v3.19.2
Debt (Notes)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Debt Debt

Debt Balance, Net of Unamortized Issuance Costs (in millions)
 
June 30,
2019
 
December 31,
2018
Total debt
$
5,263

 
$
5,010

Unamortized issuance costs
(40
)
 
(46
)
Current maturities
(503
)
 
(504
)
Debt, Net of Current Maturities and Unamortized Issuance Costs
$
4,720

 
$
4,460



Our debt is non-recourse to Marathon, except for TLGP and, with respect to borrowings under our Dropdown Credit Facility, WR Southwest.

Available Capacity Under Credit Facilities (in millions) (a)
 
Total Capacity
 
Amount Borrowed as of June 30, 2019
 
Outstanding
Letters of Credit
 
Available Capacity as of June 30, 2019
 
Weighted Average Interest Rate
 
Expiration
Revolving Credit Facility
$
1,100

 
$
1,070

 
$
—

 
$
30

 
3.90
%
 
January 29, 2021
Dropdown Credit Facility
1,000

 
430

 
—

 
570

 
3.92
%
 
January 29, 2021
MPC Loan Agreement
500

 
—

 
—

 
500

 
—
%
 
December 21, 2023
Total Credit Facilities
$
2,600

 
$
1,500

 
$
—

 
$
1,100

 
 
 
 


(a)
In conjunction with the MPLX Merger, on July 30, 2019, all outstanding borrowings and unpaid fees on our credit facilities were repaid and the agreements were terminated, including the MPC Loan Agreement.