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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |
Income from continuing operations before income taxes | $ 949 | $ 1,590 | $ 1,568
Provision for income tax at federal statutory rate of 35% | $ 332 | $ 556 | $ 549
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase in income tax from: |  |  |
Regulatory asset write-off | $ 0 | $ 0 | $ 382
State tax, net of federal benefit | 2 | 29 | 5
Property-related | (439) | (362) | (341)
Change related to uncertain tax positions | (18) | (4) | (67)
Revised San Onofre Settlement Agreement | 25 | 0 | 0
Share-based compensation | (55) | (28) | 0
Effective Income Tax Rate Reconciliation,Tax Cuts and Jobs Act of 2017, Amount | 466 | 0 | 0
Other | (32) | (14) | (42)
Total continuing operations | $ 281 | $ 177 | $ 486
Effective tax rate | 29.60% | 11.10% | 31.00%
State |  |  |
Increase in income tax from: |  |  |
Share-based compensation | $ (11) | $ (4) |
SCE |  |  |
Income Tax Disclosure [Line Items] |  |  |
Income from continuing operations before income taxes | 1,106 | 1,755 | $ 1,618
Provision for income tax at federal statutory rate of 35% | 387 | 614 | 566
Increase in income tax from: |  |  |
Regulatory asset write-off | 0 | 0 | 382
State tax, net of federal benefit | 8 | 43 | 34
Property-related | (439) | (362) | (341)
Change related to uncertain tax positions | (13) | (8) | (94)
Revised San Onofre Settlement Agreement | 25 | 0 | 0
Share-based compensation | (11) | (13) | 0
Effective Income Tax Rate Reconciliation,Tax Cuts and Jobs Act of 2017, Amount | 33 | 0 | 0
Other | (20) | (18) | (40)
Total continuing operations | $ (30) | $ 256 | $ 507
Effective tax rate | (2.70%) | 14.60% | 31.30%
SCE | State |  |  |
Increase in income tax from: |  |  |
Share-based compensation | $ (2) | $ (1) |
SCE | Tax accounting method changes | IRS Examination |  |  |
Increase in income tax from: |  |  |
Federal tax liability | 80 |  |
Tax benefits related to tax accounting method changes, pre-tax | $ 135 |  |

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- Definition The portion of the difference between the total income tax expense (benefit) as reported in the Income Statement for the year/accounting period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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