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Debt (Tables)
 3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Summary of Outstanding Borrowings

MPLX’s outstanding borrowings consist of the following:
(In millions)
March 31, 2020
 
December 31, 2019
MPLX LP:
 
 
 
Bank revolving credit facility
$
750

 
$
—

Term loan facility
1,000

 
1,000

Floating rate senior notes
2,000

 
2,000

Fixed rate senior notes
16,887

 
16,887

Consolidated subsidiaries:
 
 
 
MarkWest
23

 
23

ANDX
190

 
190

Financing lease obligations(1)
14

 
19

Total
20,864

 
20,119

Unamortized debt issuance costs
(103
)
 
(106
)
Unamortized discount/premium
(290
)
 
(300
)
Amounts due within one year
(4
)
 
(9
)
Total long-term debt due after one year
$
20,467

 
$
19,704

(1)    See Note 20 for lease information.