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Related party transactions - Related Party Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction [Line Items]
Revenues	$ 363	$ 354	$ 1,075	$ 1,096
Related Party
Related Party Transaction [Line Items]
Revenues	77	74	235	246
Management fee revenues | Related Party
Related Party Transaction [Line Items]
Revenues	61	59	181	176
Add-on services | Related Party
Related Party Transaction [Line Items]
Revenues	2	3	8	9
Reimbursable revenues | Related Party
Related Party Transaction [Line Items]
Revenues	5	3	21	10
Lease revenue | Related Party
Related Party Transaction [Line Items]
Revenues	9	9	25	46
Other | Related Party
Related Party Transaction [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 5

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