SAN ONOFRE NUCLEAR GENERATING STATION (Tables)

12 Months Ended

Dec. 31, 2020

Regulated Operations [Abstract]

Schedule of Nuclear Decommissioning Trusts

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 12.

NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
	Cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
At December 31, 2020:
Debt securities:
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)	$	64	$	1	$	—	$	65
Municipal bonds(2)	308		18		—		326
Other securities(3)	253		17		—		270
Total debt securities	625		36		—		661
Equity securities	112		254		(2)		364
Cash and cash equivalents	3		—		—		3
Receivables (payables), net	(9)		—		—		(9)
Total	$	731	$	290	$	(2)	$	1,019
At December 31, 2019:
Debt securities:
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	$	57	$	—	$	—	$	57
Municipal bonds	270		12		—		282
Other securities	218		9		(1)		226
Total debt securities	545		21		(1)		565
Equity securities	176		339		(6)		509
Cash and cash equivalents	16		—		—		16
Receivables (payables), net	(8)		—		—		(8)
Total	$	729	$	360	$	(7)	$	1,082

(1)    Maturity dates are 2022-2051.

(2)    Maturity dates are 2021-2056.

(3)    Maturity dates are 2021-2072.

Schedule of Securities Sold

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)
	Years ended December 31,
	2020		2019		2018
Proceeds from sales	$	1,439	$	914	$	890
Gross realized gains	156		24		42
Gross realized losses	(17)		(5)		(10)