Long-term debt consists of the following:

	December 31,		September 30,
	2017		2017
	(in millions)
Revolving Credit Facility—Acquisition Corp. (a)	$	—	$	—
Senior Term Loan Facility due 2023—Acquisition Corp. (b)		991		990
5.625% Senior Secured Notes due 2022—Acquisition Corp. (c)		246		246
5.00% Senior Secured Notes due 2023—Acquisition Corp. (d)		297		297
4.125% Senior Secured Notes due 2024— Acquisition Corp. (e)		407		402
4.875% Senior Secured Notes due 2024— Acquisition Corp. (f)		247		246
6.75% Senior Notes due 2022—Acquisition Corp. (g)		630		630
Total debt (h)	$	2,818	$	2,811

(a)

Reflects $150 million of commitments under the Revolving Credit Facility, less letters of credit outstanding of approximately $12 million at both December 31, 2017 and September 30, 2017. There were no loans outstanding under the Revolving Credit Facility at December 31, 2017 or September 30, 2017. On January 31, 2018, Acquisition Corp. entered into a new revolving credit facility that replaced our then existing revolving credit facility in its entirety. See Note 12 of our Consolidated Financial Statements for further discussion.

(b)	Principal amount of $1.006 billion at both December 31, 2017 and September 30, 2017 less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $10 million and $10 million at December 31, 2017 and September 30, 2017, respectively.

(c)	Principal amount of $248 million less unamortized deferred financing costs of $2 million at December 31, 2017 and September 30, 2017, respectively.

(d)	Principal amount of $300 million less unamortized deferred financing costs of $3 million at both December 31, 2017 and September 30, 2017, respectively.

(e)

Face amount of €345 million. Above amounts represent the dollar equivalent of such notes at December 31, 2017 and September 30, 2017. Principal amount of $412 million and $407 million at December 31, 2017 and September 30, 2017, respectively, less unamortized deferred financing costs of $5 million at both December 31, 2017 and September 30, 2017.

(f)	Principal amount of $250 million at both December 31, 2017 and September 30, 2017 less unamortized deferred financing costs of $3 million and $4 million at December 31, 2017 and September 30, 2017, respectively.

(g)	Principal amount of $635 million less unamortized deferred financing costs of $5 million at both December 31, 2017 and September 30, 2017, respectively.

(h)	Principal amount of debt of $2.851 billion and $2.846 billion less unamortized discount of $5 million and $6 million and unamortized deferred financing costs of $28 million and $29 million at December 31, 2017 and September 30, 2017, respectively.