XML 70 R59.htm IDEA: XBRL DOCUMENT v3.25.3
Trust Investments - Amortized Costs Basis, Gross Unrealized Gains And Fair Value Losses For The Securities Held (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Trust Investments, Cost $ 2,372 [1] $ 2,372 [1] $ 2,311 [2]
Gross Unrealized Gains 592 [1] 592 [1] 495 [2]
Gross Unrealized Losses (105) [1] (105) [1] (160) [2]
Trust Investments, Fair Value 2,859 [1] 2,859 [1] 2,646 [2]
NDT Fund Foreign Currency 24 24 24
Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Trust Investments, Cost 181 181 189
Gross Unrealized Gains 10 10 9
Gross Unrealized Losses (27) (27) (33)
Trust Investments, Fair Value 164 164 165
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 1,427 1,427 1,384
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 14 14 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (88) (88) (122)
Debt Securities, Available-for-Sale, Fair Value 1,353 1,353 1,266
Total Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 173 173 181
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (27) (27) (33)
Debt Securities, Available-for-Sale, Fair Value 146 146 148
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 945 945 927
Equity Securities, Accumulated Gross Unrealized Gain   578 491
Equity Securities, FV-NI, Unrealized Loss   (17) (38)
Equity Securities, Fair Value 1,506 1,506 1,380
Unrealized Gains (Losses) on Equity Securities still held 58 162  
Equity Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Unrealized Gains (Losses) on Equity Securities still held 1 1  
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 578 578 531
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9 9 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (19) (19) (31)
Debt Securities, Available-for-Sale, Fair Value 568 568 503
Corporate Debt Obligations [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 69 69 76
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (8) (8) (11)
Debt Securities, Available-for-Sale, Fair Value 61 61 65
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 849 849 853
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5 5 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (69) (69) (91)
Debt Securities, Available-for-Sale, Fair Value 785 785 763
Government Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 104 104 105
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (19) (19) (22)
Debt Securities, Available-for-Sale, Fair Value 85 85 83
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 432 432 419
Equity Securities, Accumulated Gross Unrealized Gain   171 98
Equity Securities, FV-NI, Unrealized Loss   (9) (29)
Equity Securities, Fair Value 594 594 488
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 513 513 508
Equity Securities, Accumulated Gross Unrealized Gain   407 393
Equity Securities, FV-NI, Unrealized Loss   (8) (9)
Equity Securities, Fair Value 912 912 892
Domestic Equity Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 8 8 8
Equity Securities, Accumulated Gross Unrealized Gain   10 9
Equity Securities, FV-NI, Unrealized Loss   0 0
Equity Securities, Fair Value $ 18 $ 18 $ 17
[1] The NDT Fund Investments table excludes cash and foreign currency of $24 million as of September 30, 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.