Leases (Lessee Components of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Property leases
Operating lease expense	$ 212	$ 184	$ 631	$ 513
Variable lease expense	136	169	327	423
Total property lease expense	$ 348	$ 353	$ 958	$ 936