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Asset Impairment Expense (Tables)
3 Months Ended
Mar. 31, 2021
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
The following table presents our asset impairment expense for the periods indicated (in millions):
Three Months Ended March 31,
20212020
Puerto Rico$475 $— 
Other(2)
Total$473 $