Leases (Lease Cost and Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Operating lease cost	$ 81	$ 81	$ 163	$ 161
Short-term lease cost	2	2	3	3
Variable lease cost	28	26	54	63
Sublease income	(5)	(2)	(8)	(6)
Net lease cost	$ 106	$ 107	212	221
Operating cash outflows from operating leases			183	189
Right of use assets obtained in exchange for new operating lease liabilities			$ 85	$ 121
Weighted average remaining lease term – real estate	7 years 9 months 18 days	8 years 3 months 18 days	7 years 9 months 18 days	8 years 3 months 18 days
Weighted average discount rate – real estate leases	3.58%	3.21%	3.58%	3.21%