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Leases - Maturity of Lease Liabilities (Detail) $ in Millions	Mar. 31, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 19
2020	20
2021	12
2022	8
2023	6
Thereafter	4
Total future lease payments	69
Less: interest	(7)
Present value of lease liabilities	62
Finance Lease Liabilities, Payments, Due [Abstract]
2019	2
2020	3
2021	2
2022	1
Thereafter	2
Total future lease payments	10
Less: interest	(2)
Present value of lease liabilities	$ 8

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