other long-term assets (Tables)

6 Months Ended

Jun. 30, 2018

other long-term assets

Schedule of other long-term assets

As at (millions)	Note e	June 30, 2018		December 31, 2017		January 1, 2017
				(adjusted – Note 2(c))		(Note 2(c))
Pension assets		$	219	$	156	$	358
Costs incurred to obtain or fulfill a contract with a customer		106		107		93
Portfolio investments 1		53		41		62
Prepaid maintenance		57		57		62
Real estate joint venture advances	21(c)	60		47		21
Real estate joint ventures	21(c)	13		15		30
Other		125		105		107
		$	633	$	528	$	733

(1) Fair value measured at reporting date using significant other observable inputs (Level 2).

Schedule of costs incurred to obtain and fulfill contracts with customers

	Six-month periods ended June 30
(millions)	2018									2017									Year ended December 31, 2017
	Costs incurred to									Costs incurred to									Costs incurred to
	Obtain contracts with customers			Fulfill contracts with customers			Total			Obtain contracts with customers			Fulfill contracts with customers			Total			Obtain contracts with customers			Fulfill contracts with customers			Total
Balance, beginning of period
As previously reported	$	329		$	11		$	340		$	—		$	—		$	—		$	—		$	—		$	—
Transitional amount	—			—			—			295			8			303			295			8			303
As adjusted	329			11			340			295			8			303			295			8			303
Addition	144			4			148			133			3			136			304			4			308
Amortization	(140		)	(2		)	(142		)	(132		)	(1		)	(133		)	(270		)	(1		)	(271		)
Balance, end of period	$	333		$	13		$	346		$	296		$	10		$	306		$	329		$	11		$	340
Current 1	$	236		$	4		$	240		$	211		$	2		$	213		$	230		$	3		$	233
Non-current	97			9			106			85			8			93			99			8			107
	$	333		$	13		$	346		$	296		$	10		$	306		$	329		$	11		$	340

(1) Presented on the Consolidated statements of financial position in prepaid expenses.