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Note 9 - Summary of Undiscounted Cash Flows for Next Five Years and Thereafter to Finance Lease Liabilities and Operating Lease Liabilities Recorded on Balance Sheet (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating Leases, Q2 - Q4 2019	$ 19
Operating Leases, 2020	25
Operating Leases, 2021	9
Operating Leases, 2022	6
Operating Leases, 2023	6
Operating Leases, Thereafter	24
Operating Leases, Total minimum lease payments	89
Operating Leases, Less: amount of lease payments representing interest	(31)
Operating Leases, Present value of future minimum lease payments	58
Operating Leases, Less: current obligations under leases	(23)
Operatibg Leases, Long-term lease obligations	35
Finance Leases, Q2 - Q4 2019	1
Finance Leases, 2020	1
Finance Leases, 2021	1
Finance Leases, Thereafter	116
Finance Leases, Total minimum lease payments	119
Finance Leases, Less: amount of lease payments representing interest	(115)
Finance Leases, Present value of future minimum lease payments	4
Finance Leases, Less: current obligations under leases	(2)
Finance Leases, Long-term lease obligations	$ 2

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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