Description of Business, Basis of Presentation and Significant Accounting Policies - Aggregate Amortization Expense for Internal and External-Use Software (Detail) - Internal-use software amortization expense $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Acquired Intangible Assets Amortization [Line Items]
Actual 2021	$ 6
2022	5
2023	4
2024	3
2025	3
2026	$ 3

Description of Business, Basis of Presentation and Significant Accounting Policies - Aggregate Amortization Expense for Internal and External-Use Software (Detail) - Internal-use software amortization expense
$ in Millions

12 Months Ended

Dec. 31, 2021

USD ($)

Acquired Intangible Assets Amortization [Line Items]

$ 6

$ 3