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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Reconciliation of Income Tax Expense
The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision:
 
Three months ended September 30,
 
Nine months ended September 30,
(in millions)
2017
 
2016
 
2017
 
2016
Edison International:
 
 
 
 
 
 
 
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-related1
(201
)
 
(79
)
 
(396
)
 
(296
)
Change related to uncertain tax positions
—

 
(5
)
 
(17
)
 
(4
)
Shared-based compensation2
(4
)
 
(2
)
 
(50
)
 
(17
)
Other
(22
)
 
(14
)
 
(35
)
 
(24
)
Total income tax (benefit) expense from continuing operations
$
(69
)
 
$
120

 
$
(83
)
 
$
96

Effective tax rate
(16.0
)%
 
21.0
%
 
(7.4
)%
 
8.3
%
SCE:
 
 
 
 
 
 
 
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-related1
(201
)
 
(79
)
 
(396
)
 
(296
)
Change related to uncertain tax positions
(1
)
 
(7
)
 
(13
)
 
(9
)
Shared-based compensation2
(1
)
 
—

 
(10
)
 
(11
)
Other
(6
)
 
(10
)
 
(18
)
 
(25
)
Total income tax (benefit) expense from continuing operations
$
(35
)
 
$
141

 
$
34

 
$
151

Effective tax rate
(7.6
)%
 
23.2
%
 
2.7
 %
 
11.7
%
1  
Includes incremental tax benefits related to repair deductions and tax accounting method changes which are required to be flowed back to customers. During the third quarter of 2017, SCE recorded $70 million ($118 million pre-tax) of tax benefits related to tax accounting method changes resulting from the filing of SCE's 2016 tax returns. During the second quarter of 2016, SCE recorded $79 million ($133 million pre-tax) for 2012 – 2014 incremental tax benefits related to repair deductions.
2 
Includes state taxes for Edison International and SCE of $10 million and $2 million, respectively, for the nine months ended September 30, 2017. Includes state taxes for Edison International and SCE of $3 million and $2 million, respectively, for the nine months ended September 30, 2016. Refer to Note 1 for further information.
Reconciliation of Unrecognized Tax Benefits
 The following table provides a reconciliation of unrecognized tax benefits for 2017 as a result of the audit settlement:
(in millions)
Edison International
 
SCE
Balance at January 1, 2017
$
471

 
$
371

Tax positions taken during the current year:
 
 
 
   Increases
39

 
39

Tax positions taken during a prior year:
 
 
 
   Increases
1

 
1

   Decreases
(5
)
 
(4
)
   Decreases for settlements during the period
(83
)
 
(78
)
Balance at September 30, 2017
$
423

 
$
329