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Debt (Outstanding Borrowings) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jul. 20, 2016
Oct. 27, 2015
Feb. 12, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 22, 2015
Debt Instrument [Line Items]            
Commercial paper       $ 0 $ 0  
Total       11,069 12,475  
Unamortized debt issuance costs       (44) (51)  
Unamortized discount [1]       (453) (499)  
Amounts due within one year       (28) (29)  
Total long-term debt due after one year       10,544 11,896  
MPLX LP            
Debt Instrument [Line Items]            
Amounts due within one year       (1) (1)  
Total long-term debt due after one year       4,422 5,255  
Senior Notes | MPLX LP | MarkWest            
Debt Instrument [Line Items]            
Long-term debt, gross       63 63  
Unamortized discount       (420) (464)  
Capital Lease Obligations [Member] | Consolidated subsidiaries:            
Debt Instrument [Line Items]            
Capital lease obligations       $ 319 348  
Debt instrument maturity year, start       Jan. 01, 2016    
Debt instrument maturity year, end       Dec. 31, 2028    
364-day bank revolving credit facility due July 2017            
Debt Instrument [Line Items]            
Line of credit facility, expiration date Jul. 19, 2017          
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]            
Line of credit facility, expiration date Jul. 19, 2019          
Trade receivables securitization facility due July 2019 | Secured Debt            
Debt Instrument [Line Items]            
Long-term debt, gross       $ 0 0  
Line of credit facility, expiration date       Jul. 19, 2019    
Bank revolving credit facility due 2020            
Debt Instrument [Line Items]            
Line of credit facility, expiration date Jul. 20, 2020          
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       $ 200 700  
Line of credit facility, expiration date       Sep. 30, 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   Nov. 20, 2019    
MPLX bank revolving credit facility due 2020 | Line of Credit | MPLX LP            
Debt Instrument [Line Items]            
Long-term debt, gross       $ 0 877  
Line of credit facility, expiration date   Dec. 04, 2020   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 $ 710
Debt instrument, maturity date       Feb. 15, 2023    
Debt instrument, interest rate       5.50%   5.50%
MPLX senior notes, 5.500%, due February 2023 | Senior Notes | MPLX LP | MarkWest            
Debt Instrument [Line Items]            
Long-term debt, gross           $ 40
Debt instrument, maturity date       Feb. 15, 2023    
Debt instrument, interest rate       5.50%   5.50%
MPLX senior notes, 4.500%, due July 2023 | Senior Notes | MPLX LP            
Debt Instrument [Line Items]            
Long-term debt, gross       $ 989 989 $ 989
Debt instrument, maturity date       Jul. 15, 2023    
Debt instrument, interest rate       4.50%   4.50%
MPLX senior notes, 4.500%, due July 2023 | Senior Notes | MPLX LP | MarkWest            
Debt Instrument [Line Items]            
Long-term debt, gross           $ 11
Debt instrument, maturity date       Jul. 15, 2023    
Debt instrument, interest rate       4.50%   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 $ 1,150
Debt instrument, maturity date       Dec. 01, 2024    
Debt instrument, interest rate       4.875%   4.875%
MPLX senior notes, 4.875%, due December 2024 | Senior Notes | MPLX LP | MarkWest            
Debt Instrument [Line Items]            
Long-term debt, gross           $ 1
Debt instrument, maturity date       Dec. 01, 2024    
Debt instrument, interest rate       4.875%   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 Feb. 15, 2025    
Debt instrument, interest rate     4.00% 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 $ 1,190
Debt instrument, maturity date       Jun. 01, 2025    
Debt instrument, interest rate       4.875%   4.875%
MPLX senior notes, 4.875%, due June 2025 | Senior Notes | MPLX LP | MarkWest            
Debt Instrument [Line Items]            
Long-term debt, gross           $ 11
Debt instrument, maturity date       Jun. 01, 2025    
Debt instrument, interest rate       4.875%   4.875%
[1] Includes $420 million and $464 million discount as of December 31, 2016 and December 31, 2015, respectively, related to the difference at the time of the acquisition between the fair value and the principal amount of the assumed MarkWest debt.