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Products and Services Revenue (Tables)
6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue
Our operating revenue for our products and services consisted of the following categories:
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
 (Dollars in millions)
IP and Data Services$131  145  267  285  
Transport and Infrastructure651  696  1,308  1,397  
Voice and Collaboration380  419  775  837  
IT and Managed Services—     
Regulatory Revenue45  47  91  95  
Affiliate Services592  720  1,275  1,442  
Total operating revenue$1,799  2,028  3,717  4,058