Leasing Arrangements - Components of Net Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 5,248	$ 5,016	$ 4,746
Amortization of right-of-use assets	259	309	330
Interest on lease liabilities	34	39	38
Short-term lease cost	21	22	40
Variable lease cost	307	295	218
Sublease income	(193)	(167)	(171)
Total net lease cost	5,676	5,514	5,201
Gain on sale and leaseback transaction, net	$ 0	$ 0	$ (391)