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Note 8 - Short-term Borrowings and Long-term Debt (Details) - Annual Maturities of Long-term Debt
$ in Millions
Dec. 31, 2015
USD ($)
Annual Maturities of Long-term Debt [Abstract]  
2016 $ 5
2016 5
2017 4
2017 4
2018 5
2018 5
2019 392
2019 397
2020 271
2020 276
2021 and thereafter 3
2021 and thereafter 3
Total 680
Total $ 690