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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of commitments | At December 31, 2018, 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 | 62,967 |  | 3,255 |  | 9,262 |  | 2,389 |  | 4,571 |  | 5,963 |  | 37,527 |
Interest obligations 2 | 30,236 |  | 2,459 |  | 2,279 |  | 2,103 |  | 2,022 |  | 1,883 |  | 19,490 |
Purchase of services, pipe and other materials, including transportation 3,4 | 10,493 |  | 3,833 |  | 1,473 |  | 1,000 |  | 754 |  | 406 |  | 3,027 |
Operating leases | 1,079 |  | 132 |  | 134 |  | 100 |  | 98 |  | 93 |  | 522 |
Capital leases | 23 |  | 7 |  | — |  | — |  | 2 |  | 2 |  | 12 |
Maintenance agreements | 477 |  | 52 |  | 51 |  | 51 |  | 50 |  | 22 |  | 251 |
Land lease commitments | 651 |  | 21 |  | 21 |  | 21 |  | 21 |  | 22 |  | 545 |
Total | 105,926 |  | 9,759 |  | 13,220 |  | 5,664 |  | 7,518 |  | 8,391 |  | 61,374 |
1 | 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 | Includes debentures and term notes bearing interest at fixed, floating and fixed-to-floating rates.
3 | Includes capital and operating commitments.
4 | Consists primarily of gas transportation and storage contracts, firm capacity payments and gas purchase commitments, transportation, service and product purchase obligations, and power commitments.

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- Definition Tabular disclosure of information about obligations resulting from other commitments. + References No definition available. + Details
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