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Valuation And Qualifying Accounts (Tables)
12 Months Ended
Dec. 31, 2017
Valuation And Qualifying Accounts  
Valuation And Qualifying Accounts [Table Text Block]
COL. ACOL. BCOL. CCOL. DCOL. E
Additions
(1)(2)(3)
Balance atCharged toCharged to
Beginning ofCosts andOtherBalance at End
PeriodExpenses (a)Accounts (b)Acquisitions (c)Deductions (d)of Period
Year 2017$6611,642--1,640$663
Year 2016$7041,474--1,517$661
Year 2015$4541,416-2141,380$704
(a) Includes amounts previously written off which were credited directly to this account when recovered.
Excludes direct charges and credits to expense for nontrade receivables in the consolidated statements
of income.
(b) Includes amounts related to long-distance carrier receivables which were billed by AT&T.
(c) Acquisitions of DIRECTV and wireless properties in Mexico in 2015.
(d) Amounts written off as uncollectible, or related to divested entities.

COL. ACOL. BCOL. CCOL. DCOL. E
Additions
(1)(2)(3)
Balance atCharged toCharged to
Beginning ofCosts andOtherAcquisitionsDeductionsBalance at End
PeriodExpenses Accounts (a)(b)(c)of Period
Year 2017$2,2832,376(19)--$4,640
Year 2016$2,1418161--$2,283
Year 2015$1,182283373420117$2,141
(a) Includes current year reclassifications from other balance sheet accounts.
(b) Acquisitions of DIRECTV and wireless properties in Mexico in 2015.
(c) Reductions to valuation allowances related to deferred tax assets.