Leases (Narrative) (Details) - USD ($) $ in Billions	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lessor, operating lease assets	$ 0.9	$ 1.0
Lessor, accumulated depreciation	$ 0.2	$ 0.2
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	46 years
Lease, renewal term	99 years