Leases (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	$ 1,023	$ 1,102
Operating Lease, Liability, Current	277	261
Operating Lease, Liability, Noncurrent	$ 765	$ 863
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Renewal Term	1 month
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Renewal Term	49 years