Income Taxes - Expiration of Tax Credit Carryforwards (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 227
2020 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	227
2021 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	10
2022 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	18
2023 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	22
2024 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	7
2025 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	7
2026-2030 Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	58
Later Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	56
Unlimited Tax Loss Carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 49