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Summary of Significant Accounting Policies Revision to Consolidated Statement of Cash Flow (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013 As Reported | Dec. 31, 2013 As Reported | Mar. 31, 2014 Adjustment | Jun. 30, 2014 Adjustment | Sep. 30, 2013 Adjustment | Dec. 31, 2013 Adjustment | Sep. 30, 2014 Southern California Edison | Sep. 30, 2013 Southern California Edison | Dec. 31, 2013 Southern California Edison | Sep. 30, 2013 Southern California Edison As Reported | Dec. 31, 2013 Southern California Edison As Reported | Sep. 30, 2013 Southern California Edison Adjustment | Dec. 31, 2013 Southern California Edison Adjustment
Regulatory impacts of net nuclear decommissioning trust earnings | $ 100 | $ 82 | $ 76 | $ 265 | $ 312 |  |  | $ (183) | $ (236) | $ 100 | $ 82 | $ 76 | $ 265 | $ 312 | $ (183) | $ (236)
Net cash provided by operating activities | 2,027 | 2,070 | 2,967 | 2,253 | 3,203 | 67 | 5 | (183) | (236) | 2,513 | 2,163 | 3,048 | 2,346 | 3,284 | (183) | (236)
Purchases of nuclear decommissioning trust investments | (5,951) | (4,674) | (5,715) | (4,857) | (5,951) |  |  | 183 | 236 | (5,951) | (4,674) | (5,715) | (4,857) | (5,951) | 183 | 236
Net cash used by investing activities | $ 2,936 | $ 2,905 | $ 3,572 | $ 3,088 | $ 3,808 | $ 67 | $ 5 | $ (183) | $ (236) | $ 2,908 | $ 2,882 | $ 3,547 | $ 3,065 | $ 3,783 | $ (183) | $ (236)

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- Definition The regulatory impacts of the realized gains and losses and earnings associated with the nuclear decommissioning trust investments reflected in proceeds and purchases of nuclear decommissioning trust investments in investing activities. + References No definition available. + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash outflow for the purchase of investments that will be held in a decommissioning trust fund. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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