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Contract Costs (Tables)
6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Capitalized Contract Cost
The following table identifies the activity relating to capitalized contract costs:
(in millions)
 
January 1, 2018
 
Capitalized
 
Amortization
 
June 30, 2018
Capitalized contract costs
 
17

 
10

 
(3
)
 
24