Subsequent Events (Unaudited)	12 Months Ended
Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events (Unaudited)	NOTE 23. SUBSEQUENT EVENTS (UNAUDITED) Video Business On February 25, 2021, we signed an agreement to form a new company named DIRECTV (New DTV) with TPG Capital, which will be jointly governed by a board with representation from both AT&T and TPG. Under the agreement, we will contribute our Video business unit to New DTV for $4,250 of junior preferred units, an additional distribution preference of $4,200 and a 70% economic interest in common units. We expect to receive $7,600 in cash from New DTV at closing. TPG will contribute approximately $1,800 in cash to New DTV for $1,800 of senior preferred units and a 30% economic interest in common units. The remaining $5,800 will be funded by debt taken on by New DTV. As part of this transaction, we agreed to pay net losses under the NFL SUNDAY TICKET contract up to a cap of $2,500 over the remaining period of the contract. The transaction is expected to close in the second half of 2021, pending customary closing conditions. The total of $7,600 of proceeds from the transaction are expected to reduce our total and net debt positions. In the first quarter of 2021, we expect to apply held-for-sale accounting treatment to the assets and liabilities of the U.S. video business, and accordingly will include the assets in “Other current assets,” and the related liabilities in “Accounts payable and accrued liabilities,” on our consolidated balance sheet at March 31, 2021. The carrying amounts at December 31, 2020 of these assets and liabilities were approximately $16,150 and $4,900, respectively. Spectrum Auction On February 24, 2021, the FCC announced that AT&T was the winning bidder for 1,621 C-Band licenses, comprised of a total of 80 MHz nationwide, including 40 MHz in Phase I. We must provide to the FCC an initial down payment of $4,681 on March 10, 2021, of which $550 was paid as an upfront payment prior to the start of the auction, and to pay a remaining $18,725 on or before March 24, 2021. We estimate that AT&T will be responsible for $955 of Incentive Payments upon clearing of Phase I spectrum and $2,112 upon clearing of Phase II spectrum. Additionally, we will be responsible for a portion of compensable relocation costs over the next several years as the spectrum is being cleared. Satellite operators have provided the FCC with relocation cost estimates totaling $3,400. AT&T intends to fund the purchase price using a combination of cash and short-term investments, funds from operations and either short-term or long-term debt, depending upon market conditions.

Subsequent Events (Unaudited)

12 Months Ended

Dec. 31, 2020

NOTE 23. SUBSEQUENT EVENTS (UNAUDITED)

Video Business On February 25, 2021, we signed an agreement to form a new company named DIRECTV (New DTV) with TPG Capital, which will be jointly governed by a board with representation from both AT&T and TPG. Under the agreement, we will contribute our Video business unit to New DTV for $4,250 of junior preferred units, an additional distribution preference of $4,200 and a 70% economic interest in common units. We expect to receive $7,600 in cash from New DTV at closing. TPG will contribute approximately $1,800 in cash to New DTV for $1,800 of senior preferred units and a 30% economic interest in common units. The remaining $5,800 will be funded by debt taken on by New DTV. As part of this transaction, we agreed to pay net losses under the NFL SUNDAY TICKET contract up to a cap of $2,500 over the remaining period of the contract.

The transaction is expected to close in the second half of 2021, pending customary closing conditions. The total of $7,600 of proceeds from the transaction are expected to reduce our total and net debt positions.

In the first quarter of 2021, we expect to apply held-for-sale accounting treatment to the assets and liabilities of the U.S. video business, and accordingly will include the assets in “Other current assets,” and the related liabilities in “Accounts payable and accrued liabilities,” on our consolidated balance sheet at March 31, 2021. The carrying amounts at December 31, 2020 of these assets and liabilities were approximately $16,150 and $4,900, respectively.

Spectrum Auction On February 24, 2021, the FCC announced that AT&T was the winning bidder for 1,621 C-Band licenses, comprised of a total of 80 MHz nationwide, including 40 MHz in Phase I. We must provide to the FCC an initial down payment of $4,681 on March 10, 2021, of which $550 was paid as an upfront payment prior to the start of the auction, and to pay a remaining $18,725 on or before March 24, 2021. We estimate that AT&T will be responsible for $955 of Incentive Payments upon clearing of Phase I spectrum and $2,112 upon clearing of Phase II spectrum. Additionally, we will be responsible for a portion of compensable relocation costs over the next several years as the spectrum is being cleared. Satellite operators have provided the FCC with relocation cost estimates totaling $3,400. AT&T intends to fund the purchase price using a combination of cash and short-term investments, funds from operations and either short-term or long-term debt, depending upon market conditions.