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Nuclear Decommissioning Trust Fund (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023, the trust funds are classified within non-current assets - held-for-sale on the Company's condensed consolidated balance sheet.
 As of September 30, 2023As of December 31, 2022
(In millions, except maturities)Fair ValueUnrealized GainsUnrealized LossesWeighted-average Maturities (In years)Fair ValueUnrealized GainsUnrealized LossesWeighted-average Maturities (In years)
Cash and cash equivalents$25 $— $— — $15 $— $— — 
U.S. government and federal agency obligations
76 — 9 1286 — 5 11
Federal agency mortgage-backed securities
110 — 13 24101 — 11 26
Commercial mortgage-backed securities
31 — 4 2935 — 4 30
Corporate debt securities111 — 11 12114 — 13 12
Equity securities539 390 — — 486 346 3 — 
Foreign government fixed income securities
1 — — 141 — — 17
Total$893 $390 $37 $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 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)20232022
Realized gains$7 $12 
Realized losses(15)(19)
Proceeds from sale of securities280 363