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Other Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Other Liabilities [Abstract]  
Other Noncurrent Liabilities
The following is a summary of the components of "Other long-term liabilities" as presented on the Company's consolidated balance sheet. See also note 2.
 December 31,
 20212020
Deferred rental revenues$1,568 $1,707 
Deferred credits, net311 375 
Asset retirement obligation 269 259 
Deferred income tax liabilities 14 11 
Other long-term liabilities6 27 
Total$2,168 $2,379 
Amortization of below-market tenant leases The following table summarizes the estimated annual amounts related to below-market tenant leases expected to be amortized into site rental revenues for the years ending December 31, 2022 to 2026 are as follows:
Years Ending December 31,
20222023202420252026
Below-market tenant leases$49 $45 $41 $33 $25