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Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Outstanding Borrowings
Our outstanding borrowings at June 30, 2018 and December 31, 2017 consisted of the following:
(In millions)
June 30,
2018
 
December 31,
2017
Marathon Petroleum Corporation:
 
 
 
Commercial paper
$

 
$

364-day bank revolving credit facility due July 2018(a)

 

Trade receivables securitization facility due July 2019

 

Bank revolving credit facility due 2022

 

Senior notes, 2.700% due December 2018

 
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

Capital lease obligations due 2018-2033
344

 
356

MPLX LP:
 
 
 
MPLX bank revolving credit facility due 2022

 
505

MPLX senior notes, 5.500%, due February 2023
710

 
710

MPLX senior notes, 3.375%, due March 2023
500

 

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

 
1,250

MPLX senior notes, 4.000%, due March 2028
1,250

 

MPLX senior notes, 4.500%, due April 2038
1,750

 

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

 
1,000

MPLX senior notes, 4.700%, due April 2048
1,500

 

MPLX senior notes, 4.900%, due April 2058
500

 

MPLX capital lease obligations due 2020
7

 
7

Total
17,801

 
13,418

Unamortized debt issuance costs
(107
)
 
(59
)
Unamortized discount(b)
(427
)
 
(413
)
Amounts due within one year
(26
)
 
(624
)
Total long-term debt due after one year
$
17,241

 
$
12,322

(a) 
The 364-day facility expired on July 20, 2018. 
(b) 
Includes $349 million and $374 million of unamortized discount as of June 30, 2018 and December 31, 2017, respectively, related to the difference between the fair value and the principal amount of assumed MarkWest debt.