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Related-Party Transactions, Agreements (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction        
Operating Leases, Income Statement, Lease Revenue   $ 425 $ 277 $ 193
Other Commitments        
2018, Commitment   530    
2022, Commitment   478    
Operating Leases, Future Minimum Payments Receivable, Thereafter   1,500    
Indemnification deductible   $ 1    
Second Amended and Restated Trucking Transportation Services Agreement (High Plains System)        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-11    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Second Amended and Restated Master Terminalling Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-11    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Salt Lake City Storage Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-11    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Transportation Services Agreement (LAR Short Haul Pipeline) [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Sep-12    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Amended Anacortes Track Use and Throughput Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   0    
Service Agreement Initiation Date   Nov-12    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   1 year    
Amorco Terminal Use and Throughput Agreement (Martinez Marine)        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-12    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Long Beach Storage Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Dec-12    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Terminalling Services Agreement for Northwest Product System [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jun-13    
Term (years)   1 year    
Other Commitments        
Term Of Renewal   5 years    
Terminalling, Transportation, and Storage Services Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-16    
Term (years)   6 months    
Other Commitments        
Term Of Renewal   5 years    
Long Beach Pipeline Throughput Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Dec-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Transportation Services Agreement (SoCal Pipelines) [Member]        
Related Party Transaction        
Number Of Contract Renewals   0    
Service Agreement Initiation Date   Dec-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   0 years    
Bakken Area Storage Hub Storage - TRMC Tanks [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-14    
Term (years)   5 years    
Other Commitments        
Term Of Renewal   5 years    
Transportation Services Agreement (LAR Short Haul Pipeline) [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jul-14    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Terminalling & Dedicated Storage Services Agreement - Anacortes [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jul-14    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
THPP Reversal Open Season Northbound Commitment [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Sep-14    
Term (years)   7 years    
Tesoro Alaska Pipeline Throughput Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Sep-14    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Keep-Whole Commodity Fee Agreement        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Dec-14    
Term (years)   5 years    
Other Commitments        
Term Of Renewal   5 years    
Crude OIl Trucking Transportation Services Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Oct-14    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Fuel Distribution and Supply Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Oct-14    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Product Supply Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Oct-14    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Kenai Storage Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jul-16    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Terminalling, Transportation and Storage Services Agreement - St. Paul Park [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Sep-16    
Term (years)   10 years    
Other Commitments        
Length Of Time For Continuing Minimum Payments   12 months    
Alaska Terminalling Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Sep-16    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Martinez Storage Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Nov-16    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Crude OIl Trucking Transportation Services Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   0    
Service Agreement Initiation Date   Oct-15    
Term (years)   1 month    
Other Commitments        
Term Of Renewal   0 years    
Fuel Distribution and Supply Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   0    
Service Agreement Initiation Date   Jan-16    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   0 years    
Product Supply Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   0    
Service Agreement Initiation Date   Feb-16    
Term (years)   1 year    
Other Commitments        
Term Of Renewal   0 years    
Carson Tank Farm Storage Agreement        
Related Party Transaction        
Number Of Contract Renewals [1]   2    
Service Agreement Initiation Date [1]   Jun-13    
Term (years) [1]   10 years    
Other Commitments        
Term Of Renewal [1]   5 years    
Term Of Modification [1]   20 years    
Terminalling, Transportation, and Storage Services Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Oct-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Amended Pipeline and Gathering Services Agreement - WNRL [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Oct-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Asphalt and Propane Rack Loading Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   May-16    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Southern California Terminalling Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jun-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Carson Storage Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jun-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Avon Marine Terminal Use and Throughput Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   0    
Service Agreement Initiation Date   Jan-17    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   0 years    
Belfield Crude & Oil Gathering [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Jan-17    
Term (years)   2 years    
Other Commitments        
Term Of Renewal   5 years    
Amended Renewal Trucking Transportation Services Agreement [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Apr-17    
Term (years)   1 year    
Product Transportation Agreement (TRMC, WRSW, WRCLP, SPPRC) [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Jan-18    
Term (years)   1 year    
Plant Dedication Agreement (Robinson Lake and Belfield) [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Apr-18    
Term (years)   3 years    
Product Sales Agreement - Robinson Lake [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Apr-18    
Term (years)   3 years    
Product Sales Agreement - Belfield [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Apr-18    
Term (years)   3 years    
Product Sales Agreement Y-Grade - Robinson Lake [Member]        
Related Party Transaction        
Service Agreement Initiation Date   May-18    
Term (years)   1 month    
SLC Core Crude Throughput [Member]        
Related Party Transaction        
Service Agreement Initiation Date   May-18    
Term (years)   2 months 12 days    
Truck Loading (H2S) Little Knife [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Jun-18    
Term (years)   6 years    
Truck Unloading Facility Throughput Agreement (Stanley LACT) [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Jun-18    
Term (years)   3 years    
Transportation Services Agreement (LAR Interconnecting Pipelines) [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Aug-18    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Amended Master Terminalling Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Aug-18    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Master Unloading and Storage Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Aug-18    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Amended Asphalt Terminalling, Transportation and Storage Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Aug-18    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   30 days    
Fryburg Terminal Services Agreement [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Aug-18    
Term (years)   2 years 7 months    
Transloading Services Agreement - Salt Lake City Spur [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Oct-18    
Term (years)   3 years    
Natural Gas Liquids Marketing Agreement [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Oct-18    
Term (years)   3 years    
Amended Salt Lake City Storage and Transportation Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Apr-11    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Length Of Time For Continuing Minimum Payments   12 months    
Carson Coke Handling Services Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Dec-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Amended and Restated Long Beach Berth Access Use and Throughput Agreement [Member]        
Related Party Transaction        
Number Of Contract Renewals   2    
Service Agreement Initiation Date   Dec-13    
Term (years)   10 years    
Other Commitments        
Term Of Renewal   5 years    
Transportation Services Agreement (Anacortes Short Haul Pipelines) [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Nov-17    
Term (years)   10 years    
Anacortes Manifest Rail Terminalling Services Agreement [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Nov-17    
Term (years)   10 years    
Anacortes Marine Terminal Operating Agreement [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Nov-17    
Term (years)   17 years    
Storage Services Agreement-Anacortes II [Member]        
Related Party Transaction        
Service Agreement Initiation Date   Nov-17    
Term (years)   10 years    
Partner to Andeavor [Member] | Omnibus Agreement        
Other Commitments        
Payment for Administrative Fees   $ 17    
Partner to Andeavor [Member] | Secondment and Logistics Services Agreement        
Other Commitments        
Long-term Purchase Commitment, Amount   8 $ 8 $ 5
Affiliated Entity [Member]        
Related Party Transaction        
Operating Leases, Income Statement, Lease Revenue   $ 407    
Subsequent Event | Secondment and Logistics Services Agreement        
Related Party Transaction        
Term (years) 10 years      
Other Commitments        
Length Of Time For Continuing Minimum Payments 60 days      
[1] Agreement gives Marathon the option to renew for two five-year terms, or Marathon may modify the term of the agreements to a twenty-year term by providing notice in accordance with each agreement.