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Income Taxes (Operating Loss and Tax Carryforward) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Tax Credit Carryforward [Line Items] |  |  |  |
Loss Carryforwards, Expiring 2017 to 2035 | $ 1,095 |  |  |
Loss Carryforwards, No expiration date | 0 |  |  |
Loss Carryforwards | 1,095 |  |  |
Credit Carryforward, Expiring 2017 to 2035 | 430 |  |  |
Credit Carryforward, No expiration date | 69 |  |  |
Credit Carryforwards | 499 |  |  |
Unrecognized tax benefits | 471 | $ 529 | $ 576 | $ 815
SCE |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Loss Carryforwards, Expiring 2017 to 2035 | 20 |  |  |
Loss Carryforwards, No expiration date | 0 |  |  |
Loss Carryforwards | 20 |  |  |
Credit Carryforward, Expiring 2017 to 2035 | 25 |  |  |
Credit Carryforward, No expiration date | 37 |  |  |
Credit Carryforwards | 62 |  |  |
Unrecognized tax benefits | 371 | $ 353 | $ 441 | $ 532
Loss And Credit Carryforwards |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Unrecognized tax benefits | 176 |  |  |
Loss And Credit Carryforwards | SCE |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Unrecognized tax benefits | $ 82 |  |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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