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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information (Unaudited)  
Quarterly Financial Results
  2015 Calendar Quarter   
  First1 Second1 Third Fourth2 Annual
Total Operating Revenues$32,576 $33,015 $39,091 $42,119 $146,801
Operating Income 5,557  5,773  5,923  7,532  24,785
Net Income 3,339  3,184  3,078  4,086  13,687
Net Income Attributable to AT&T 3,263  3,082  2,994  4,006  13,345
Basic Earnings Per Share               
Attributable to AT&T3$0.63 $0.59 $0.50 $0.65 $2.37
Diluted Earnings Per Share               
Attributable to AT&T3$0.63 $0.59 $0.50 $0.65 $2.37
Stock Price              
High$35.07 $36.45 $35.93 $34.99   
Low 32.41  32.37  30.97  32.17   
Close 32.65  35.52  32.58  34.41   
 1Amounts have been adjusted for the voluntary change in accounting policy (Note 1).
 2Includes an actuarial gain on pension and postretirement benefit plans (Note 12).
 3Quarterly earnings per share impacts may not add to full-year earnings per share impacts due to the difference in weighted-average
 common shares for the quarters versus the weighted-average common shares for the year.

  2014 Calendar Quarter   
  First1 Second1 Third1 Fourth1, 2 Annual
Total Operating Revenues$32,476 $32,575 $32,957 $34,439 $132,447
Operating Income (Loss) 6,335  5,739  5,607  (5,469)  12,212
Net Income (Loss) 3,770  3,697  3,187  (3,918)  6,736
Net Income (Loss) Attributable to AT&T 3,688  3,623  3,130  (3,999)  6,442
Basic Earnings (Loss) Per Share               
Attributable to AT&T3$0.71 $0.70 $0.60 $(0.77) $1.24
Diluted Earnings (Loss) Per Share               
Attributable to AT&T3$0.70 $0.69 $0.60 $(0.77) $1.24
Stock Price              
High$35.50 $36.86 $37.48 $36.16   
Low 31.74  34.32  34.17  32.07   
Close 35.07  35.36  35.24  33.59   
 1Amounts have been adjusted for the voluntary change in accounting policy (Note 1).
 2Includes an actuarial loss on pension and postretirement benefit plans (Note 12) and asset abandonment charges (Note 6).
 3Quarterly earnings per share impacts may not add to full-year earnings per share impacts due to the difference in weighted-average
 common shares for the quarters versus the weighted-average common shares for the year.