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Investments (Tables) - Southern California Edison
 6 Months Ended
Jun. 30, 2017
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 (see Note 4 for a discussion of fair value of the trust investments):
 
Longest
Maturity
Dates
 
Amortized Cost
 
Fair Value
(in millions)
 
June 30,
2017
 
December 31,
2016
 
June 30,
2017
 
December 31, 2016
Stocks
—
 
$
304

 
$
319

 
$
1,611

 
$
1,547

Municipal bonds
2054
 
617

 
659

 
737

 
766

U.S. government and agency securities
2067
 
1,209

 
1,131

 
1,288

 
1,191

Corporate bonds
2057
 
523

 
600

 
584

 
659

Short-term investments and receivables/payables1
One-year
 
156

 
75

 
161

 
79

Total
 
 
$
2,809

 
$
2,784

 
$
4,381

 
$
4,242


1
Short-term investments include $32 million and $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by July 3, 2017 and January 4, 2017 as of June 30, 2017 and December 31, 2016, respectively.
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)
 
2017
 
2016
 
2017
 
2016
Balance at beginning of period
 
$
4,352

 
$
4,290

 
$
4,242

 
$
4,331

Gross realized gains
 
13

 
22

 
112

 
75

Gross realized losses
 
—

 
(1
)
 
(16
)
 
(4
)
Unrealized gains, net of losses
 
87

 
72

 
114

 
113

Other-than-temporary impairments
 
(3
)
 
(8
)
 
(4
)
 
(33
)
Interest and dividends
 
31

 
32

 
59

 
60

Income taxes
 
(26
)
 
(24
)
 
(26
)
 
(42
)
Decommissioning disbursements
 
(73
)
 
(38
)
 
(99
)
 
(154
)
Administrative expenses and other
 
—

 
(1
)
 
(1
)
 
(2
)
Balance at end of period
 
$
4,381

 
$
4,344

 
$
4,381

 
$
4,344