Stock-based compensation - Summary of Stock-based Compensation Expense by Award Type (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		$ 29	$ 6	$ 69	$ 11
Time-Based Restricted Stock Unit Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		19	1	35	1
Performance-Based Restricted Stock Unit Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		3	0	5	0
Time-Based Long-Term Incentive Plant (LTIP) Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 7	9	0	23	0
Performance-Based Long-Term Incentive Plan (LTIP) Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 13	(2)	0	6	0
BGLH Restricted Class B Units
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		0	3	0	6
Management Profits Interests Class C Units
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		$ 0	$ 2	$ 0	$ 4