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Note 2 - Acquisitions Western Refining Logistics LP Acquisition (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
[1]
Business Acquisition [Line Items]    
Goodwill $ 1,051 $ 956
WNRL Merger [Member]    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 22  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 112  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory 11  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 25  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [2] 1,295  
Goodwill 620  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 130  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable (167)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other (41)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt (347)  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest $ 1,662  
Minimum | WNRL Merger [Member]    
Business Acquisition [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Maximum | WNRL Merger [Member]    
Business Acquisition [Line Items]    
Property, Plant and Equipment, Useful Life 22 years  
[1] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.
[2] Estimated useful lives ranging from 3 to 22 years have been assumed based on the valuation.