provisions (Tables)

12 Months Ended

Dec. 31, 2019


		Asset
		retirement		Employee-		Written put
(millions)	Note	obligation		related		options		Other		Total
As at January 1, 2018		$	351	$	36	$	82	$	120	$	589
Additions			6		124		184		95		409
Reversal			—		—		(15)		(7)		(22)
Use			(10)		(72)		—		(57)		(139)
Interest effect			(11)		—		10		—		(1)
Effects of foreign exchange, net			—		—		21		—		21
As at December 31, 2018		$	336	$	88	$	282	$	151	$	857
As at January 1, 2019
As previously reported		$	336	$	88	$	282	$	151	$	857
IFRS 16, Leases transitional amount	2(c)		—		—		—		(57)		(57)
As adjusted			336		88		282		94		800
Additions			15		64		—		105		184
Reversal			—		—		(17)		(6)		(23)
Use			(5)		(88)		(62)		(69)		(224)
Interest effect 1			149		—		11		—		160
Effects of foreign exchange, net			—		—		(18)		(1)		(19)
As at December 31, 2019		$	495	$	64	$	196	$	123	$	878
Current		$	11	$	59	$	191	$	27	$	288
Non-current			484		5		5		96		590
As at December 31, 2019		$	495	$	64	$	196	$	123	$	878

(1)

The difference of $138 (2018 – $(22)) between the asset retirement obligation interest effect in this table and the amount included in the amount disclosed in Note 9 is in respect of the change in the discount rates applicable to the provision, such difference being included in the cost of the associated asset(s) by way of being included with (netted against) the additions detailed in Note 17.