Leasing - Future Minimum Rental Payments Before Adoption (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
2020	$ 36
2021	32
2022	29
2023	27
2024	23
Thereafter	120
Total future lease payments (a)	267
Capital Leases and Financing Obligations
2020	6
2021	7
2022	7
2023	7
2024	7
Thereafter	50
Total future lease payments	84
Imputed interest	29
Present value of lease liabilities	$ 55

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