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Leases - Future Minimum Lease Payments (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
Operating leases, undiscounted cash flows
Operating lease, 2019	$ 81
Operating lease, 2020	126
Operating lease, 2021	88
Operating lease, 2022	69
Operating lease, 2023	53
Operating lease, Thereafter	281
Total lease payments	698
Less: Interest	(179)
Present value of lease liabilities	519	$ 554
Finance lease, undiscounted cash flows
Finance leases, 2019	27
Finance leases, 2020	45
Finance leases, 2021	37
Finance leases, 2022	27
Finance leases, 2023	19
Finance leases, Thereafter	263
Total lease payments	418
Less: Interest	(125)
Present value of lease liabilities	$ 293	$ 285

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