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Products and Services Revenues (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(Dollars in millions)
Strategic services
$
668

 
676

 
1,332

 
1,348

Legacy services
718

 
812

 
1,461

 
1,655

Affiliates and other services
747

 
735

 
1,502

 
1,473

Total operating revenues
$
2,133

 
2,223

 
4,295

 
4,476