Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 335	$ 259	$ 687	$ 591
Provision for income tax at federal statutory rate of 35%	117	91	241	207
Increase in income tax from:
State tax, net of federal benefit	6	4	16	11
Property-related	(83)	(138)	(196)	(217)
Change related to uncertain tax positions	(6)	2	(18)	1
Shared-based compensation	(3)	(4)	(46)	(15)
Other	(5)	(6)	(11)	(11)
Total income tax expense (benefit) from continuing operations	$ 26	$ (51)	$ (14)	$ (24)
Effective tax rate	7.80%	(19.70%)	(2.00%)	(4.10%)
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Southern California Edison
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 395	$ 317	$ 787	$ 683
Provision for income tax at federal statutory rate of 35%	138	111	275	239
Increase in income tax from:
State tax, net of federal benefit	9	6	22	15
Property-related	(83)	(138)	(196)	(217)
Change related to uncertain tax positions	0	(1)	(11)	(2)
Shared-based compensation	(1)	(3)	(9)	(11)
Other	(6)	(7)	(12)	(14)
Total income tax expense (benefit) from continuing operations	$ 57	$ (32)	$ 69	$ 10
Effective tax rate	14.40%	(10.10%)	8.80%	1.50%
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Tax abandonment loss			$ 39
State
Increase in income tax from:
Shared-based compensation	$ 4		10	$ 3
State \| Southern California Edison
Increase in income tax from:
Shared-based compensation	$ 1		2	$ 2
Tax abandonment loss			1,130
Federal \| Southern California Edison
Increase in income tax from:
Tax abandonment loss			$ 691
Tax years 2012 to 2014 \| IRS \| Southern California Edison
Increase in income tax from:
Incremental tax benefits related to repair deductions		$ 79
Incremental tax benefits related to repair deductions, before tax		$ 133

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 Reconciliation Adjustment Tax Reserve Adjustment

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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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