Effective Tax Rate Excluding Income Attributable to Noncontrolling Interests

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Sum of operating profit and nonoperating income or expense before income taxes and noncontrolling interest.

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Income Tax Disclosures [Line Items]

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Income Tax Reconciliation Adjustment Tax Reserve Adjustment

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The portion of the difference between the total income tax expense (benefit) as reported in the Income Statement for the year/accounting period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates.

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Tax Adjustments Settlements and Unusual Provisions, Before Tax

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 432	$ 571			$ 1,119	$ 1,162
Provision for income tax at federal statutory rate of 35%	151	200			392	407
Increase in income tax from:
State tax, net of federal benefit	7	20			23	30
Property-related	(201)	(79)			(396)	(296)
Change related to uncertain tax positions	0	(5)			(17)	(4)
Shared-based compensation	(4)	(2)			(50)	(17)
Other	(22)	(14)			(35)	(24)
Total income tax (benefit) expense from continuing operations	$ (69)	$ 120			$ (83)	$ 96
Effective tax rate	(16.00%)	21.00%			(7.40%)	8.30%
Federal statutory rate	35.00%	35.00%			35.00%	35.00%
State
Increase in income tax from:
Shared-based compensation					$ 10	$ 3
Southern California Edison
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 462	$ 607			1,249	1,291
Provision for income tax at federal statutory rate of 35%	162	212			437	452
Increase in income tax from:
State tax, net of federal benefit	12	25			34	40
Property-related	(201)	(79)			(396)	(296)
Change related to uncertain tax positions	(1)	(7)			(13)	(9)
Shared-based compensation	(1)	0			(10)	(11)
Other	(6)	(10)			(18)	(25)
Total income tax (benefit) expense from continuing operations	$ (35)	$ 141			$ 34	$ 151
Effective tax rate	(7.60%)	23.20%			2.70%	11.70%
Federal statutory rate	35.00%	35.00%			35.00%	35.00%
Tax abandonment loss				$ 39
Southern California Edison \| State
Increase in income tax from:
Shared-based compensation					$ 2	$ 2
Tax abandonment loss				1,130
Southern California Edison \| Federal
Increase in income tax from:
Tax abandonment loss				$ 691
Southern California Edison \| Tax accounting method changes \| IRS
Increase in income tax from:
Incremental tax benefits related to repair deductions	$ 70
Incremental tax benefits related to repair deductions, before tax	$ 118
Southern California Edison \| Tax years 2012 to 2014 \| IRS
Increase in income tax from:
Incremental tax benefits related to repair deductions			$ 79
Incremental tax benefits related to repair deductions, before tax			$ 133