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Nuclear Decommissioning Trust Fund (Tables)
 3 Months Ended
Mar. 31, 2020
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 well as information about the contractual maturities of those securities.
 As of March 31, 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$21  $—  $—  —  $17  $—  $—  —  
U.S. government and federal agency obligations
57  10  —  1468  4  —  11
Federal agency mortgage-backed securities
93  4  —  24100  3  —  24
Commercial mortgage-backed securities
33  1  1  2629  1  1  24
Corporate debt securities125  5  4  12109  6  —  11
Equity securities368  228  1  —  466  324  —  —  
Foreign government fixed income securities
5  —  —  105  —  —  10
Total$702  $248  $6  $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.
 Three months ended March 31,
(In millions)20202019
Realized gains$2  $3  
Realized losses(5) (2) 
Proceeds from sale of securities112  113