Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Instrument

Schedule of Debt

Debt Balance, Net of Unamortized Issuance Costs (in millions)

	December 31,
	2018			2017
Revolving Credit Facility	$	945		$	423
Dropdown Credit Facility	300			—
MPC Loan Agreement	—			—
5.500% Senior Notes due 2019	500			500
3.500% Senior Notes due 2022 (a)	500			500
6.250% Senior Notes due 2022	300			300
6.375% Senior Notes due 2024	450			450
5.250% Senior Notes due 2025	750			750
4.250% Senior Notes due 2027 (a)	750			750
5.200% Senior Notes due 2047 (a)	500			500
Capital lease obligations	15			9
Total Debt	5,010			4,182
Unamortized issuance costs (a)	(46		)	(54		)
Current maturities, net of unamortized issuance costs	(504		)	(1		)
Debt, Net of Current Maturities and Unamortized Issuance Costs	$	4,460		$	4,127

(a) Unamortized discounts of $4 million and $5 million associated with these senior notes are included in unamortized issuance costs at December 31, 2018 and 2017, respectively.

Schedule of Future Minimum Annual Lease Payments for Capital Leases

Future Minimum Annual Lease Payments, Including Interest for Capital Leases (in millions)

	December 31, 2018
2019	$	4
2020	3
2021	3
2022	2
2023	2
Thereafter	4
Total minimum lease payments	18
Less amount representing interest	(3		)
Capital lease obligations	$	15