Nuclear Decommissioning Trust Fund (Tables)

3 Months Ended

Mar. 31, 2021

Summary of aggregate fair values and unrealized gains and losses for the securities held in the trust fund

The following table summarizes the aggregate fair values and unrealized gains and losses for the securities held in the trust funds, as well as information about the contractual maturities of those securities.


	As of March 31, 2021							As of December 31, 2020
(In millions, except maturities)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)
Cash and cash equivalents	$	20	$	—	$	—	—	$	23	$	—	$	—	—
U.S. government and federal agency obligations	73		4		2		12	70		6		—		10
Federal agency mortgage-backed securities	78		3		—		23	89		4		—		24
Commercial mortgage-backed securities	40		1		—		28	36		2		—		27
Corporate debt securities	136		7		1		12	144		13		—		12
Equity securities	555		403		—		—	521		372		—		—
Foreign government fixed income securities	7		—		—		9	7		1		—		10
Total	$	909	$	418	$	3		$	890	$	398	$	—

Summary of proceeds from sales of available-for-sale securities and the related realized gains and losses

The following table summarizes proceeds from sales of available-for-sale securities held in the trust funds and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method.


	Three months ended March 31,
(In millions)	2021		2020
Realized gains	$	3	$	2
Realized losses	(2)		(5)
Proceeds from sale of securities	118		112