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Note 11 - Financial Instruments (Details) - Financial Instruments Not Recorded at Fair Value (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Sep. 03, 2013
Debt      
Short-term debt, carrying value $ 5us-gaap_DebtCurrent $ 4us-gaap_DebtCurrent  
Short-term debt, fair value 5us-gaap_DebtInstrumentFairValue 4us-gaap_DebtInstrumentFairValue  
Long-term debt, carrying value 672us-gaap_LongTermDebtNoncurrent 674us-gaap_LongTermDebtNoncurrent 375us-gaap_LongTermDebtNoncurrent
Long-term debt, fair value 681us-gaap_LongTermDebtFairValue 687us-gaap_LongTermDebtFairValue 676us-gaap_LongTermDebtFairValue
Fair Value, Inputs, Level 2 [Member]      
Debt      
Short-term debt, carrying value 5us-gaap_DebtCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
4us-gaap_DebtCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Short-term debt, fair value 5us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
4us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Long-term debt, carrying value 672us-gaap_LongTermDebtNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
674us-gaap_LongTermDebtNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Long-term debt, fair value $ 681us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
$ 687us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member