Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	$ 79
Southern California Edison
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	73
Accounting Standards Update 2015-03 \| Other long-term assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			$ (81)
Accounting Standards Update 2015-03 \| Long-term debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			81
Accounting Standards Update 2015-03 \| Southern California Edison \| Other long-term assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			(77)
Accounting Standards Update 2015-03 \| Southern California Edison \| Long-term debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			$ 77
Accounting for Share-Based Payments \| Pro forma
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax benefit	18
Accounting for Share-Based Payments \| Southern California Edison \| Pro forma
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax benefit	$ 13
Early adoption \| Retained Earnings \| Accounting for Share-Based Payments \| Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in beginning retained earnings		$ 42
Early adoption \| Retained Earnings \| Accounting for Share-Based Payments \| Southern California Edison \| Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in beginning retained earnings		$ 6