Stock-based compensation - Schedule of Stock-based Compensation Expense by Award Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 23	$ 29	$ 53	$ 69
Time-Based Restricted Stock Unit Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	16	19	31	35
Performance-Based Restricted Stock Unit Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	(2)	3	0	5
Time-Based Long-Term Incentive Plant (LTIP) Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	11	9	20	23
Performance-Based Long-Term Incentive Plan (LTIP) Awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ (2)	$ (2)	$ 2	$ 6