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REVENUE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
REVENUE      
Mobile services $ 8,688 $ 8,089 $ 8,797
Fixed line services 786 796 809
Total operating revenues $ 9,474 8,885 $ 9,606
Decrease in service revenue and service costs for comparison purposes   $ 19