Leasing - Schedule of Future Lease Payments for Operating and Finance Leases After Adoption (Details) $ in Millions	Mar. 31, 2020 USD ($)
Operating leases
2020	$ 21
2021	39
2022	36
2023	33
2024	30
Thereafter	157
Total future lease payments	316
Imputed interest	60
Present value of lease liabilities	256
Finance leases
2020	3
2021	6
2022	5
2023	5
2024	6
Thereafter	45
Total future lease payments	70
Imputed interest	27
Present value of lease liabilities	43
Undiscounted future lease payments for leases not yet commenced	$ 44
Term for leases that have not yet commenced	15 years