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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30, 2018:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Debt securities issued by the U.S. Treasury and other
 
 
 
 
 
 
 
U.S. government corporations and agencies(1)
$
51

 
$
—

 
$
(1
)
 
$
50

Municipal bonds(2)
259

 
2

 
(3
)
 
258

Other securities(3)
233

 
1

 
(3
)
 
231

Total debt securities
543

 
3

 
(7
)
 
539

Equity securities
166

 
324

 
(4
)
 
486

Cash and cash equivalents
17

 
—

 
—

 
17

Total
$
726

 
$
327

 
$
(11
)
 
$
1,042

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 2018-2056.
(3) 
Maturity dates are 2018-2064.
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
September 30,
 
Nine months ended
September 30,
 
2018
 
2017
 
2018
 
2017
Proceeds from sales
$
216

 
$
259

 
$
703

 
$
1,082

Gross realized gains
3

 
8

 
32

 
132

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