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Nuclear Decommissioning Trust Fund (Tables)
 12 Months Ended
Dec. 31, 2023
Regulated Operations [Abstract]  
Summary of Aggregate Fair Values and Unrealized Gains And Losses (Including Other-Than-Temporary Impairments) for the Securities Held in The Nuclear Decommissioning Trust Fund
The following table summarizes the aggregate fair values and unrealized gains and losses for the securities held in the trust funds as of December 31, 2022, as well as information about the contractual maturities of those securities as of that date.
 As of December 31, 2022
(In millions, except otherwise noted)
Fair
Value
Unrealized
Gains
Unrealized
Losses
Weighted-
average
maturities
(in years)
Cash and cash equivalents$15 $— $— — 
U.S. government and federal agency obligations
86 — 5 11
Federal agency mortgage-backed securities
101 — 11 26
Commercial mortgage-backed securities
35 — 4 30
Corporate debt securities114 — 13 12
Equity securities486 346 3 — 
Foreign government fixed income securities
1 — — 17
Total$838 $346 $36  
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 and the related realized gains and losses from these sales for the ten months ended October 31, 2023, and for the years ended December 31, 2022 and 2021. The cost of securities sold was determined using the specific identification method.
(In millions)202320222021
Realized gains$11 $14 $47 
Realized losses(19)(25)(9)
Proceeds from sale of securities355 448 710