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Nuclear Decommissioning Trust Fund (Tables)
 3 Months Ended
Mar. 31, 2022
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 March 31, 2022As of December 31, 2021
(In millions, except maturities)Fair ValueUnrealized GainsUnrealized LossesWeighted-average Maturities (In years)Fair ValueUnrealized GainsUnrealized LossesWeighted-average Maturities (In years)
Cash and cash equivalents$17 $— $— — $33 $— $— — 
U.S. government and federal agency obligations
106 2 4 10112 5 1 10
Federal agency mortgage-backed securities
104 1 3 25100 2 — 25
Commercial mortgage-backed securities
41 — 2 2744 1 — 27
Corporate debt securities116 2 5 14122 7 1 14
Equity securities563 424 — — 593 456 — — 
Foreign government fixed income securities
2 — — 194 — — 13
Total$949 $429 $14 $1,008 $471 $2 
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)20222021
Realized gains$1 $3 
Realized losses(4)(2)
Proceeds from sale of securities161 118