EQUITY ACCOUNTED INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2017

Interests In Other Entities [Abstract]

Disclosure of ownership interest, voting interest, and carrying value of joint ventures

The following table presents the ownership interest, voting interest, and carrying values of the partnership's equity accounted investments as at December 31, 2017 and 2016:

(US$ MILLIONS)	Economic interest				Voting interest				Carrying value
	2017		2016		2017		2016		2017		2016
Business services	28%-67%		28%-60%		28%-60%		28%-50%		$	212	$	80
Construction services	50%-90%		50%-90%		50%-90%		50	%	1		1
Industrial operations	50	%	—		50	%	—		102		—
Energy	14%-25%		14	%	29%-60%		29	%	294		85
Total									$	609	$	166

Disclosure of ownership interest, voting interest, and carrying value of associates

The following table presents the ownership interest, voting interest, and carrying values of the partnership's equity accounted investments as at December 31, 2017 and 2016:

(US$ MILLIONS)	Economic interest				Voting interest				Carrying value
	2017		2016		2017		2016		2017		2016
Business services	28%-67%		28%-60%		28%-60%		28%-50%		$	212	$	80
Construction services	50%-90%		50%-90%		50%-90%		50	%	1		1
Industrial operations	50	%	—		50	%	—		102		—
Energy	14%-25%		14	%	29%-60%		29	%	294		85
Total									$	609	$	166

Disclosure of change in equity investments

The following table represents the change in the balance of equity accounted investments:

(US$ MILLIONS)	2017			2016
Balance at beginning of year	$	166		$	492
Acquisitions through business combinations (1)	231			—
Additions	208			—
Dispositions (2)	—			(289		)
Share of net income	69			68
Share of other comprehensive income	(5		)	(79		)
Distributions received	(59		)	(25		)
Foreign currency translation	(1		)	(1		)
Balance at end of period	$	609		$	166

____________________________________

⁽¹⁾  See Note 3 for additional information.

⁽²⁾  Dispositions of equity accounted investments in 2016 relates to the sell down and reorganization of our Western Australia energy operations during the year. As a result, the partnership now consolidates a smaller portion of the interest of the institutional investors resulting in a decrease in the balance of equity accounted investment and a corresponding decrease in the interest of others.

Disclosure of interests in associates

The following tables present the gross amounts of revenue, net income, other comprehensive income and distributions from the partnership's equity accounted investments for the year ended December 31, 2017, 2016 and 2015:

	Year Ended December 31, 2017
	Total									Attributable to other ownership interests				Attributable to partnership
(US$ MILLIONS)	Revenue		Net income		OCI			Total		Comprehensive income		Distributions		Comprehensive income		Distributions
Business services	$	189	$	81	$	—		$	81	$	54	$	45	$	27	$	22
Construction services	208		—		—			—		—		—		—		—
Industrial operations	54		5		—			5		3		2		2		2
Energy	1,058		297		(38		)	259		224		170		35		35
Total	$	1,509	$	383	$	(38	)	$	345	$	281	$	217	$	64	$	59

	Year Ended December 31, 2016
	Total										Attributable to other ownership interests					Attributable to partnership
(US$ MILLIONS)	Revenue		Net income		OCI			Total			Comprehensive income			Distributions		Comprehensive income			Distributions
Business services	$	120	$	49	$	—		$	49		$	32		$	38	$	17		$	20
Construction services	283		—		—			—			—			—		—			—
Energy	941		99		(138		)	(39		)	(35		)	17		(4		)	5
Total	$	1,344	$	148	$	(138	)	$	10		$	(3	)	$	55	$	13		$	25

	Year Ended December 31, 2015
	Total									Attributable to other ownership interests				Attributable to partnership
(US$ MILLIONS)	Revenue		Net income			OCI		Total		Comprehensive income		Distributions		Comprehensive income		Distributions
Business services	$	232	$	55		$	—	$	55	$	36	$	37	$	19	$	18
Construction services	332		3			—		3		—		—		3		—
Energy	548		(37		)	178		141		74		31		67		28
Total	$	1,112	$	21		$	178	$	199	$	110	$	68	$	89	$	46

The following tables present the gross assets and liabilities of the partnership's equity accounted investments:

	Year Ended December 31, 2017
	Total														Attributable to
(US$ MILLIONS)	Current assets		Non-current assets		Total assets		Current liabilities		Non-current liabilities		Total liabilities		Total net assets		Other ownership interests		Partnership's share (2)
Business services	$	97	$	488	$	585	$	139	$	206	$	345	$	240	$	93	$	147
Construction services	262		11		273		215		56		271		2		1		1
Industrial operations	44		342		386		23		159		182		204		102		102
Energy	799		8,441		9,240		1,370		6,431		7,801		1,439		1,173		266
Total	$	1,202	$	9,282	$	10,484	$	1,747	$	6,852	$	8,599	$	1,885	$	1,369	$	516

	Year Ended December 31, 2016
	Total														Attributable to
(US$ MILLIONS)	Current assets		Non-current assets		Total assets		Current liabilities		Non-current liabilities		Total liabilities		Total net assets		Other ownership interests		Partnership's share (2)
Business services	$	69	$	96	$	165	$	47	$	87	$	134	$	31	$	17	$	14
Construction services	193		22		215		136		77		213		2		1		1
Energy (1)	355		3,784		4,139		511		3,292		3,803		336		304		32
Total	$	617	$	3,902	$	4,519	$	694	$	3,456	$	4,150	$	369	$	322	$	47

____________________________________

⁽¹⁾  In April 2016, the partnership sold a 12% interest in an Energy business for $79 million. The partnership also picked up a lower proportionate share in the business in 2016 resulting from a reorganization and sell down to our institutional partners. Following the sale and reorganization, the partnership continued to hold a 9% economic interest and a 29% voting interest, giving the partnership significant influence over the investee. Accordingly, the partnership accounts for the investments using the equity method.

⁽²⁾  Attributable to limited partner and redemption-exchange unitholders.

Disclosure of interests in joint ventures

The following tables present the gross assets and liabilities of the partnership's equity accounted investments:

	Year Ended December 31, 2017
	Total														Attributable to
(US$ MILLIONS)	Current assets		Non-current assets		Total assets		Current liabilities		Non-current liabilities		Total liabilities		Total net assets		Other ownership interests		Partnership's share (2)
Business services	$	97	$	488	$	585	$	139	$	206	$	345	$	240	$	93	$	147
Construction services	262		11		273		215		56		271		2		1		1
Industrial operations	44		342		386		23		159		182		204		102		102
Energy	799		8,441		9,240		1,370		6,431		7,801		1,439		1,173		266
Total	$	1,202	$	9,282	$	10,484	$	1,747	$	6,852	$	8,599	$	1,885	$	1,369	$	516

	Year Ended December 31, 2016
	Total														Attributable to
(US$ MILLIONS)	Current assets		Non-current assets		Total assets		Current liabilities		Non-current liabilities		Total liabilities		Total net assets		Other ownership interests		Partnership's share (2)
Business services	$	69	$	96	$	165	$	47	$	87	$	134	$	31	$	17	$	14
Construction services	193		22		215		136		77		213		2		1		1
Energy (1)	355		3,784		4,139		511		3,292		3,803		336		304		32
Total	$	617	$	3,902	$	4,519	$	694	$	3,456	$	4,150	$	369	$	322	$	47

____________________________________

⁽¹⁾  In April 2016, the partnership sold a 12% interest in an Energy business for $79 million. The partnership also picked up a lower proportionate share in the business in 2016 resulting from a reorganization and sell down to our institutional partners. Following the sale and reorganization, the partnership continued to hold a 9% economic interest and a 29% voting interest, giving the partnership significant influence over the investee. Accordingly, the partnership accounts for the investments using the equity method.

⁽²⁾  Attributable to limited partner and redemption-exchange unitholders.

The following tables present the gross amounts of revenue, net income, other comprehensive income and distributions from the partnership's equity accounted investments for the year ended December 31, 2017, 2016 and 2015:

	Year Ended December 31, 2017
	Total									Attributable to other ownership interests				Attributable to partnership
(US$ MILLIONS)	Revenue		Net income		OCI			Total		Comprehensive income		Distributions		Comprehensive income		Distributions
Business services	$	189	$	81	$	—		$	81	$	54	$	45	$	27	$	22
Construction services	208		—		—			—		—		—		—		—
Industrial operations	54		5		—			5		3		2		2		2
Energy	1,058		297		(38		)	259		224		170		35		35
Total	$	1,509	$	383	$	(38	)	$	345	$	281	$	217	$	64	$	59

	Year Ended December 31, 2016
	Total										Attributable to other ownership interests					Attributable to partnership
(US$ MILLIONS)	Revenue		Net income		OCI			Total			Comprehensive income			Distributions		Comprehensive income			Distributions
Business services	$	120	$	49	$	—		$	49		$	32		$	38	$	17		$	20
Construction services	283		—		—			—			—			—		—			—
Energy	941		99		(138		)	(39		)	(35		)	17		(4		)	5
Total	$	1,344	$	148	$	(138	)	$	10		$	(3	)	$	55	$	13		$	25

	Year Ended December 31, 2015
	Total									Attributable to other ownership interests				Attributable to partnership
(US$ MILLIONS)	Revenue		Net income			OCI		Total		Comprehensive income		Distributions		Comprehensive income		Distributions
Business services	$	232	$	55		$	—	$	55	$	36	$	37	$	19	$	18
Construction services	332		3			—		3		—		—		3		—
Energy	548		(37		)	178		141		74		31		67		28
Total	$	1,112	$	21		$	178	$	199	$	110	$	68	$	89	$	46

Disclosure of fair value of equity accounted investments

The fair value based on the publicly listed price in comparison to the partnership's carrying value is as follows:

	December 31, 2017				December 31, 2016
(US$ MILLIONS)	Public price		Carrying value		Public price		Carrying value
Business services	$	44	$	—	$	39	$	—
Energy	242		201		—		—
Total	$	286	$	201	$	39	$	—