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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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