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Income Taxes | 3 Months Ended
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Mar. 31, 2017
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes Effective Tax Rate The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision:
| Edison International |  | SCE
| Three months ended March 31,
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Income from continuing operations before income taxes | $ | 352 |  |  | $ | 333 |  |  | $ | 392 |  |  | $ | 367 |
Provision for income tax at federal statutory rate of 35% | 124 |  |  | 117 |  |  | 137 |  |  | 128 |
Increase in income tax from: |  |  |  |  |  |  |
State tax, net of federal benefit | 10 |  |  | 6 |  |  | 13 |  |  | 9 |
Property-related | (113 | ) |  | (79 | ) |  | (113 | ) |  | (79 | )
Change related to uncertain tax positions | (12 | ) |  | (1 | ) |  | (11 | ) |  | (1 | )
Shared-based compensation 1 | (43 | ) |  | (10 | ) |  | (8 | ) |  | (8 | )
Other | (6 | ) |  | (5 | ) |  | (6 | ) |  | (7 | )
Total income tax (benefit) expense from continuing operations | $ | (40 | ) |  | $ | 28 |  |  | $ | 12 |  |  | $ | 42 |
Effective tax rate | (11.4 | )% |  | 8.4 | % |  | 3.1 | % |  | 11.4 | %
1 | Includes state taxes for Edison International and SCE of $6 million and $1 million, respectively, for the three months ended March 31, 2017 and $3 million and $2 million, respectively, for the three months ended March 31, 2016. Refer to Note 1 for further information.
The CPUC requires flow-through ratemaking treatment for the current tax benefit arising from certain property-related and other temporary differences which reverse over time. Flow-through items reduce current authorized revenue requirements in SCE's rate cases and result in a regulatory asset for recovery of deferred income taxes in future periods. The difference between the authorized amounts as determined in SCE's rate cases, adjusted for balancing and memorandum account activities, and the recorded flow-through items also result in increases or decreases in regulatory assets with a corresponding impact on the effective tax rate to the extent that recorded deferred amounts are expected to be recovered in future rates. In March 2017, SCE received the final decision on claims against, and counterclaims of, Mitsubishi Heavy Industries, Inc. and related companies (together, "MHI") from the arbitration tribunal, the International Chamber of Commerce, discussed further in Note 11. San Onofre was permanently shut down on June 7, 2013 as a result of failure of replacement steam generators supplied by MHI. With the resolution of the insurance claim against Nuclear Electric Insurance Limited ("NEIL") in October 2015 and the conclusion of the arbitration proceeding against MHI, a tax abandonment loss of $698 million and $1.14 billion for federal and state income tax purposes, respectively, was claimed in the first quarter of 2017, resulting in a flow-through tax benefit of approximately $39 million impacting the effective tax rate. Due to the tax abandonment loss recognized this quarter, Edison International and SCE both expect to report a federal taxable loss in 2017. In addition, Edison International expects to report a California taxable loss in 2017. Unrecognized Tax Benefits In the first quarter of 2017, Edison International settled all open tax positions with the Internal Revenue Service ("IRS") for taxable years 2007 through 2012. The following table provides a reconciliation of unrecognized tax benefits for 2017 as a result of the audit settlement:
(in millions) | Edison International |  | SCE
Balance at January 1, 2017 | $ | 471 |  |  | $ | 371 |
Tax positions taken during the current year: |  |  |
Increases | 10 |  |  | 10 |
Tax positions taken during a prior year: |  |  |
Increases | 2 |  |  | 2 |
Decreases | (10 | ) |  | (10 | )
Decreases for settlements during the period | (82 | ) |  | (78 | )
Balance at March 31, 2017 | $ | 391 |  |  | $ | 295 |
Tax Disputes Tax Years 2007 – 2012 In the first quarter of 2017, Edison International settled all open tax positions with the IRS for taxable years 2007 through 2012. Edison International previously made cash deposits which are sufficient to settle all outstanding liabilities for this audit cycle. Total liabilities included tax reserves, previously settled issues, and an estimate of associated interest and penalties. Tax years that remain open for examination by the IRS and the California Franchise Tax Board are 2013 – 2015 and 2010 – 2015, respectively. Edison International has settled all open tax position with the IRS for taxable years prior to 2013. Tax years 2003 – 2009 are currently under protest with the California Franchise Tax Board.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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