Leases (Lease Cost and Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 343	$ 374
Short-term lease cost	4	4
Variable lease cost	133	144
Sublease income	(17)	(20)
Net lease cost	463	502
Operating cash outflows from operating leases	380	412
Right of use assets obtained in exchange for new operating lease liabilities	$ 196	$ 348
Real Estate Lease
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term – real estate	8 years 4 months 13 days	8 years 10 months 13 days
Weighted-average discount rate – real estate leases	2.90%	2.72%