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Products and Services Revenues (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of operating revenues by products and services
Our operating revenues for our products and services consisted of the following categories for the years ended December 31, 2017, 2016 and 2015:
 
Years Ended December 31,
 
2017
 
2016
 
2015
 
(Dollars in millions)
Strategic services
$
2,686

 
2,696

 
2,617

Legacy services
2,831

 
3,216

 
3,593

Affiliates and other services
3,033

 
2,998

 
2,754

Total operating revenues
$
8,550

 
8,910

 
8,964