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Contract Costs (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Activity Related to Capitalized Contract Costs These costs are periodically reviewed for impairment. The following table identifies the activity relating to capitalized contract costs:
In millions
 
December 31, 2018
 
Capitalized
 
Amortization
 
December 31, 2019
Capitalized contract costs
 
$
54

 
$
57

 
$
(20
)
 
$
91

In millions
 
January 1, 2018
 
Capitalized
 
Amortization
 
December 31, 2018
Capitalized contract costs
 
$
17

 
$
44

 
$
(7
)
 
$
54