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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Trust Investments, Cost $ 2,160 $ 2,160 $ 2,157
Gross Unrealized Gains 288 288 510
Gross Unrealized Losses (185) (185) (32)
Trust Investments, Fair Value 2,263 [1] 2,263 [1] 2,635 [2]
NDT Fund Foreign Currency 3 3 2
Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Trust Investments, Cost 219 219 226
Gross Unrealized Gains 6 6 18
Gross Unrealized Losses (28) (28) (2)
Trust Investments, Fair Value 197 197 242
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 1,328 1,328 1,320
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1 1 28
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (131) (131) (14)
Debt Securities, Available-for-Sale, Fair Value 1,198 1,198 1,334
Total Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 205 205 212
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (28) (28) (2)
Debt Securities, Available-for-Sale, Fair Value 177 177 216
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 832 832 837
Equity Securities, Accumulated Gross Unrealized Gain   287 482
Equity Securities, FV-NI, Unrealized Loss   (54) (18)
Equity Securities, Fair Value 1,065 1,065 1,301
Unrealized Gains (Losses) on Equity Securities still held (166) (209)  
Equity Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Unrealized Gains (Losses) on Equity Securities still held (5) (6)  
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 649 649 637
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1 1 16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (63) (63) (6)
Debt Securities, Available-for-Sale, Fair Value 587 587 647
Corporate Debt Obligations [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 91 91 105
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (13) (13) (1)
Debt Securities, Available-for-Sale, Fair Value 78 78 109
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 679 679 683
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 12
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (68) (68) (8)
Debt Securities, Available-for-Sale, Fair Value 611 611 687
Government Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 114 114 107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (15) (15) (1)
Debt Securities, Available-for-Sale, Fair Value 99 99 107
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 334 334 346
Equity Securities, Accumulated Gross Unrealized Gain   55 119
Equity Securities, FV-NI, Unrealized Loss   (37) (15)
Equity Securities, Fair Value 352 352 450
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 498 498 491
Equity Securities, Accumulated Gross Unrealized Gain   232 363
Equity Securities, FV-NI, Unrealized Loss   (17) (3)
Equity Securities, Fair Value 713 713 851
Domestic Equity Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 14 14 14
Equity Securities, Accumulated Gross Unrealized Gain   6 12
Equity Securities, FV-NI, Unrealized Loss   0 0
Equity Securities, Fair Value $ 20 20 $ 26
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]      
Schedule of Trust Investments [Line Items]      
After tax amount of net unrealized gains recognized in AOCI   (76)  
Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
After tax amount of net unrealized gains recognized in AOCI   $ (20)  
[1] The NDT Fund Investments table excludes cash and foreign currency of $3 million as of June 30, 2022, which is part of the NDT Fund.
[2] The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2021, which is part of the NDT Fund.