Leases (Lease Cost and Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 84	$ 93	$ 262	$ 282
Short-term lease cost	1	1	3	4
Variable lease cost	35	38	99	101
Sublease income	(3)	(3)	(12)	(16)
Net lease cost	$ 117	$ 129	352	371
Operating cash outflows from operating leases			286	310
Right of use assets obtained in exchange for new operating lease liabilities			$ 148	$ 282
Real Estate Lease
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term	8 years 4 months 24 days	9 years	8 years 4 months 24 days	9 years
Weighted-average discount rate, percent	2.87%	2.75%	2.87%	2.75%