At December 31, 2017, we have commitments as detailed below.



	Total	Less than 1 year	2 years	3 years	4 years	5 years	Thereafter
(millions of Canadian dollars)
Annual debt maturities^1,2	62,927	2,831	6,273	6,722	2,505	8,839	35,757
Interest obligations^2,3	42,083	2,485	2,298	2,117	1,941	1,853	31,389
Purchase of services, pipe and other materials, including transportation^4,5	14,396	4,144	2,455	1,496	1,255	1,163	3,883
Operating leases	746	91	86	80	74	78	337
Capital leases	35	9	8	2	2	2	12
Maintenance agreements	322	38	32	17	15	15	205
Land lease commitments	405	15	16	16	16	16	326
Total	120,914	9,613	11,168	10,450	5,808	11,966	71,909

Includes debentures, term notes, commercial paper and credit facility draws based on the facility's maturity date and excludes short-term borrowings, debt discount, debt issue costs and capital lease obligations. We have the ability under certain debt facilities to call and repay the obligations prior to scheduled maturities. Therefore, the actual timing of future cash repayments could be materially different than presented above.


2	Excludes the debt issuance of US$800 million senior notes that occurred subsequent to December 31, 2017 (Note 30).


3	Includes debentures and term notes bearing interest at fixed, floating and fixed-to-floating rates.


4	Includes capital and operating commitments.


5	Consists primarily of gas transportation and storage contracts (EGD), firm capacity payments and gas purchase commitments (Spectra Energy), transportation, service and product purchase obligations (MEP), and power commitments (EEP).