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Supplemental Cash Flow Information (Summary of Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 68 $ 5    
Net cash provided by operating activities included:        
Interest paid (net of amounts capitalized) 484 263 $ 213  
Income taxes paid 1 3 4  
Non-cash investing and financing activities:        
Net transfers of property, plant and equipment from materials and supplies inventories 2 6 (3)  
Contribution - fixed assets to joint venture [1] 0 337 0  
Contribution - common units issued [2] 4,236 1,133 669  
Acquisitions [Abstract]        
Restricted Cash [3] 8 4    
Cash, cash equivalents and restricted cash at end of period $ 76 [4] $ 9 [4] $ 239 $ 52
[1] Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 5.
[2] For 2016, includes limited partner units issued to MPC as consideration in the acquisition of HSM. For 2017, includes limited and general partner units issued to MPC as consideration in the acquisitions of the joint-interests, HST, WHC and MPLXT. For 2018, includes limited and general partner units issued to MPC as consideration in the acquisition of Refining Logistics and Fuels Distribution. See Note 4.
[3] The restricted cash balance is included within “Other current assets” on the Consolidated Balance Sheets.
[4] As a result of the adoption of ASU 2016-18, Statement of Cash Flows - Restricted Cash, the Consolidated Statements of Cash Flows now explain the change during the period of both “Cash and cash equivalents” and “Restricted cash.”