Leases (Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities
Operating cash flows from operating leases	$ 4,679	$ 4,580	$ 4,496
Supplemental Lease Cash Flow Disclosures
Operating lease right-of-use assets obtained in exchange for new operating lease obligations	$ 3,751	$ 3,396	$ 4,057