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Note 9 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]  
Schedule of Asset Retirement Obligations [Table Text Block]

The following table provides asset retirement obligation activity (in millions):

 

 

 

For the Year Ended December 31,

 

 

 

2016

 

 

2015

 

Asset Retirement Obligations at start of period

 

$

47

 

 

$

53

 

Liabilities incurred in the current period

 

 

2

 

 

 

1

 

Liabilities settled in the current period

 

 

(7

)

 

 

(3

)

Accretion expense

 

 

2

 

 

 

2

 

Revision in estimated cash flows

 

 

(1

)

 

 

(6

)

Foreign exchange impact

 

 

 

 

 

 

Asset Retirement Obligations at end of period

 

$

43

 

 

$

47