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Debt (Summary of Outstanding Borrowings Interest Rates and Table Due Dates) (Details) - Senior Notes - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Feb. 15, 2023
Dec. 31, 2022
Sep. 15, 2022
Aug. 25, 2022
Aug. 11, 2022
Mar. 14, 2022
Jan. 15, 2021
Senior Note Due September 2032                
Debt Instrument [Line Items]                
Interest rate, stated percentage           4.95%    
4.000% senior notes due February 2025                
Debt Instrument [Line Items]                
Interest rate, stated percentage         3.50%      
4.875% senior notes due June 2025                
Debt Instrument [Line Items]                
Interest rate, stated percentage       3.375%        
Senior Notes Due July 2023 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage   4.50%            
Senior Notes Due January 2025 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage               5.25%
Senior Note Due March 2052 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage             4.95%  
MPLX LP | Senior Notes Due December 2024 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.875%              
Debt Instrument, Maturity Date Dec. 01, 2024              
Long-term debt, gross $ 1,149   $ 1,149          
MPLX LP | Senior Notes Due February 2025 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.00%              
Debt Instrument, Maturity Date Feb. 15, 2025              
Long-term debt, gross $ 500   500          
MPLX LP | Senior Notes Due June 2025 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.875%              
Debt Instrument, Maturity Date Jun. 01, 2025              
Long-term debt, gross $ 1,189   1,189          
MPLX LP | Senior Notes Due March 2026 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 1.75%              
Debt Instrument, Maturity Date Mar. 01, 2026              
Long-term debt, gross $ 1,500   1,500          
MPLX LP | Senior Notes Due March 2027 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.125%              
Debt Instrument, Maturity Date Mar. 01, 2027              
Long-term debt, gross $ 1,250   1,250          
MPLX LP | Senior Notes Due December 2027 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.25%              
Debt Instrument, Maturity Date Dec. 01, 2027              
Long-term debt, gross $ 732   732          
MPLX LP | Senior Notes Due March 2028 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.00%              
Debt Instrument, Maturity Date Mar. 15, 2028              
Long-term debt, gross $ 1,250   1,250          
MPLX LP | Senior Notes Due February 2029 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.80%              
Debt Instrument, Maturity Date Feb. 15, 2029              
Long-term debt, gross $ 750   750          
MPLX LP | Senior Notes Due August 2030 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 2.65%              
Debt Instrument, Maturity Date Aug. 15, 2030              
Long-term debt, gross $ 1,500   1,500          
MPLX LP | Senior Note Due September 2032                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.95%              
Debt Instrument, Maturity Date Sep. 01, 2032              
Long-term debt, gross $ 1,000   1,000          
MPLX LP | Senior Notes Due July 2023 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.50%              
Debt Instrument, Maturity Date Jul. 15, 2023              
Long-term debt, gross $ 0   989          
MPLX LP | Senior Notes Due April 2038 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.50%              
Debt Instrument, Maturity Date Apr. 15, 2038              
Long-term debt, gross $ 1,750   1,750          
MPLX LP | 5.200% senior notes due March 2047                
Debt Instrument [Line Items]                
Interest rate, stated percentage 5.20%              
Debt Instrument, Maturity Date Mar. 01, 2047              
Long-term debt, gross $ 1,000   1,000          
MPLX LP | Senior Notes Due April 2048 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.70%              
Debt Instrument, Maturity Date Apr. 15, 2048              
Long-term debt, gross $ 1,500   1,500          
MPLX LP | Senior Notes Due November 2049 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 5.50%              
Debt Instrument, Maturity Date Feb. 15, 2049              
Long-term debt, gross $ 1,500   1,500          
MPLX LP | Senior Notes Due April 2058 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.90%              
Debt Instrument, Maturity Date Apr. 15, 2058              
Long-term debt, gross $ 500   500          
MPLX LP | Senior Notes Due December 2047 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 5.20%              
Debt Instrument, Maturity Date Dec. 01, 2047              
Long-term debt, gross $ 487   487          
MPLX LP | Senior Note Due March 2052 [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.95%              
Debt Instrument, Maturity Date Mar. 14, 2052              
Long-term debt, gross $ 1,500   1,500          
MarkWest                
Debt Instrument [Line Items]                
Long-term debt, gross $ 12   23          
MarkWest | Minimum                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.50%              
Debt Instrument, Maturity Date Jul. 15, 2023              
MarkWest | Maximum                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.875%              
Debt Instrument, Maturity Date Jun. 01, 2025              
ANDX LP [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross $ 31   $ 31          
ANDX LP [Member] | Minimum                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.25%              
Debt Instrument, Maturity Date Dec. 01, 2027              
ANDX LP [Member] | Maximum                
Debt Instrument [Line Items]                
Interest rate, stated percentage 5.20%              
Debt Instrument, Maturity Date Dec. 01, 2047