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Products and Services Revenues (Tables)
 9 Months Ended
Sep. 30, 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:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Strategic services
$
674

 
651

 
2,018

 
1,942

Legacy services
796

 
890

 
2,455

 
2,723

Affiliates and other services
756

 
746

 
2,229

 
2,061

Total operating revenues
$
2,226

 
2,287

 
6,702

 
6,726