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Contract Costs (Tables)
9 Months Ended
Sep. 30, 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 millionsDecember 31, 2019CapitalizedAmortizationSeptember 30, 2020
Capitalized contract costs$91 $23 $(25)$89 
in millionsDecember 31, 2018CapitalizedAmortizationSeptember 30, 2019
Capitalized contract costs$54 $37 $(14)$77