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Contract Costs (Tables)
 9 Months Ended
Sep. 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
 
September 30, 2019
Capitalized contract costs
 
$
54

 
$
37

 
$
(14
)
 
$
77