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Debt - Outstanding Borrowings (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
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]
   
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]
   
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]
   
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]
   
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]
   
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]
   
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]
   
Debt Instrument [Line Items]    
Trade receivables securitization facility due 2014 $ 0 $ 0
Line of credit facility, expiration date Dec. 31, 2014  
[1] See Note 15 for information on interest rate swaps.