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Other Liabilities (Notes)
 12 Months Ended
Dec. 31, 2020
Other Liabilities [Abstract]  
Other Liabilities
Other long-term 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,
 20202019
Deferred rental revenues$1,707 $1,814 
Deferred credits, net375 434 
Asset retirement obligation 259 227 
Deferred income tax liabilities 11 8 
Other long-term liabilities27 33 
Total$2,379 $2,516 
Pursuant to its ground lease, easement and leased facility agreements, the Company has the obligation to perform certain asset retirement activities, including requirements upon contract termination to remove communications infrastructure or remediate the space on which its communications infrastructure is located. Accretion expense related to liabilities for retirement obligations amounted to $18 million, $15 million and $14 million for the years ended December 31, 2020, 2019 and 2018, respectively. As of December 31, 2020, the estimated undiscounted future cash outlay for asset retirement obligations was approximately $1.0 billion. See note 2.
For the year ended December 31, 2018, the Company recorded $18 million as a decrease to "Site rental costs of operations" for the amortization of above-market leases for land under the Company's towers. Effective January 1, 2019, the Company adopted ASC 842 and these above-market leases were de-recognized and reclassified from "Other long-term liabilities" into the "Operating lease right-of-use assets" on the Company's consolidated balance sheet.
For the years ended December 31, 2020, 2019 and 2018, the Company recognized $58 million, $65 million and $69 million, respectively, in "Site rental revenues" related to the 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, 2021 to 2025 are as follows:
Years Ending December 31,
20212022202320242025
Below-market tenant leases$53 $48 $45 $41 $33 
Other accrued liabilities
Other accrued liabilities included accrued payroll and other accrued compensation of $192 million and $174 million, respectively, as of December 31, 2020 and 2019.