Debt

Debt with a contractual term of one year or less is generally classified as short-term debt and consisted of the following (in thousands):



	April 1, 2018		December 31, 2017		March 26, 2017
Unsecured commercial paper	$	1,036,976	$	1,273,482	$	953,357
Total short-term debt	$	1,036,976	$	1,273,482	$	953,357

Debt with a contractual term greater than one year is generally classified as long-term debt and consisted of the following (in thousands):



	April 1, 2018			December 31, 2017			March 26, 2017
Secured debt (Note 11)
Asset-backed Canadian commercial paper conduit facility	$	158,162		$	174,779		$	141,013
Asset-backed U.S. commercial paper conduit facilities	281,311			279,457			286,205
Asset-backed securitization debt	285,130			353,085			686,396
Less: unamortized discount and debt issuance costs	(337		)	(461		)	(1,022		)
Total secured debt	724,266			806,860			1,112,592

Unsecured notes (at par value)
1.55% Medium-term notes due in 2017, issued November 2014	—			—			400,000
6.80% Medium-term notes due in 2018, issued May 2008	877,488			877,488			877,488
2.25% Medium-term notes due in 2019, issued January 2016	600,000			600,000			600,000
Floating-rate Medium-term notes due in 2019, issued March 2017^(a)	150,000			150,000			150,000
2.40% Medium-term notes due in 2019, issued September 2014	600,000			600,000			600,000
2.15% Medium-term notes due in 2020, issued February 2015	600,000			600,000			600,000
2.40% Medium-term notes due in 2020, issued March 2017	350,000			350,000			350,000
2.85% Medium-term notes due in 2021, issued January 2016	600,000			600,000			600,000
2.55% Medium-term notes due in 2022, issued June 2017	400,000			400,000			—
3.35% Medium-term notes due in 2023, issued February 2018	350,000			—			—
3.50% Senior unsecured notes due in 2025, issued July 2015	450,000			450,000			450,000
4.625% Senior unsecured notes due in 2045, issued July 2015	300,000			300,000			300,000
Less: unamortized discount and debt issuance costs	(20,564		)	(19,821		)	(22,222		)
Gross long-term debt	5,981,190			5,714,527			6,017,858
Less: current portion of long-term debt, net of unamortized discount and debt issuance costs	(1,872,679		)	(1,127,269		)	(697,061		)
Total long-term debt	$	4,108,511		$	4,587,258		$	5,320,797

(a) Floating interest rate based on LIBOR plus 35 bps.