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Contract Costs (Tables)
12 Months Ended
Dec. 31, 2020
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 millionsDecember 31, 2019CapitalizedAmortizationDecember 31, 2020
Capitalized contract costs$91 $40 $(33)$98 
In millionsDecember 31, 2018CapitalizedAmortizationDecember 31, 2019
Capitalized contract costs$54 $57 $(20)$91