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Contract Costs (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Activity Related to Capitalized Contract Cost The following table identifies the activity relating to capitalized contract costs:
in millions
 
December 31, 2018
 
Capitalized
 
Amortization
 
June 30, 2019
Capitalized contract costs
 
54

 
17

 
(8
)
 
63