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|Dec 31, 2020||Dec 31, 2019||Dec 31, 2018||Dec 31, 2017||Dec 31, 2016|
|Wireless devices and accessories|
|Equipment inventories||Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.||AT&T Inc.’s equipment inventories increased from 2018 to 2019 and from 2019 to 2020.|