Leases (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	$ 1,211	$ 1,088
Operating Lease, Liability, Current	300	292
Operating Lease, Liability, Noncurrent	$ 931	$ 816
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Renewal Term	6 months
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Renewal Term	49 years