Leases (Tables)

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following table is a summary of the Company's maturities of operating lease liabilities as of December 31, 2022:

	Years Ending December 31,										Thereafter		Total undiscounted lease payments		Less: Imputed interest		Total operating lease liabilities
	2023		2024		2025		2026		2027
Operating leases(a)	$	568	$	561	$	545	$	538	$	531	$	5,660	$	8,403	$	(2,172)	$	6,231

(a)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.

Lease, Cost [Table Text Block]

The components of the Company's operating lease expense are as follows:

	Years Ended December 31,
	2022		2021		2020
Lease cost:
Operating lease expense(a)	$	660	$	646	$	640
Variable lease expense(b)	175		164		153
Total lease expense(c)	$	835	$	810	$	793

(a)Represents the Company's operating lease expense related to its ROU assets for the years ended December 31, 2022, 2021 and 2020.

(b)Represents the Company's expense related to contingent payments for operating leases (such as payments based on revenues derived from the communications infrastructure located on the leased asset) for the years ended December 31, 2022, 2021 and 2020. Such contingencies are recognized as expense in the period they are resolved.

(c)Excludes those direct operating expenses accounted for pursuant to accounting guidance outside the scope of ASC 842.