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Employee Benefit Plans (AOCI and Regulatory Assets and Liabilities that have Not been Recognized as Components of Periodic Benefit (Credit) Cost) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Assets and Liabilities Held for Sale |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount included in AOCI |  | $ 173 | $ 170
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | 3,023 | 2,717
Amount included in AOCI |  | 1,800 | 1,700
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | [1] | (156) | (73)
Amount included in AOCI |  | $ (38) | $ 14
[1] | As of December 31, 2023, of the $3.0 billion and $(156) million related to pension benefits and other postretirement benefits, $1.8 billion and $(38) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities, except for $173 million presented in assets and liabilities held for sale. As of December 31, 2022, of the $2.7 billion and $(73) million related to pension benefits and other postretirement benefits, $1.7 billion and $14 million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities, except for $170 million presented in assets and liabilities held for sale.

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- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 + Details
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