v3.3.1.900
Summary of Significant Accounting Policies, Narrative (Details)
$ in Millions
 12 Months Ended
Jul. 22, 2015
Dec. 02, 2014
facility
Jun. 19, 2013
Dec. 31, 2015
USD ($)
terminals
systems
system
facility
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Nov. 12, 2015
terminals
Property, Plant and Equipment              
Number of assets | terminals       29      
Unamortized debt issuance costs [1]       $ (39) $ (44)    
Deferred income tax expense       1      
Capitalized interest costs       9 6 $ 2  
Goodwill       130 164 [2]    
Pollution liability insurance deductible       1      
Pollution liabilities insurance coverage loss limit       150      
Debt, fair Value       2,800 2,600    
Debt, carrying value       $ 2,900 2,600    
Finite-Lived intangible asset, useful life (years)       35 years      
Amortization expense       $ 29      
Amortization expense, 2016       29      
Amortization expense, 2017       29      
Amortization expense, 2018       29      
Amortization expense, 2019       29      
Amortization expense, 2020       29      
Asset retirement obligations         30    
Reimbursements from Tesoro       34 26 4  
Capital contributions by affiliate [3]       22 26 5  
Unit-based compensation expense [3]       $ 6 2 $ 2  
Units available for future grants (units) | shares       212,310      
Minimum              
Property, Plant and Equipment              
Financial instruments, outstanding term       90 days      
Property, plant and equipment, estimated useful life (years)       3 years      
Maximum              
Property, Plant and Equipment              
Cash equivalents maturity period (months)       3 months      
Percent of trade payables outstanding       4.00%      
Percent of trade receivables outstanding       1.00%      
Property, plant and equipment, estimated useful life (years)       28 years      
High plains System              
Property, Plant and Equipment              
Number of assets | system       1      
Williston Gathering System              
Property, Plant and Equipment              
Number of assets | system       1      
Uinta Basin Gathering System              
Property, Plant and Equipment              
Number of assets | systems       1      
Green River System              
Property, Plant and Equipment              
Number of assets | system       1      
Rockies Natural Gas Business Acquisition              
Property, Plant and Equipment              
Goodwill       $ 121      
Effective date of acquisition Jul. 22, 2015 Dec. 02, 2014          
Northwest Products System              
Property, Plant and Equipment              
Goodwill         9    
Effective date of acquisition     Jun. 19, 2013        
UBFS              
Property, Plant and Equipment              
Ownership interest       38.00%      
Regulated common carrier refined products pipeline system              
Property, Plant and Equipment              
Pollution liability insurance deductible       $ 5      
TRG              
Property, Plant and Equipment              
Equity method investment       1      
Ownership interest       50.00%      
Vermillion Gathering System              
Property, Plant and Equipment              
Number of assets | system       1      
Uinta Basin Field Services [Member]              
Property, Plant and Equipment              
Equity method investment       1      
Gathering | Rockies Natural Gas Business Acquisition              
Property, Plant and Equipment              
Goodwill       $ 22      
Processing | Rockies Natural Gas Business Acquisition              
Property, Plant and Equipment              
Goodwill       $ 99      
Refined products              
Property, Plant and Equipment              
Percent retained for volume losses       0.25%      
Refined products | Northwest Products System              
Property, Plant and Equipment              
Percent retained for volume losses       0.25%      
Distillates | Northwest Products System              
Property, Plant and Equipment              
Percent retained for volume losses       0.125%      
Crude oil              
Property, Plant and Equipment              
Percent retained for volume losses       0.20%      
Crude Oil And Refined Products Terminals And Storage Facilities              
Property, Plant and Equipment              
Number of assets | terminals       25     1
Gas Processing Complexes | Processing              
Property, Plant and Equipment              
Number of assets | facility       4      
Fractionation Facility              
Property, Plant and Equipment              
Number of assets | facility   1          
Fractionation Facility | Processing              
Property, Plant and Equipment              
Number of assets | facility       1      
New accounting standard, early adoption              
Property, Plant and Equipment              
Unamortized debt issuance costs       $ 43 $ 49    
[1] The Company adopted ASU 2015-03 in the first quarter of 2015 and applied changes retrospectively to the prior period presented. See Note 1 for further discussion.
[2] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.
[3] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.