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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Property Plant and Equipment


(CAD$ in millions)		Exploration and Evaluation				Mineral Properties				Land, Buildings, Plant and Equipment				Capitalized Production Stripping Costs				Construction In Progress				Total
At December 31, 2015
Cost		$	1,600			$	18,001			$	13,208			$	3,761			$	3,186			$	39,756
Accumulated depreciation			—				(4,776	)			(6,574	)			(1,615	)			—				(12,965	)

Net book value		$	1,600			$	13,225			$	6,634			$	2,146			$	3,186			$	26,791

Year ended December 31, 2016
Opening net book value		$	1,600			$	13,225			$	6,634			$	2,146			$	3,186			$	26,791
Additions			24				47				173				531				1,112				1,887
Disposals			—				—				(10	)			—				—				(10	)
Asset impairments (Note 6)			—				—				(26	)			—				(268	)			(294	)
Depreciation and amortization			—				(356	)			(657	)			(500	)			—				(1,513	)
Transfers between classifications			—				—				276				—				(276	)			—
Decommissioning and restoration provision change in estimate			—				633				26				—				—				659
Capitalized borrowing costs			—				91				—				—				175				266
Other			(9	)			—				(6	)			—				—				(15	)
Changes in foreign exchange rates			(2	)			(78	)			(58	)			(16	)			(22	)			(176	)

Closing net book value		$	1,613			$	13,562			$	6,352			$	2,161			$	3,907			$	27,595

At December 31, 2016
Cost		$	1,613			$	18,667			$	13,517			$	4,269			$	3,907			$	41,973
Accumulated depreciation			—				(5,105	)			(7,165	)			(2,108	)			—				(14,378	)

Net book value		$	1,613			$	13,562			$	6,352			$	2,161			$	3,907			$	27,595

Year ended December 31, 2017
Opening net book value		$	1,613			$	13,562			$	6,352			$	2,161			$	3,907			$	27,595
Additions			171				174				562				742				1,284				2,933
Disposals			—				—				(67	)			—				—				(67	)
Impairment reversal and (asset impairments) (Note 6)			—				207				(44	)			—				—				163
Depreciation and amortization			—				(368	)			(640	)			(566	)			—				(1,574	)
Transfers between classifications			—				(8	)			104				—				(96	)			—
Decommissioning and restoration provision change in estimate			—				501				24				—				—				525
Capitalized borrowing costs			—				102				—				—				231				333
Reclass of Waneta Dam and other			—				40				(394	)			—				—				(354	)
Changes in foreign exchange rates			(10	)			(240	)			(155	)			(39	)			(65	)			(509	)

Closing net book value		$	1,774			$	13,970			$	5,742			$	2,298			$	5,261			$	29,045

At December 31, 2017
Cost		$	1,774			$	19,329			$	12,948			$	4,561			$	5,261			$	43,873
Accumulated depreciation			—				(5,359	)			(7,206	)			(2,263	)			—				(14,828	)

Net book value		$	1,774			$	13,970			$	5,742			$	2,298			$	5,261			$	29,045