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Leases - Maturity of Lease Liabilities (Detail) $ in Millions	Jun. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 13
2020	23
2021	15
2022	9
2023	6
Thereafter	3
Total future lease payments	69
Less: interest	(6)
Present value of lease liabilities	63
Finance Lease Liabilities, Payments, Due [Abstract]
2019	2
2020	5
2021	4
2022	1
2023	0
Thereafter	2
Total future lease payments	14
Less: interest	(2)
Present value of lease liabilities	$ 12

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