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Note 9 - Commitments and Contingencies (Details) - Asset Retirement Obligation Activity - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Asset Retirement Obligation Activity [Abstract]    
Asset Retirement Obligations at start of period $ 53 $ 52
Liabilities incurred in the current period 1 3
Liabilities settled in the current period (3) (1)
Accretion expense 2 2
Revision in estimated cash flows (6) (2)
Foreign exchange impact   (1)
Asset Retirement Obligations at end of period $ 47 $ 53