SAN ONOFRE NUCLEAR GENERATING STATION (Tables)

6 Months Ended

Jun. 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 June 30, 2017:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)	$	57	$	—	$	—		$	57
Municipal bonds(2)	256		8		(1		)	263
Other securities(3)	197		3		(1		)	199
Total debt securities	510		11		(2		)	519
Equity securities	196		305		(2		)	499
Cash and cash equivalents	11		—		—			11
Total	$	717	$	316	$	(4	)	$	1,029
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 2018-2047.

(2) Maturity dates are 2017-2047.

(3) 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
(Dollars in millions)
	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Proceeds from sales(1)	$	466		$	111		$	823		$	204
Gross realized gains	79			5			124			8
Gross realized losses	(3		)	(3		)	(8		)	(11		)

(1)

Excludes securities that are held to maturity.