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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 ($)
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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

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