctions or bilateral parties to satisfy its compliance obligations and recovers such costs of GHG from customers. GHG allowances held for use are classified as "Other current assets" on the consolidated balance sheets and are stated at the lower of weighted-average cost or market. Earnings Per Share Edison International computes earnings per share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for each class of common stock and participating security. Edison International's participating securities are stock-based compensation awards payable in common shares, including stock options, performance shares and restricted stock units, which earn dividend equivalents on an equal basis with common shares. Stock options awarded during the period 2003 through 2006 received dividend equivalents. EPS attributable to Edison International common shareholders was computed as follows:
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2013 |  | 2012 |  | 2013 |  | 2012
Basic earnings per share – continuing operations: |  |  |  |  |  |  |
Income (loss) from continuing operations available to common shareholders | $ | (106 | ) |  | $ | 183 |  |  | $ | 152 |  |  | $ | 360 |
Weighted average common shares outstanding | 326 |  |  | 326 |  |  | 326 |  |  | 326 |
Basic earnings per share – continuing operations | $ | (0.33 | ) |  | $ | 0.56 |  |  | $ | 0.47 |  |  | $ | 1.10 |
Diluted earnings per share – continuing operations: |  |  |  |  |  |  |
Income (loss) from continuing operations available to common shareholders | $ | (106 | ) |  | $ | 183 |  |  | $ | 152 |  |  | $ | 360 |
Income impact of assumed conversions | — |  |  | — |  |  | — |  |  | — |
Income (loss) from continuing operations available to common shareholders and assumed conversions | $ | (106 | ) |  | $ | 183 |  |  | $ | 152 |  |  | $ | 360 |
Weighted average common shares outstanding | 326 |  |  | 326 |  |  | 326 |  |  | 326 |
Incremental shares from assumed conversions | — |  | 1 | 8 |  |  | 3 |  |  | 7 |
Adjusted weighted average shares – diluted | 326 |  |  | 334 |  |  | 329 |  |  | 333 |
Diluted earnings per share – continuing operations | $ | (0.33 | ) |  | $ | 0.55 |  |  | $ | 0.47 |  |  | $ | 1.08 |
1 | Due to a loss for the three months ended June 30, 2013, there were no incremental shares in the computation because such shares would be considered antidilutive.
Stock-based compensation awards to purchase 3,266,857 shares of common stock for the three months ended June 30, 2012, and 1,587,370 and 4,928,510 for the six months ended June 30, 2013 and 2012, respectively, were outstanding, but were not included in the computation of diluted earnings per share because the exercise price of the awards was greater than the average market price of the common shares during the respective periods and, therefore, the effect would have been antidilutive. Asset Retirement Obligation SCE is in the process of developing a comprehensive decommissioning plan following its decision to permanently retire San Onofre. See Note 9 for further details. The total asset retirement obligation ("ARO") liability related to San Onofre was revised in the second quarter of 2013 based on an updated decommissioning cost estimate for the retirement of both San Onofre Units 2 and 3. The revised ARO liability at June 30, 2013 related to San Onofre increased $455 million to $2.7 billion. The following table summarizes the changes in SCE's ARO liability, including San Onofre and Palo Verde:
(in millions) | June 30, 2013 |  | December 31, 2012
Beginning balance | $ | 2,782 |  |  | $ | 2,610 |
Accretion expense | 85 |  |  | 161 |
Revisions | 455 |  |  | 12 |
Liabilities settled | — |  |  | (1 | )
Ending balance | $ | 3,322 |  |  | $ | 2,782 |
New Accounting Guidance Accounting Guidance Adopted in 2013 Offsetting Assets and Liabilities In January 2013, the FASB issued accounting standards updates modifying the disclosure requirements about the nature of an entity's rights of offsetting recognized assets and liabilities in the statement of financial position under master netting agreements and similar arrangements associated with derivative instruments, repurchase agreements and securities lending transactions. The guidance requires increased disclosure of the gross and net recognized assets and liabilities, collateral positions and descriptions of setoff rights. Edison International and SCE adopted this guidance effective January 1, 2013. The adoption of this standard did not impact the consolidated income statements, balance sheets or cash flows of Edison International or SCE. Items Reclassified out of Accumulated Other Comprehensive Income In February 2013, the FASB issued an accounting standards update which requires disclosure related to items reclassified out of AOCI. The guidance requires companies to present separately, for each component of other comprehensive income, current period reclassifications and the remainder of the current-period other comprehensive income. In addition, for certain current period reclassifications, an entity is required to disclose the effect of the item reclassified out of AOCI on the respective line item(s) of net income. Edison International and SCE adopted this guidance effective January 1, 2013. See Note 14 for further details. Accounting Guidance Not Yet Adopted In July 2013, the FASB issued an accounting standards update that will require that an unrecognized tax benefit be presented on the balance sheet as a reduction of a deferred tax asset for a net operating loss ("NOL") or tax credit carryforward under certain circumstances. This proposal is effective January 1, 2014 and is not expected to have a material impact on the consolidated financial statements.

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