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Products and Services Revenues (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014:
 
Years Ended December 31,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Strategic services
$
2,690

 
2,610

 
2,449

Legacy services
3,222

 
3,600

 
3,967

Affiliates and other services
2,998

 
2,754

 
2,422

Total operating revenues
$
8,910

 
8,964

 
8,838