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Nuclear Decommissioning Trust Fund (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020As of December 31, 2019
(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 $— $— — $17 $— $— — 
U.S. government and federal agency obligations
49 7 — 1268 4 — 11
Federal agency mortgage-backed securities
92 4 — 24100 3 — 24
Commercial mortgage-backed securities
38 2 — 2829 1 1 24
Corporate debt securities144 12 — 12109 6 — 11
Equity securities474 321 1 — 466 324 — — 
Foreign government fixed income securities
6 1 — 105 — — 10
Total$828 $347 $1 $794 $338 $1 
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)20202019
Realized gains$22 $8 
Realized losses(11)(7)
Proceeds from sale of securities318 271