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Leases (Tables)
 12 Months Ended
Dec. 31, 2024
Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of the Company's operating lease expense are as follows:
Years Ended December 31,
202420232022
Lease cost:
Operating lease expense(a)
$706 $708 $660 
Variable lease expense(b)
209 205 175 
Total lease expense(c)
$915 $913 $835 
(a)Represents the Company's operating lease expense related to its ROU assets.
(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). 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.
Lessee, Finance Leases
The components of the Company's finance leases are as follows:
As of December 31, 2024
As of December 31, 2023
Gross Carrying ValueAccumulated AmortizationNet Book ValueGross Carrying ValueAccumulated AmortizationNet Book Value
Master Prepaid Leases
$4,234 $(3,007)$1,227 $4,243 $(2,832)$1,411 
Finance Leases
86 (48)38 71 (49)22 
Total$4,320 $(3,055)$1,265 $4,314 $(2,881)$1,433 
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, 2024:
Years Ending December 31,ThereafterTotal undiscounted lease paymentsLess: Imputed interestTotal operating lease liabilities
20252026202720282029
Operating leases(a)
$558 $551 $547 $543 $538 $5,682 $8,419 $(2,887)$5,532 
(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.