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Summary of Significant Accounting Policies (Details)
bbl / d in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
refineries
Mar. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
refineries
segments
stores
bbl / d
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jun. 01, 2013
refineries
Description and Nature of Business            
Percentage ownership 36.00%   36.00%      
Number of operating segments (segments) | segments     3      
Number of refineries (refineries) | refineries           2
Percentage of TLLP's revenue derived from Tesoro 56.00% 88.00% 83.00% 87.00% 91.00%  
Short-term investments original maturities (months)     3 months      
Property, Plant and Equipment            
Capitalized interest $ 9 $ 5 $ 25 $ 19 $ 16  
Depreciation expense     363 322 281  
Finite-Lived Intangible Assets            
Amortization expense of acquired intangible assets     17 13 12  
Other Assets            
Amortization of deferred charges     182 154 125  
Amortization of deferred issuance costs     18 12 10  
Revenue Recognition            
Excise and sales taxes 140 $ 141 $ 581 567 $ 467  
Unamortized debt issuance costs $ 89          
Minimum            
Finite-Lived Intangible Assets            
Finite useful life for acquired intangibles (years)     3 years      
Other Assets            
Deferred costs useful life (years)     2 years      
Maximum            
Finite-Lived Intangible Assets            
Finite useful life for acquired intangibles (years)     35 years      
Other Assets            
Deferred costs useful life (years)     10 years      
New Accounting Pronouncement, Early Adoption, Effect            
Revenue Recognition            
Unamortized debt issuance costs     $ 93 $ 73    
Refining            
Description and Nature of Business            
Number of refineries (refineries) | refineries 6   6      
Refinery throughput capacity (barrels per day) | bbl / d     850      
Refining | Minimum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     3 years      
Refining | Maximum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     28 years      
TLLP | Minimum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     3 years      
TLLP | Maximum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     28 years      
Marketing            
Description and Nature of Business            
Number of stations (stations) | stores     2,267      
Marketing | Minimum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     3 years      
Marketing | Maximum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     16 years      
Corporate | Minimum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     3 years      
Corporate | Maximum            
Property, Plant and Equipment            
Property, plant and equipment, useful life (years)     25 years      
QEP Midstream Partners LP            
Description and Nature of Business            
Percentage ownership 58.00%   58.00%