Leasing Activity, Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Fixed lease expense – operating leases	$ 251	$ 253
Variable lease expense	71	73
Other	(16)	(10)
Total lease costs	$ 306	$ 316