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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | $ 2,867 | $ 2,784
Fair Value | 4,352 | 4,242
Stocks |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 291 | 319
Fair Value | 1,537 | 1,547
Municipal bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 645 | 659
Fair Value | 753 | 766
U.S. government and agency securities |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 1,308 | 1,131
Fair Value | 1,380 | 1,191
Corporate bonds |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 552 | 600
Fair Value | 608 | 659
Short-term investments and receivables/payables |  |
Nuclear Decommissioning Trusts Disclosures |  |
Amortized Cost | 71 | 75
Fair Value | 74 | 79
Repurchase agreement | $ 36 | $ 114

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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