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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30,Six months ended June 30,
(in millions)2020201920202019
Edison International:
Income from operations before income taxes
$352  $344  $481  $540  
Provision for income tax at federal statutory rate of 21%
74  72  101  113  
Increase (decrease) in income tax from:
 
State tax, net of federal benefit6  2  (7) (5) 
Property-related(69) (74) (147) (143) 
Change related to uncertain tax position1
—  —  (15) —  
Deferred tax re-measurement2
—  —  —  (69) 
2018 GRC Decision—  (80) —  (80) 
Other(7) 2  (12) (6) 
Total income tax expense (benefit)
$4  $(78) $(80) $(190) 
Effective tax rate1.1 %(22.7)%(16.6)%(35.2)%
SCE:
Income from operations before income taxes
$437  $381  $611  $599  
Provision for income tax at federal statutory rate of 21%
92  80  129  126  
Increase (decrease) in income tax from:
State tax, net of federal benefit11  3  (1) (2) 
Property-related(69) (74) (147) (143) 
Change related to uncertain tax positions1
(1) —  (18) —  
Deferred tax re-measurement2
—  —  —  (69) 
2018 GRC Decision—  (80) —  (80) 
Other(7) 3  (12) (5) 
Total income tax expense (benefit)
$26  $(68) $(49) $(173) 
Effective tax rate5.9 %(17.8)%(8.0)%(28.9)%
1 Primarily relates to the re-measurement of uncertain tax positions related to the 2010 – 2012 California state tax filings currently under audit.
2  Relates to changes in the allocation of deferred tax re-measurement between customers and shareholders as a result of a CPUC resolution issued in February 2019. The resolution determined that customers are only entitled to excess deferred taxes which were included when setting rates, while other deferred tax re-measurement belongs to the shareholders.