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ASSET RETIREMENT OBLIGATIONS
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
ASSET RETIREMENT OBLIGATIONS ASSET RETIREMENT OBLIGATIONS
 
Our ARO relate mostly to the retirement of pipelines, renewable power generation assets and obligations related to right-of way agreements and contractual leases for land use.

The discount rates used to estimate the present value of the expected future cash flows for the year ended December 31, 2021 ranged from 0.9% to 9.0% (2020 - 1.8% to 9.0%).

A reconciliation of movements in our ARO liabilities is as follows:
December 31,20212020
(millions of Canadian dollars)
Obligations at beginning of year496 520 
Liabilities disposed— — 
Liabilities incurred— — 
Liabilities settled(67)(30)
Change in estimate and other70 — 
Foreign currency translation adjustment(3)(6)
Accretion expense6 12 
Obligations at end of year502 496 
Presented as follows:
Accounts payable and other
160 56 
Other long-term liabilities
342 440 
502 496