Leases (Lease Cost and Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Leases [Abstract]
Operating lease cost	$ 86	$ 82
Short-term lease cost	2	1
Variable lease cost	32	26
Sublease income	(4)	(3)
Net lease cost	116	106
Operating cash outflows from operating leases	98	93
Right of use assets obtained in exchange for new operating lease liabilities	$ 30	$ 36
Weighted average remaining lease term – real estate	7 years 4 months 24 days	7 years 9 months 18 days
Weighted average discount rate – real estate leases	3.71%	3.44%