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Other Investments (Tables) (Southern California Edison)
 6 Months Ended
Jun. 30, 2014
Southern California Edison
  
Investment [Line Items]  
Amortized Cost and Fair Value of the Trust Investments
The following table sets forth amortized cost and fair value of the trust investments:
 
Longest
Maturity
Dates
 
Amortized Cost
 
Fair Value
(in millions)
 
June 30,
2014
 
December 31,
2013
 
June 30,
2014
 
December 31, 2013
Stocks
—
 
$
683

 
$
656

 
$
2,332

 
$
2,208

Municipal bonds
2051
 
688

 
675

 
812

 
756

U.S. government and agency securities
2044
 
824

 
902

 
881

 
947

Corporate bonds
2054
 
339

 
208

 
390

 
241

Short-term investments and receivables/payables
One-year
 
312

 
329

 
325

 
342

Total
 
 
$
2,846

 
$
2,770

 
$
4,740

 
$
4,494
Summary of Changes in the Fair Value of Trust
The following table sets forth a summary of changes in the fair value of the trust:
 
 
Three months ended June 30,
 
Six months ended June 30,
(in millions)
 
2014
 
2013
 
2014
 
2013
Balance at beginning of period
 
$
4,587

 
$
4,246

 
$
4,494

 
$
4,048

Gross realized gains
 
28

 
137

 
38

 
142

Gross realized losses
 
—

 
(1
)
 
—

 
(2
)
Unrealized gains (losses), net
 
107

 
(185
)
 
169

 
(9
)
Other-than-temporary impairments
 
(3
)
 
(21
)
 
(6
)
 
(29
)
Interest, dividends, contributions and other
 
21

 
5

 
45

 
31

Balance at end of period
 
$
4,740

 
$
4,181

 
$
4,740

 
$
4,181