Leases Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2019 USD ($)	[1]
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 534
Lessee, Operating Lease, Liability, Payments, Due Year Two	528
Lessee, Operating Lease, Liability, Payments, Due Year Three	524
Lessee, Operating Lease, Liability, Payments, Due Year Four	520
Lessee, Operating Lease, Liability, Payments, Due Year Five	517
Lessee, Operating Lease, Liability, Payments, Due after Year Five	6,357
Lessee, Operating Lease, Liability, Payments, Due	8,980
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(3,170)
Operating Lease, Liability	$ 5,810

[1] Excludes the Company's contingent payments for operating leases (such as payments based on revenues derived from the communications infrastructure located on the leased asset) as such arrangements are excluded from the Company's operating lease liability. Such contingencies are recognized as expense in the period they are resolved.