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Contract Costs (Tables)
 3 Months Ended
Mar. 31, 2020
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, 2019
 
Capitalized
 
Amortization
 
March 31, 2020
Capitalized contract costs
 
$
91

 
$
6

 
$
(10
)
 
$
87

in millions
 
December 31, 2018
 
Capitalized
 
Amortization
 
March 31, 2019
Capitalized contract costs
 
$
54

 
$
7

 
$
(4
)
 
$
57