Leases (Lease Cost and Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Operating lease cost	$ 84	$ 82	$ 247	$ 243
Short-term lease cost	1	1	4	4
Variable lease cost	31	31	85	94
Sublease income	(2)	(2)	(10)	(8)
Net lease cost	$ 114	$ 112	326	333
Operating cash outflows from operating leases			278	284
Right of use assets obtained in exchange for new operating lease liabilities			$ 135	$ 177
Weighted average remaining lease term – real estate	7 years 9 months 18 days	8 years 1 month 6 days	7 years 9 months 18 days	8 years 1 month 6 days
Weighted average discount rate – real estate leases	3.64%	3.28%	3.64%	3.28%