Income Taxes - Income Tax Paid (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
Federal	$ 14
Foreign:
Total	121	$ 50	$ 169
California
Income Tax Paid, by Individual Jurisdiction [Line Items]
State	17
Illinois
Income Tax Paid, by Individual Jurisdiction [Line Items]
State	(8)
Other state and local
Income Tax Paid, by Individual Jurisdiction [Line Items]
State	2
Australia
Foreign:
Total Foreign	68
Canada
Foreign:
Total Foreign	6
New Zealand
Foreign:
Total Foreign	6
Foreign Tax Jurisdiction, Other
Foreign:
Total Foreign	$ 16