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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)
$
57

 
$
—

 
$
—

 
$
57

Municipal bonds(2)
270

 
12

 
—

 
282

Other securities(3)
218

 
9

 
(1
)
 
226

Total debt securities
545

 
21

 
(1
)
 
565

Equity securities
176

 
339

 
(6
)
 
509

Cash and cash equivalents
8

 
—

 
—

 
8

Total
$
729

 
$
360

 
$
(7
)
 
$
1,082

At December 31, 2018:
 

 
 

 
 

 
 

Debt securities:
 

 
 

 
 

 
 

Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
$
52

 
$
1

 
$
—

 
$
53

Municipal bonds
266

 
4

 
(1
)
 
269

Other securities
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

(1) 
Maturity dates are 2021-2050.
(2) 
Maturity dates are 2020-2056.
(3) 
Maturity dates are 2020-2072.
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,
 
2019
 
2018
 
2017
Proceeds from sales
$
914

 
$
890

 
$
1,314

Gross realized gains
24

 
42

 
157

Gross realized losses
(5
)
 
(10
)
 
(14
)