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Debt (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Outstanding Borrowings
Our outstanding borrowings at March 31, 2017 and December 31, 2016 consisted of the following:
(In millions)
March 31,
2017
 
December 31,
2016
Marathon Petroleum Corporation:
 
 
 
Commercial paper
$
—

 
$
—

364-day bank revolving credit facility due July 2017
—

 
—

Trade receivables securitization facility due July 2019
—

 
—

Bank revolving credit facility due 2020
—

 
—

Term loan agreement due 2019
—

 
200

Senior notes, 2.700% due December 2018
600

 
600

Senior notes, 3.400% due December 2020
650

 
650

Senior notes, 5.125% due March 2021
1,000

 
1,000

Senior notes, 3.625%, due September 2024
750

 
750

Senior notes, 6.500%, due March 2041
1,250

 
1,250

Senior notes, 4.750%, due September 2044
800

 
800

Senior notes, 5.850% due December 2045
250

 
250

Senior notes, 5.000%, due September 2054
400

 
400

MPLX LP:
 
 
 
MPLX term loan facility due 2019
250

 
250

MPLX bank revolving credit facility due 2020
—

 
—

MPLX senior notes, 5.500%, due February 2023
710

 
710

MPLX senior notes, 4.500%, due July 2023
989

 
989

MPLX senior notes, 4.875%, due December 2024
1,149

 
1,149

MPLX senior notes, 4.000%, due February 2025
500

 
500

MPLX senior notes, 4.875%, due June 2025
1,189

 
1,189

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

 
63

MPLX senior notes, 4.125%, due March 2027
1,250

 
—

MPLX senior notes, 5.200%, due March 2047
1,000

 
—

Capital lease obligations due 2017-2028
312

 
319

Total
13,112

 
11,069

Unamortized debt issuance costs
(64
)
 
(44
)
Unamortized discount(a)
(450
)
 
(453
)
Amounts due within one year
(28
)
 
(28
)
Total long-term debt due after one year
$
12,570

 
$
10,544

(a) 
Includes $409 million and $420 million of unamortized discount as of March 31, 2017 and December 31, 2016, respectively, related to the difference between the fair value and the principal amount of assumed MarkWest debt.