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Products and Services Revenues (Tables)
 12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Schedule of operating revenues by products and services
Our operating revenues for our products and services consisted of the following revenue categorization:
 
Years Ended December 31,
 
2014
 
2013
 
2012
 
(Dollars in millions)
Strategic services
$
3,429

 
3,342

 
3,265

Legacy services
2,987

 
3,208

 
3,471

Affiliates and other services
2,422

 
2,203

 
2,112

Total operating revenues
$
8,838

 
8,753

 
8,848