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Products and Services Revenue (Tables)
 6 Months Ended
Jun. 30, 2019
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,
 
2019
 
2018
 
2019
 
2018
 
(Dollars in millions)
IP and Data Services
$
965

 
988

 
1,945

 
1,991

Transport and Infrastructure
655

 
673

 
1,313

 
1,349

Voice and Collaboration
355

 
363

 
706

 
745

Other
1

 
1

 
3

 
2

Affiliate Services
38

 
27

 
93

 
52

Total operating revenue
$
2,014

 
2,052

 
4,060

 
4,139