2. Debt

Long-term debt includes the following unsecured senior debt as of February 3, 2018 and January 28, 2017:

Maturity (Dollars in Millions)	Effective Rate			Coupon Rate			Outstanding
2021		4.81	%		4.00	%	$	650
2023		3.25	%		3.25	%		350
2023		4.78	%		4.75	%		300
2025		4.25	%		4.25	%		650
2029		7.36	%		7.25	%		99
2033		6.05	%		6.00	%		166
2037		6.89	%		6.88	%		150
2045		5.57	%		5.55	%		450
		4.88	%				$	2,815

Long-term debt is net of unamortized debt discounts and deferred financing costs of $18 million at February 3, 2018 and $20 million at January 28, 2017.

Our long-term debt is classified as Level 1, financial instruments with unadjusted, quoted prices listed on active market exchanges. The estimated fair value of our long-term debt was $2.9 billion at February 3, 2018 and $2.7 billion at January 28, 2017.

On November 3, 2017, we amended and restated our existing $1.0 billion senior unsecured five-year revolving credit facility with various lenders that matures in November 2022. Among other things, the agreement includes a maximum leverage ratio financial covenant (which is consistent with the ratio under our prior credit agreement) and restrictions on liens and subsidiary indebtedness.

Our various debt agreements contain covenants including limitations on additional indebtedness and certain financial tests. As of February 3, 2018, we were in compliance with all covenants of the various debt agreements.

We also had outstanding trade letters of credit totaling approximately $48 million at February 3, 2018 issued under uncommitted lines with two banks.