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Products and Services Revenues (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of operating revenues by products and services
Our operating revenue for our products and services consisted of the following categories for the years ended December 31, 2018, 2017 and 2016:
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in millions)
IP and Data Services
$
616

 
634

 
667

Transport and Infrastructure
2,926

 
3,006

 
3,109

Voice and Collaboration
1,800

 
1,980

 
2,252

IT and Managed Services
6

 
—

 
2

Regulatory Services
210

 
211

 
217

Affiliate Services
2,935

 
2,719

 
2,663

Total operating revenue
$
8,493

 
8,550

 
8,910