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Debt, Total (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
Capital lease obligations $ 15 $ 9
Total Debt 5,010 4,182
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (46) (54)
Long-term Debt and Capital Lease Obligations, Current (504) (1)
Debt, Net of Current Maturities and Unamortized Issuance Costs 4,460 4,127 [1]
Debt Instrument, Unamortized Discount 4 5
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months 504  
Long-term Debt, Maturities, Repayments of Principal in Year Two 2  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,200  
Long-term Debt, Maturities, Repayments of Principal in Year Four 802  
Long-term Debt, Maturities, Repayments of Principal in Year Five 1  
Loans Payable [Member] | MPC Loan Agreement [Member]    
Debt Instrument    
Revolving Credit Facility 0 0
Senior Notes [Member] | 5.200% Senior Notes due 2047 [Member]    
Debt Instrument    
Senior Notes 500 500
Senior Notes [Member] | 4.250% Senior Notes due 2027 [Member]    
Debt Instrument    
Senior Notes 750 750
Senior Notes [Member] | 5.250% Senior Notes due 2025    
Debt Instrument    
Senior Notes 750 750
Senior Notes [Member] | 6.375% Senior Notes due 2024    
Debt Instrument    
Senior Notes 450 450
Senior Notes [Member] | 6.250% Senior Notes Due 2022    
Debt Instrument    
Senior Notes 300 300
Senior Notes [Member] | 5.50% Senior Notes Due 2019 [Member]    
Debt Instrument    
Senior Notes 500 500
Senior Notes [Member] | 3.500% Senior Notes due 2022 [Member]    
Debt Instrument    
Senior Notes 500 500
Revolving Credit Facility | Revolving Credit Facility    
Debt Instrument    
Revolving Credit Facility 945 423
Revolving Credit Facility | Dropdown Credit Facility    
Debt Instrument    
Revolving Credit Facility $ 300 $ 0
[1] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.