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Accounting for Leases as a Lessee - Future Minimum Lease Commitments on Finance Leases (Details)
$ in Millions
Jan. 31, 2020
USD ($)
Leases [Abstract]  
Remainder of 2020 $ 5
2021 6
2022 6
2023 7
2024 7
Thereafter 41
Total future lease payments 72
Less: imputed interest (12)
Total lease liability balance $ 60