SAN ONOFRE NUCLEAR GENERATING STATION (Tables)

9 Months Ended

Sep. 30, 2017

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 8.

NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
	Cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
At September 30, 2017:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)	$	51	$	—	$	—		$	51
Municipal bonds(1)	238		7		—			245
Other securities(2)	207		4		(1		)	210
Total debt securities	496		11		(1		)	506
Equity securities	189		321		(2		)	508
Cash and cash equivalents	27		—		—			27
Total	$	712	$	332	$	(3	)	$	1,041
At December 31, 2016:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies	$	52	$	—	$	—		$	52
Municipal bonds	203		4		(1		)	206
Other securities	141		2		(2		)	141
Total debt securities	396		6		(3		)	399
Equity securities	143		366		(1		)	508
Cash and cash equivalents	119		—		—			119
Total	$	658	$	372	$	(4	)	$	1,026

(1) Maturity dates are 2017-2047.

(2) Maturity dates are 2017-2066.

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,
	2017			2016			2017			2016
Proceeds from sales(1)	$	259		$	282		$	1,082		$	486
Gross realized gains	8			24			132			32
Gross realized losses	(3		)	(3		)	(11		)	(14		)

(1)

Excludes securities that are held to maturity.