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Debt (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Summary of Outstanding Borrowings

MPLX’s outstanding borrowings consist of the following:
(In millions)
September 30, 2020
 
December 31, 2019
MPLX LP:
 
 
 
Bank revolving credit facility
$
95

 
$
—

Term loan facility
—

 
1,000

Floating rate senior notes
1,000

 
2,000

Fixed rate senior notes
19,506

 
16,887

Consolidated subsidiaries:
 
 
 
MarkWest
23

 
23

ANDX
121

 
190

Financing lease obligations(1)
12

 
19

Total
20,757

 
20,119

Unamortized debt issuance costs
(118
)
 
(106
)
Unamortized discount/premium
(290
)
 
(300
)
Amounts due within one year
(307
)
 
(9
)
Total long-term debt due after one year
$
20,042

 
$
19,704

(1)    See Note 20 for lease information.