Segments - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($) Segment	Jun. 30, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of divisions represent operating segments | Segment	4
Reportable business segments | Segment	2
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chair, President And Chief Executive Officer [Member]
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	Segment earnings from operations includes revenues less cost of revenues; selling, general and administrative expenses; other operating income and expenses, net; and exclude interest income and expense; other nonoperating income and expenses, net; and income tax expense. The significant expense categories shown below align with the segment-level information regularly provided to the CODM.
Gain on sale of investment		$ 1,300
Noncash asset and portfolio rationalization charge	$ 0	50
West Group [Member]
Segment Reporting Information [Line Items]
Gain on sale of investment		1,300
Transaction expenses		$ 16
Noncash asset and portfolio rationalization charge	$ 50