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Income Taxes - Schedule of Deferred Income Taxes (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Deferred Tax Assets Liabilities Net [Line Items] |  |
Unrecognized tax benefits | $ 163 | $ 2
Tax Carryforwards And Deductions Expiration Period One [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Tax effect of unspecified carryforward losses and deductions | $ 38 |
Tax Carryforwards And Deductions Expiration Period One [Member] | Minimum [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Expiration period | Dec. 31, 2025 |
Tax Carryforwards And Deductions Expiration Period One [Member] | Maximum [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Expiration period | Dec. 31, 2026 |
Tax Carryforwards And Deductions Expiration Period Two [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Tax effect of unspecified carryforward losses and deductions | $ 486 |
Tax Carryforwards And Deductions Expiration Period Two [Member] | Minimum [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Expiration period | Dec. 31, 2027 |
Tax Carryforwards And Deductions Expiration Period Two [Member] | Maximum [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Expiration period | Dec. 31, 2034 |
Tax Carryforwards And Deductions No Expiration [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Expiration period | Dec. 31, 2035 |
Tax effect of unspecified carryforward losses and deductions | $ 38 |
Tax Carryforwards And Deductions Indefinite [Member] |  |
Deferred Tax Assets Liabilities Net [Line Items] |  |
Tax effect of unspecified carryforward losses and deductions | $ 995 |

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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