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Contract Costs (Tables)
9 Months Ended
Sep. 30, 2021
Capitalized Contract Cost [Abstract]  
Schedule of Activity Related to Capitalized Contract Cost The following table identifies the activity relating to capitalized contract costs:
in millionsDecember 31, 2020CapitalizedAmortizationSeptember 30, 2021
Capitalized contract costs$98 $35 $(34)$99 
in millionsDecember 31, 2019CapitalizedAmortizationSeptember 30, 2020
Capitalized contract costs$91 $23 $(25)$89