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Income Taxes | 3 Months Ended
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Mar. 31, 2018
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) | 2018 |  | 2017 |  | 2018 |  | 2017
Edison International: |  |  |  |  |  |  |
Income from continuing operations before income taxes | $ | 211 |  |  | $ | 352 |  |  | $ | 310 |  |  | $ | 392 |
Provision for income tax at federal statutory rate of 21% and 35%, respectively 1 | 44 |  |  | 124 |  |  | 65 |  |  | 137 |
Increase in income tax from: |  |  |  |  |  |  |  |  |
State tax, net of federal benefit | (5 | ) |  | 10 |  |  | 1 |  |  | 13 |
Property-related | (69 | ) |  | (113 | ) |  | (69 | ) |  | (113 | )
Change related to uncertain tax positions | — |  |  | (12 | ) |  | (1 | ) |  | (11 | )
Shared-based compensation 2 | — |  |  | (43 | ) |  | — |  |  | (8 | )
Other | (1 | ) |  | (6 | ) |  | (2 | ) |  | (6 | )
Total income tax (benefit) expense from continuing operations | $ | (31 | ) |  | $ | (40 | ) |  | $ | (6 | ) |  | $ | 12 |
Effective tax rate | (14.7 | )% |  | (11.4 | )% |  | (1.9 | )% |  | 3.1 | %
1 | In December 2017, Tax Reform was signed into law. This comprehensive reform of tax law reduces the federal corporate income tax rate from 35% to 21%, effective January 1, 2018.
2 Includes state taxes for Edison International and SCE of $6 million and $1 million, respectively, for the three months ended March 31, 2017. 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. For further information, see Note 10 included in the 2017 Form 10-K. Unrecognized Tax Benefits The following table provides a reconciliation of unrecognized tax benefits:
| Edison International |  | SCE
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Balance at January 1, | $ | 432 |  |  | $ | 471 |  |  | $ | 331 |  |  | $ | 371 |
Tax positions taken during the current year: |  |  |  |  |  |  |
Increases | 8 |  |  | 10 |  |  | 8 |  |  | 10 |
Tax positions taken during a prior year: |  |  |  |  |  |  |
Increases | — |  |  | 2 |  |  | — |  |  | 2 |
Decreases | (3 | ) |  | (10 | ) |  | (3 | ) |  | (10 | )
Decreases for settlements during the period 1 | — |  |  | (82 | ) |  | — |  |  | (78 | )
Balance at March 31, | $ | 437 |  |  | $ | 391 |  |  | $ | 336 |  |  | $ | 295 |
1 In the first quarter of 2017, Edison International settled all open tax positions with the IRS for taxable years 2007 through 2012. Tax Disputes In the first quarter of 2017, Edison International settled all open tax positions with the IRS for taxable years 2007 through 2012. Edison International has previously made cash deposits to cover the estimated tax and interest liability from this audit cycle and expects a $7 million refund of this deposited amount. Tax years that remain open for examination by the IRS and the California Franchise Tax Board are 2014 – 2016 and 2010 – 2016, respectively. Edison International has settled all open tax position with the IRS for taxable years prior to 2013. Tax years 1994 – 2006 are currently in settlement negotiations with the California Franchise Tax Board. While we expect to resolve these tax years within the next twelve months, the impacts cannot be reasonably estimated until further progress has been made. Tax years 2007 – 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 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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