Debt - Outstanding Borrowings (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |||||
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Jun. 30, 2013
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Dec. 31, 2012
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Debt Instrument [Line Items] | ||||||
Total | $ 3,406 | $ 3,355 | ||||
Unamortized discount | (10) | (10) | ||||
Fair value adjustments | 14 | [1] | 16 | [1] | ||
Amounts due within one year | (23) | (19) | ||||
Total long-term debt due after one year | 3,387 | 3,342 | ||||
Revolving Credit Agreement Due 2017 [Member]
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Debt Instrument [Line Items] | ||||||
Borrowings outstanding at period end | 0 | 0 | ||||
Line of credit facility, expiration date | Sep. 14, 2017 | |||||
MPLX Operations LLC [Member] | Revolving Credit Agreement Due 2017 [Member]
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Debt Instrument [Line Items] | ||||||
Borrowings outstanding at period end | 0 | 0 | ||||
Line of credit facility, expiration date | Oct. 31, 2017 | |||||
Senior Notes [Member] | 3.500% Senior Notes Due March 1, 2016 [Member]
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Debt Instrument [Line Items] | ||||||
Senior notes | 750 | 750 | ||||
Debt instrument, interest rate | 3.50% | |||||
Debt instrument, maturity date | Mar. 01, 2016 | |||||
Senior Notes [Member] | 5.125% Senior Notes Due March 1, 2021 [Member]
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Debt Instrument [Line Items] | ||||||
Senior notes | 1,000 | 1,000 | ||||
Debt instrument, interest rate | 5.125% | |||||
Debt instrument, maturity date | Mar. 01, 2021 | |||||
Senior Notes [Member] | 6.500% Senior Notes Due March 1, 2041 [Member]
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Debt Instrument [Line Items] | ||||||
Senior notes | 1,250 | 1,250 | ||||
Debt instrument, interest rate | 6.50% | |||||
Debt instrument, maturity date | Mar. 01, 2041 | |||||
Capital Lease Obligations [Member] | Consolidated Subsidiaries [Member]
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Debt Instrument [Line Items] | ||||||
Capital lease obligations due 2013-2028 | 406 | 355 | ||||
Debt instrument maturity year, start | Jan. 01, 2013 | |||||
Debt instrument maturity year, end | Dec. 31, 2028 | |||||
Trade Receivables Securitization [Member] | Consolidated Subsidiaries [Member]
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Debt Instrument [Line Items] | ||||||
Trade receivables securitization facility due 2014 | $ 0 | $ 0 | ||||
Line of credit facility, expiration date | Dec. 31, 2014 | |||||
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