Leases (Lessee Components of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Property leases
Operating lease expense	$ 214	$ 168	$ 419	$ 329
Variable lease expense	108	152	191	254
Total property lease expense	$ 322	$ 320	$ 610	$ 583