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Trust Investments - Schedule of Proceeds from the Sales of and Net Realized Gains (Losses) on Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Trust Investments [Line Items]        
Proceeds from Sales of Trust Investments     $ 1,073 $ 1,256
Net Gains (Losses) on Trust Investments $ 62 $ 89 165 191
Nuclear Decommissioning Trust (NDT) Fund [Member]        
Schedule of Trust Investments [Line Items]        
Proceeds from Sales of Trust Investments 335 432 1,050 1,231
Gross Realized Gains 36 30 125 107
Gross Realized Losses (13) (12) (68) (43)
Net Realized Gains (Losses) [1] 23 18 57 64
Unrealized Gain (Loss) on Equity Securities 39 70 108 125
Net Gains (Losses) on Trust Investments 62 88 165 189
Rabbi Trust [Member]        
Schedule of Trust Investments [Line Items]        
Proceeds from Sales of Trust Investments 7 10 23 25
Gross Realized Gains 1 0 1 2
Gross Realized Losses (1) 0 (2) (1)
Net Realized Gains (Losses) [2] 0 (0) (1) 1
Unrealized Gain (Loss) on Equity Securities 0 1 1 1
Net Gains (Losses) on Trust Investments $ 0 $ 1 $ 0 $ 2
[1] The cost of these securities was determined on the basis of specific identification.
[2] The cost of these securities was determined on the basis of specific identification.