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Leases - Maturity of Lease Liabilities (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 5
2020	24
2021	16
2022	10
2023	6
Thereafter	3
Total future lease payments	64
Less: interest	(6)
Present value of lease liabilities	58
Finance Lease Liabilities, Payments, Due [Abstract]
2019	2
2020	6
2021	5
2022	3
2023	0
Thereafter	2
Total future lease payments	18
Less: interest	(2)
Present value of lease liabilities	$ 16

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