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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs | $ 81 |
Accounting standards update on debt issuance costs | Other long-term assets |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs |  | $ (81)
Accounting standards update on debt issuance costs | Long-term debt |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs |  | 81
Accounting standards update to simplify the accounting for share-based payments | Early adoption using modified retrospective approach |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Income tax expense | 28 |
Accounting standards update to simplify the accounting for share-based payments | Retained Earnings | Early adoption using modified retrospective approach |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect adjustment |  | 42
SCE |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs | 71 |
SCE | Other long-term assets |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs | 7 | 7
SCE | Long-term debt |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs | 71 | 77
SCE | Accounting standards update on debt issuance costs | Other long-term assets |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs |  | (77)
SCE | Accounting standards update on debt issuance costs | Long-term debt |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs |  | 77
SCE | Accounting standards update to simplify the accounting for share-based payments | Early adoption using modified retrospective approach |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Income tax expense | $ 13 |
SCE | Accounting standards update to simplify the accounting for share-based payments | Retained Earnings | Early adoption using modified retrospective approach |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect adjustment |  | $ 6

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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