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Debt - Outstanding Borrowings (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Feb. 10, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Commercial paper		$ 0		$ 0
Total		13,112		11,069
Unamortized debt issuance costs		(64)		(44)
Unamortized discount	[1]	(450)		(453)
Amounts due within one year		(28)		(28)
Total long-term debt due after one year		12,570		10,544
MPLX LP
Debt Instrument [Line Items]
Amounts due within one year		(1)		(1)
Total long-term debt due after one year		6,654		4,422
Senior Notes | MPLX LP | MarkWest
Debt Instrument [Line Items]
Long-term debt, gross		63		63
Unamortized discount		(409)		(420)
Capital Lease Obligations | Subsidiaries
Debt Instrument [Line Items]
Capital lease obligations		$ 312		319
Debt instrument maturity year, start		Jan. 01, 2017
Debt instrument maturity year, end		Dec. 31, 2028
364-day bank revolving credit facility due July 2017 | Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		0
Line of credit facility, expiration date		Jul. 19, 2017
Trade receivables securitization facility due July 2019
Debt Instrument [Line Items]
Long-term debt, gross		$ 0
Trade receivables securitization facility due July 2019 | Secured Debt
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		0
Trade receivables securitization facility due July 2019 | Secured Debt | Subsidiaries
Debt Instrument [Line Items]
Line of credit facility, expiration date		Jul. 19, 2019
Bank revolving credit facility due 2020 | Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		0
Line of credit facility, expiration date		Jul. 20, 2020
Term loan agreement due 2019 | Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		200
Line of credit facility, expiration date		Sep. 24, 2019
Senior notes, 2.700% due December 2018 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 600		600
Debt instrument, maturity date		Dec. 14, 2018
Debt instrument, interest rate		2.70%
Senior notes, 3.400% due December 2020 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 650		650
Debt instrument, maturity date		Dec. 15, 2020
Debt instrument, interest rate		3.40%
Senior notes, 5.125% due March 2021 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,000		1,000
Debt instrument, maturity date		Mar. 01, 2021
Debt instrument, interest rate		5.125%
Senior notes, 3.625%, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 750		750
Debt instrument, maturity date		Sep. 15, 2024
Debt instrument, interest rate		3.625%
Senior notes, 6.500%, due March 2041 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,250		1,250
Debt instrument, maturity date		Mar. 01, 2041
Debt instrument, interest rate		6.50%
Senior notes, 4.750%, due September 2044 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 800		800
Debt instrument, maturity date		Sep. 15, 2044
Debt instrument, interest rate		4.75%
Senior notes, 5.850% due December 2045 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 250		250
Debt instrument, maturity date		Dec. 15, 2045
Debt instrument, interest rate		5.85%
Senior notes, 5.000%, due September 2054 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 400		400
Debt instrument, maturity date		Sep. 15, 2054
Debt instrument, interest rate		5.00%
MPLX term loan facility due 2019 | Unsecured Debt | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 250		250
Line of credit facility, expiration date		Nov. 20, 2019
MPLX bank revolving credit facility due 2020 | Line of Credit | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		0
Line of credit facility, expiration date		Dec. 04, 2020
MPLX senior notes, 5.500%, due February 2023 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 710		710
Debt instrument, maturity date		Feb. 15, 2023
Debt instrument, interest rate		5.50%
MPLX senior notes, 5.500%, due February 2023 | Senior Notes | MPLX LP | MarkWest
Debt Instrument [Line Items]
Debt instrument, maturity date		Feb. 15, 2023
Debt instrument, interest rate		5.50%
MPLX senior notes, 4.500%, due July 2023 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 989		989
Debt instrument, maturity date		Jul. 15, 2023
Debt instrument, interest rate		4.50%
MPLX senior notes, 4.500%, due July 2023 | Senior Notes | MPLX LP | MarkWest
Debt Instrument [Line Items]
Debt instrument, maturity date		Jul. 15, 2023
Debt instrument, interest rate		4.50%
MPLX senior notes, 4.875%, due December 2024 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,149		1,149
Debt instrument, maturity date		Dec. 01, 2024
Debt instrument, interest rate		4.875%
MPLX senior notes, 4.875%, due December 2024 | Senior Notes | MPLX LP | MarkWest
Debt Instrument [Line Items]
Debt instrument, maturity date		Dec. 01, 2024
Debt instrument, interest rate		4.875%
MPLX senior notes, 4.000%, due February 2025 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 500		500
Debt instrument, maturity date		Feb. 15, 2025
Debt instrument, interest rate		4.00%
MPLX senior notes, 4.875%, due June 2025 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,189		1,189
Debt instrument, maturity date		Jun. 01, 2025
Debt instrument, interest rate		4.875%
MPLX senior notes, 4.875%, due June 2025 | Senior Notes | MPLX LP | MarkWest
Debt Instrument [Line Items]
Debt instrument, maturity date		Jun. 01, 2025
Debt instrument, interest rate		4.875%
MPLX senior notes, 4.125%, due March 2027 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,250	$ 1,250	0
Debt instrument, maturity date		Mar. 01, 2027
Debt instrument, interest rate		4.125%	4.125%
MPLX senior notes, 5.200%, due March 2047 | Senior Notes | MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,000	$ 1,000	$ 0
Debt instrument, maturity date		Mar. 01, 2047
Debt instrument, interest rate		5.20%	5.20%
[1] Includes $409 million and $420 million of unamortized discount as of March 31, 2017 and December 31, 2016, respectively, related to the difference between the fair value and the principal amount of assumed MarkWest debt.

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