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Note 17 - Other Post-retirement Benefits Which Reflects Expected Future Services Expected to Be Paid (Details) - Other Postretirement Benefit Plans [Member]
$ in Millions
Dec. 31, 2016
USD ($)
Other Postretirement Benefits Which Reflects Expected Future Services Expected To Be Paid [Line Items]  
2017 $ 5
2018 4
2019 4
2020 4
2021 4
2022 - 2026 $ 19