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Contract Costs (Tables)
6 Months Ended
Jun. 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, 2019CapitalizedAmortizationJune 30, 2020
Capitalized contract costs$91  $14  $(17) $88  
in millionsDecember 31, 2018CapitalizedAmortizationJune 30, 2019
Capitalized contract costs$54  $17  $(8) $63