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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) (Tables)
 12 Months Ended
Dec. 31, 2018
Regulated Operations [Abstract]  
Schedule of Nuclear Decommissioning Trusts The following table shows the fair values and gross unrealized gains and losses for the securities held in the NDT. We provide additional fair value disclosures for the NDT in Note 12.
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
 
Cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Estimated
fair
value
At December 31, 2018:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other
 
 
 
 
 
 
 
U.S. government corporations and agencies(1)
$
52

 
$
1

 
$
—

 
$
53

Municipal bonds(2)
266

 
4

 
(1
)
 
269

Other securities(3)
238

 
1

 
(5
)
 
234

Total debt securities
556

 
6

 
(6
)
 
556

Equity securities
168

 
253

 
(10
)
 
411

Cash and cash equivalents
7

 
—

 
—

 
7

Total
$
731

 
$
259

 
$
(16
)
 
$
974

At December 31, 2017:
 

 
 

 
 

 
 

Debt securities:
 

 
 

 
 

 
 

Debt securities issued by the U.S. Treasury and other
 
 
 
 
 
 
 
U.S. government corporations and agencies
$
54

 
$
—

 
$
—

 
$
54

Municipal bonds
245

 
7

 
(2
)
 
250

Other securities
215

 
3

 
(1
)
 
217

Total debt securities
514

 
10

 
(3
)
 
521

Equity securities
171

 
326

 
(1
)
 
496

Cash and cash equivalents
16

 
—

 
—

 
16

Total
$
701

 
$
336

 
$
(4
)
 
$
1,033

(1) 
Maturity dates are 2019-2048.
(2) 
Maturity dates are 2019-2056.
(3) 
Maturity dates are 2019-2064.
Schedule of Securities Sold The following table shows the proceeds from sales of securities in the NDT and gross realized gains and losses on those sales.
SALES OF SECURITIES IN THE NDT
(Dollars in millions)
 
Years ended December 31,
 
2018
 
2017
 
2016
Proceeds from sales
$
890

 
$
1,314

 
$
1,134

Gross realized gains
42

 
157

 
111

Gross realized losses
(10
)
 
(14
)
 
(29
)