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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2020:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)
$
68

 
$
2

 
$
—

 
$
70

Municipal bonds(2)
320

 
12

 
(2
)
 
330

Other securities(3)
276

 
4

 
(11
)
 
269

Total debt securities
664

 
18

 
(13
)
 
669

Equity securities
141

 
185

 
(22
)
 
304

Cash and cash equivalents
14

 
—

 
—

 
14

Total
$
819

 
$
203

 
$
(35
)
 
$
987

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 March 31,
 
 
2020
 
2019
Proceeds from sales
 
$
552

 
$
225

Gross realized gains
 
92

 
5

Gross realized losses
 
(5
)
 
(2
)