Income Taxes - Expiration of Tax Loss Carryforwards (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 398
Deferred Tax Asset, Interest Carryforward	130
2020 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	398
2021 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	3
2022 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	7
2023 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	7
2024 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	4
2025 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	0
2026-2030 Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	74
Later Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	3
Unlimited Tax Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 300