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Products and Services Revenues (Tables)
 9 Months Ended
Sep. 30, 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:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(Dollars in millions)
Strategic services
$
852

 
858

 
2,569

 
2,574

Legacy services
689

 
740

 
2,096

 
2,264

Affiliates and other services
746

 
600

 
2,061

 
1,777

Total operating revenues
$
2,287

 
2,198

 
6,726

 
6,615