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Tower Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Summary of Impacts to Consolidated Balance Sheets
The following table summarizes the balances of the failed sale-leasebacks in the Consolidated Balance Sheets:
(in millions)December 31, 2019December 31, 2018
Property and equipment, net$198  $329  
Tower obligations2,236  2,557