SAN ONOFRE NUCLEAR GENERATING STATION (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2018:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)	$	44	$	—	$	—		$	44
Municipal bonds(1)	245		4		(2		)	247
Other securities(2)	217		2		(3		)	216
Total debt securities	506		6		(5		)	507
Equity securities	172		321		(2		)	491
Cash and cash equivalents	19		—		—			19
Total	$	697	$	327	$	(7	)	$	1,017
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 2018-2048.

⁽²⁾  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 March 31,
	2018			2017
Proceeds from sales(1)	$	210		$	357
Gross realized gains	4			45
Gross realized losses	(3		)	(5		)

⁽¹⁾ 

Excludes securities that are held to maturity.