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Contract Costs (Tables)
3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Capitalized Contract Cost The following table identifies the activity relating to capitalized contract costs:
in millions
 
January 1, 2019
 
Capitalized
 
Amortization
 
March 31, 2019
Capitalized contract costs
 
54

 
7

 
(4
)
 
57