Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of operating segments | Segment	1
Contract with customer, assets	$ 20,000,000	$ 20,000,000
Reimbursements from customers	203,000,000	181,000,000	$ 199,000,000
Impairments of goodwill	0	0	0
Net transaction losses	$ 29,000,000	$ (24,000,000)	$ (15,000,000)
Minimum
Significant Accounting Policies [Line Items]
Other intangible assets, useful lives	3 years
Maximum
Significant Accounting Policies [Line Items]
Other intangible assets, useful lives	25 years