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Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Summary of Outstanding Borrowings

The Partnership’s outstanding borrowings consisted of the following:
(In millions)
June 30, 2017
 
December 31, 2016
MPLX LP:
 
 
 
Bank revolving credit facility due 2020
$
—

 
$
—

Term loan facility due 2019
250

 
250

5.500% senior notes due February 2023
710

 
710

4.500% senior notes due July 2023
989

 
989

4.875% senior notes due December 2024
1,149

 
1,149

4.000% senior notes due February 2025
500

 
500

4.875% senior notes due June 2025
1,189

 
1,189

4.125% senior notes due March 2027
1,250

 
—

5.200% senior notes due March 2047
1,000

 
—

Consolidated subsidiaries:
 
 
 
MarkWest - 4.500% - 5.500% senior notes, due 2023-2025
63

 
63

MPL - capital lease obligations due 2020
8

 
8

Total
7,108

 
4,858

Unamortized debt issuance costs
(28
)
 
(7
)
Unamortized discount
(413
)
 
(428
)
Amounts due within one year
(1
)
 
(1
)
Total long-term debt due after one year
$
6,666

 
$
4,422