Income Taxes - Schedule of Reconciliation of Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
U.S. federal income tax expense (benefit) at the statutory rate of 21%	$ (28)	$ 27	$ (151)
State income taxes, net of U.S. federal benefit	183	(8)	(12)
Foreign tax effects
Rate differential		44	14
Other		0	2
Tax credits
Research and development credits	(6)
Nontaxable or nondeductible items
Goodwill impairment	140
Changes in unrecognized tax benefits	9
Net foreign losses with no tax due to valuation allowances		48	122
U.S. charges (benefits) related to foreign tax credits, R&D and foreign derived intangible deduction		(30)	4
Net establishment (release) of uncertain tax positions		6	(3)
Goodwill impairment		0	34
United States and Foreign Tax Expense	$ 1,567	$ 95	$ 10
%
U.S. federal income tax expense (benefit) at the statutory rate of 21%	21.00%	21.00%	21.00%
State income taxes, net of U.S. federal benefit	(137.40%)
Tax credits
Research and development credits	4.50%
Goodwill impairment	(104.80%)
Changes in unrecognized tax benefits	(6.70%)
United States and Foreign Tax Expense	(1173.70%)
Luxembourg
Foreign tax effects
Changes in valuation allowances	$ (53)
Rate differential	11
Other	$ (1)
Foreign tax effects
Changes in valuation allowances	39.60%
Rate differential	(8.00%)
Other	1.10%
Other foreign jurisdictions
Foreign tax effects
Other	$ 57
Foreign tax effects
Other	(42.70%)
United States
Foreign tax effects
Changes in valuation allowances	$ 1,267
Other	1
Effect of cross-border tax laws	$ (13)
Foreign tax effects
Changes in valuation allowances	(949.10%)
Other	(1.00%)
Effect of cross-border tax laws	9.80%
Net establishment of foreign valuation allowances and write-off of deferred taxes
Foreign tax effects
Changes in valuation allowances		$ 4	$ 0
Net establishment of U.S. valuation allowances
Foreign tax effects
Changes in valuation allowances		$ 4	$ 0