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Nuclear Decommissioning Trust Fund (Tables)

9 Months Ended

Sep. 30, 2021

Regulated Operations [Abstract]

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 September 30, 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			$	29					$	—					$	—					—						$	23					$	—					$	—					—
U.S. government and federal agency obligations			76						4						—						12						70						6						—						10
Federal agency mortgage-backed securities			93						3						—						24						89						4						—						24
Commercial mortgage-backed securities			43						1						—						27						36						2						—						27
Corporate debt securities			116						8						1						14						144						13						—						12
Equity securities			596						439						—						—						521						372						—						—
Foreign government fixed income securities			4						—						—						12						7						1						—						10
Total			$	957					$	455					$	1											$	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.

			Nine months ended September 30,
(In millions)			2021						2020
Realized gains			$	10					$	22
Realized losses			(6)						(11)
Proceeds from sale of securities			424						318

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- Definition

Disclosure related to investments held in a trust fund to pay for the costs of decommissioning facilities.

+ References

No definition available.

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- Definition

Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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