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Note 10 - Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule
FUTURE MINIMUM ANNUAL PAYMENTS APPLICABLE TO ALL NON-CANCELLABLE OPERATING LEASES AND PURCHASE OBLIGATIONS (in millions)
 
Payments Due by Period
 
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Operating leases
$
16

 
$
12

 
$
11

 
$
9

 
$
8

 
$
70

 
$
126

Purchase obligations
86

 
86

 
86

 
87

 
49

 
—

 
394

Total
$
102

 
$
98

 
$
97

 
$
96

 
$
57

 
$
70

 
$
520
Environmental Exit Costs by Cost
CHANGES IN OUR ENVIRONMENTAL LIABILITIES (in millions)
 
Tioga Crude Oil Pipeline Release
 
Other Liabilities
 
Total
At December 31, 2014
$
25

 
$
7

 
$
32

Additions
24

 
1

 
25

Expenditures
(22
)
 
(2
)
 
(24
)
At December 31, 2015
27

 
6

 
33

Additions
7

 
1

 
8

Expenditures
(18
)
 
(1
)
 
(19
)
At December 31, 2016
$
16

 
$
6

 
$
22