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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | $ 2,157 |  | $ 1,990
Gross Unrealized Gains | 510 |  | 523
Gross Unrealized Losses | (32) |  | (14)
Fair Value | 2,635 | [1] | 2,499
Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 491 |  | 519
Equity Securities, FV-NI, Unrealized Gain | 363 |  | 305
Gross Unrealized Losses | (3) |  | (3)
Fair Value | 851 |  | 821
Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 346 |  | 388
Equity Securities, FV-NI, Unrealized Gain | 119 |  | 152
Gross Unrealized Losses | (15) |  | (9)
Fair Value | 450 |  | 531
Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 837 |  | 907
Equity Securities, FV-NI, Unrealized Gain | 482 |  | 457
Gross Unrealized Losses | (18) |  | (12)
Fair Value | 1,301 |  | 1,352
Unrealized Gains (Losses) on Equity Securities still held | 130 |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 683 |  | 555
Gross Unrealized Gains | 12 |  | 27
Gross Unrealized Losses | (8) |  | (1)
Fair Value | 687 |  | 581
Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 637 |  | 528
Gross Unrealized Gains | 16 |  | 39
Gross Unrealized Losses | (6) |  | (1)
Fair Value | 647 |  | 566
Nuclear Decommissioning Trust (NDT) Fund [Member] | Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 8 |  |
Cost | 1,320 |  | 1,083
Gross Unrealized Gains | 28 |  | 66
Gross Unrealized Losses | (14) |  | (2)
Fair Value | 1,334 |  | 1,147
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 226 |  | 238
Gross Unrealized Gains | 18 |  | 28
Gross Unrealized Losses | (2) |  | 0
Fair Value | 242 |  | 266
Rabbi Trust [Member] | Domestic Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 14 |  | 21
Equity Securities, FV-NI, Unrealized Gain | 12 |  | 10
Gross Unrealized Losses | 0 |  | 0
Fair Value | 26 |  | 31
Rabbi Trust [Member] | Equity Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Unrealized Gains (Losses) on Equity Securities still held | 1 |  |
Rabbi Trust [Member] | Government Obligations [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 107 |  | 94
Gross Unrealized Gains | 1 |  | 6
Gross Unrealized Losses | (1) |  | 0
Fair Value | 107 |  | 100
Rabbi Trust [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Cost | 105 |  | 123
Gross Unrealized Gains | 5 |  | 12
Gross Unrealized Losses | (1) |  | 0
Fair Value | 109 |  | 135
Rabbi Trust [Member] | Debt Securities [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 3 |  |
Cost | 212 |  | 217
Gross Unrealized Gains | 6 |  | 18
Gross Unrealized Losses | (2) |  | 0
Fair Value | $ 216 |  | $ 235
[1] | The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2021, which is part of the NDT Fund.

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