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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 6 Months Ended
Jun. 30, 2020
Public Utilities, General Disclosures [Abstract]  
Schedule of Nuclear Decommissioning Trusts Investments
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 9.
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
 
Cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Estimated
fair
value
At June 30, 2020:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)
$
51

 
$
1

 
$
—

 
$
52

Municipal bonds(2)
327

 
17

 
(1
)
 
343

Other securities(3)
281

 
15

 
(2
)
 
294

Total debt securities
659

 
33

 
(3
)
 
689

Equity securities
143

 
231

 
(12
)
 
362

Cash and cash equivalents
11

 
—

 
—

 
11

Total
$
813

 
$
264

 
$
(15
)
 
$
1,062

At December 31, 2019:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
$
57

 
$
—

 
$
—

 
$
57

Municipal bonds
270

 
12

 
—

 
282

Other securities
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

(1) 
Maturity dates are 2021-2050.
(2) 
Maturity dates are 2020-2056.
(3) 
Maturity dates are 2020-2072.
Schedule of Sales of Securities By Nuclear Decommissioning Trusts
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)
 
 
 
 
 
Three months ended June 30,
 
Six months ended June 30,
 
2020
 
2019
 
2020
 
2019
Proceeds from sales
$
245

 
$
272

 
$
797

 
$
497

Gross realized gains
7

 
8

 
99

 
13

Gross realized losses
(6
)
 
(1
)
 
(11
)
 
(3
)