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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other
 
 
 
 
 
 
 
U.S. government corporations and agencies(1)
$
48

 
$
—

 
$
—

 
$
48

Municipal bonds(2)
271

 
8

 
—

 
279

Other securities(3)
236

 
3

 
(1
)
 
238

Total debt securities
555

 
11

 
(1
)
 
565

Equity securities
166

 
299

 
(6
)
 
459

Cash and cash equivalents
13

 
—

 
—

 
13

Total
$
734

 
$
310

 
$
(7
)
 
$
1,037

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 2019-2049.
(2) 
Maturity dates are 2019-2056.
(3) 
Maturity dates are 2019-2064.
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,
 
2019
 
2018
Proceeds from sales
$
225

 
$
210

Gross realized gains
5

 
4

Gross realized losses
(2
)
 
(3
)