Other long-term obligations

12 Months Ended

Dec. 31, 2013

Other long-term obligations

5. Other long-term obligations

millions of dollars	2013		2012
Employee retirement benefits (note 4)(a)		1,448		2,717
Asset retirement obligations and other environmental liabilities (b)		1,258		957
Share-based incentive compensation liabilities (note 7)		140		117
Other obligations		245		192
Total other long-term obligations		3,091		3,983

(a) Total recorded employee retirement benefit obligations also include $53 million in current liabilities (2012 – $52 million).

(b) Total asset retirement obligations and other environmental liabilities also include $154 million in current liabilities (2012 – $168 million).

Asset retirement obligations incurred in the current period were Level 3 (unobservable inputs) fair value measurements. The following table summarizes the activity in the liability for asset retirement obligations:

millions of dollars	2013			2012
Balance as at January 1		966			936
Additions		251			61
Reductions due to property sales		-			(8	)
Accretion		105			86
Settlement		(85	)		(109	)
Balance as at December 31		1,237			966