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Senior Notes (Details) - Senior Notes [Member] - USD ($) $ in Millions	Apr. 09, 2025	Mar. 10, 2025	Feb. 18, 2025	Mar. 31, 2025
Senior Notes Due February 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Repayments of Debt			$ 500
Senior Note Due June 2035
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.40%
Percent of Par		99.398%
Debt Instrument, Face Amount		$ 1,000
Debt Instrument, Issuance Date		Mar. 10, 2025
Senior Note Due June 2055
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.95%
Percent of Par		98.331%
Debt Instrument, Face Amount		$ 1,000
Debt Instrument, Issuance Date		Mar. 10, 2025
Senior Notes Due June 2025 | Subsequent Event
Debt Instrument [Line Items]
Repayments of Debt	$ 1,200
Senior Notes Due June 2025 | MPLX LP [Member] | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Repayments of Debt	$ 1,189
Senior Notes Due June 2025 | MarkWest [Member] | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Repayments of Debt	$ 11
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				1.75%
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.95%

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