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Note 10 - Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Annual Payments
Future Minimum Annual Payments Applicable to all Non-Cancellable Operating Leases and Purchase Obligations (in millions)
 
Payments Due by Period
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
 
Total
Purchase obligations
$
2,078

 
$
2,084

 
$
2,054

 
$
2,013

 
$
2,013

 
$
1,673

 
$
11,915

Operating leases
17

 
17

 
15

 
13

 
13

 
105

 
180

Total
$
2,095

 
$
2,101

 
$
2,069

 
$
2,026

 
$
2,026

 
$
1,778

 
$
12,095
Changes in Environmental Liabilities
Changes in our Environmental Liabilities (in millions)
 
Tioga Crude Oil Pipeline Release
 
Other Liabilities
 
Total
At December 31, 2016
$
16

 
$
6

 
$
22

Additions
19

 
1

 
20

Expenditures
(25
)
 
(1
)
 
(26
)
At December 31, 2017
10

 
6

 
16

Additions
1

 
5

 
6

Expenditures
(11
)
 
(5
)
 
(16
)
At December 31, 2018
$
—

 
$
6

 
$
6