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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021:
Years Ending December 31,
20222023202420252026ThereafterTotal undiscounted lease paymentsLess: Imputed interestTotal operating lease liabilities
Operating leases(a)
$556 $553 $545 $530 $520 $5,749 $8,453 $(2,073)$6,380 
(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,
202120202019
Lease cost:
Operating lease expense(a)
$646 $640 $632 
Variable lease expense(b)
164 153 149 
Total lease expense(c)
$810 $793 $781 
(a)Represents the Company's operating lease expense related to its ROU assets for the twelve months ended December 31, 2021, 2020 and 2019.
(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 twelve months ended December 31, 2021, 2020 and 2019. 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.