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Products and Services Revenues (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
 
(Dollars in millions)
Strategic services
$
679

 
676

 
2,011

 
2,023

Legacy services
699

 
794

 
2,160

 
2,450

Affiliates and other services
763

 
756

 
2,265

 
2,229

Total operating revenues
$
2,141

 
2,226

 
6,436

 
6,702