Leases - Lease expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Leases [Abstract]
Operating lease cost	$ 32	$ 31	$ 90	$ 95
Variable lease cost	11	14	43	42
Total operating lease cost	43	45	133	137
Finance lease cost	$ 4	$ 3	$ 10	$ 9