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Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Unrecognized prior service cost (credit) to be amortized | $ (1) |  |
Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Net loss (gain) | 0 | $ 6 | $ 7
Settlement charges | 6 | 0 | 0
Amortization of net loss | (10) | (10) | (15)
Total recognized in other comprehensive loss | (16) | (4) | (8)
Total recognized in expense and other comprehensive loss | 76 | 97 | 110
Unrecognized net loss to be amortized | 8 |  |
Unrecognized prior service cost (credit) to be amortized | 3 |  |
Amount of net loss expected to be reclassified from other comprehensive loss | 8 |  |
SCE | Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Unrecognized prior service cost (credit) to be amortized | (1) |  |
SCE | Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Net loss (gain) | 3 | 4 | (9)
Settlement charges | 0 | 0 | 0
Amortization of net loss | (6) | (6) | (9)
Total recognized in other comprehensive loss | (3) | (2) | (18)
Total recognized in expense and other comprehensive loss | 72 | $ 91 | $ 93
Unrecognized net loss to be amortized | 6 |  |
Unrecognized prior service cost (credit) to be amortized | 3 |  |
Amount of net loss expected to be reclassified from other comprehensive loss | $ 6 |  |

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 + Details
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