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Note 20 - Other Post-retirement Benefits Which Reflects Expected Future Services Expected to Be Paid (Details) - Other Postretirement Benefits Plan [Member]
$ in Millions
Dec. 31, 2018
USD ($)
Other Postretirement Benefits Which Reflects Expected Future Services Expected To Be Paid [Line Items]  
2019 $ 4
2020 3
2021 3
2022 3
2023 3
2024-2028 $ 17