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Summary of Significant Accounting Policies (SCE Dividend) (Details) - SCE - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Jul. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  | 48.00% |
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) |  |  | 37 months |
After-tax charge excused from capital structure |  | $ 448 |  | $ 448
Weighted-average common equity component of total capitalization percent |  |  | 49.70% |
Capacity to pay additional dividends |  |  | $ 459 |
Restriction on net assets |  |  | $ 13,300 |
Waiver threshold percent |  |  | 47.00% |
Subsequent event |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Weighted-average common equity component of total capitalization percent | 47.00% |  |  |
Dividends | $ 200 |  |  |

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- Definition This element represents the authorized percentage of weighted-average common equity component of total capitalization required to distribute the dividend. + References No definition available. + Details
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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