v3.25.1
Trust Investments - Amortized Costs Basis, Gross Unrealized Gains And Fair Value Losses For The Securities Held (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Trust Investments, Cost $ 2,346 [1] $ 2,311 [2]
Gross Unrealized Gains 478 [1] 495 [2]
Gross Unrealized Losses (129) [1] (160) [2]
Trust Investments, Fair Value 2,695 [1] 2,646 [2]
NDT Fund Foreign Currency 30 24
Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Trust Investments, Cost 188 189
Gross Unrealized Gains 7 9
Gross Unrealized Losses (30) (33)
Trust Investments, Fair Value 165 165
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,399 1,384
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (102) (122)
Debt Securities, Available-for-Sale, Fair Value 1,305 1,266
Total Debt Securities [Member] | Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 180 181
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (30) (33)
Debt Securities, Available-for-Sale, Fair Value 150 148
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Equity Securities, Cost 947 927
Equity Securities, Accumulated Gross Unrealized Gain 470 491
Equity Securities, FV-NI, Unrealized Loss (27) (38)
Equity Securities, Fair Value 1,390 1,380
Unrealized Gains (Losses) on Equity Securities still held 17  
Equity Securities [Member] | Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Unrealized Gains (Losses) on Equity Securities still held (1)  
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 552 531
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (26) (31)
Debt Securities, Available-for-Sale, Fair Value 530 503
Corporate Debt Obligations [Member] | Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 75 76
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (10) (11)
Debt Securities, Available-for-Sale, Fair Value 65 65
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 847 853
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (76) (91)
Debt Securities, Available-for-Sale, Fair Value 775 763
Government Debt Securities [Member] | Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 105 105
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (20) (22)
Debt Securities, Available-for-Sale, Fair Value 85 83
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Equity Securities, Cost 437 419
Equity Securities, Accumulated Gross Unrealized Gain 114 98
Equity Securities, FV-NI, Unrealized Loss (20) (29)
Equity Securities, Fair Value 531 488
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Equity Securities, Cost 510 508
Equity Securities, Accumulated Gross Unrealized Gain 356 393
Equity Securities, FV-NI, Unrealized Loss (7) (9)
Equity Securities, Fair Value 859 892
Domestic Equity Securities [Member] | Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Equity Securities, Cost 8 8
Equity Securities, Accumulated Gross Unrealized Gain 7 9
Equity Securities, FV-NI, Unrealized Loss 0 0
Equity Securities, Fair Value $ 15 $ 17
[1] The NDT Fund Investments table excludes cash and foreign currency of $30 million as of March 31, 2025, which is part of the NDT Fund.
[2] The NDT Fund Investments table excludes cash and foreign currency of $24 million as of December 31, 2024, which is part of the NDT Fund.