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Products and Services Revenues (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013:
 
Years Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
Strategic services
$
3,433

 
3,429

 
3,342

Legacy services
2,777

 
2,987

 
3,208

Affiliates and other services
2,754

 
2,422

 
2,203

Total operating revenues
$
8,964

 
8,838

 
8,753