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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 30, 2018
Property, plant and equipment [abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT
US$ MILLIONS
Utilities
Assets
 
Transport
Assets
 
Energy
Assets
 
Total
Assets
Gross Carrying Amount:
 
 
 
 
 
 
 
Balance at January 1, 2017
$
2,895

 
$
2,362

 
$
2,380

 
$
7,637

Additions, net of disposals
349

 
104

 
95

 
548

Non-cash (disposals), net of additions
—

 
—

 
(14
)
 
(14
)
Acquisitions through business combinations(1)
—

 
—

 
100

 
100

Net foreign currency exchange differences
227

 
191

 
68

 
486

Balance at December 31, 2017
$
3,471

 
$
2,657

 
$
2,629

 
$
8,757

Additions, net of disposals
230

 
28

 
48

 
306

Acquisitions through business combinations(1)

487

 
—

 
—

 
487

Non-cash (disposals), net of additions
(23
)
 
(21
)
 
—

 
(44
)
Net foreign currency exchange differences
(86
)
 
(130
)
 
(48
)
 
(264
)
Balance at June 30, 2018
$
4,079

 
$
2,534

 
$
2,629

 
$
9,242

Accumulated depreciation:
 
 
 
 
 
 
 
Balance at January 1, 2017
$
(383
)
 
$
(517
)
 
$
(258
)
 
$
(1,158
)
Depreciation expense
(118
)
 
(147
)
 
(117
)
 
(382
)
Non-cash disposals
19

 
21

 
—

 
40

Disposals
—

 
—

 
5

 
5

Net foreign currency exchange differences
(28
)
 
(44
)
 
(13
)
 
(85
)
Balance at December 31, 2017
$
(510
)
 
$
(687
)
 
$
(383
)
 
$
(1,580
)
Depreciation expense
(70
)
 
(73
)
 
(65
)
 
(208
)
Disposals
2

 
13

 
—

 
15

Net foreign currency exchange differences
6

 
35

 
8

 
49

Balance at June 30, 2018
$
(572
)
 
$
(712
)
 
$
(440
)
 
$
(1,724
)
Accumulated fair value adjustments:
 
 
 
 
 
 
 
Balance at January 1, 2017
$
1,043

 
$
782

 
$
352

 
$
2,177

Fair value adjustments
137

 
24

 
257

 
418

Net foreign currency exchange differences
78

 
67

 
20

 
165

Balance at December 31, 2017
$
1,258

 
$
873

 
$
629

 
$
2,760

Net foreign currency exchange differences
(2
)
 
(43
)
 
(12
)
 
(57
)
Balance at June 30, 2018
$
1,256

 
$
830

 
$
617

 
$
2,703

Net book value:
 
 
 
 
 
 
 
December 31, 2017
$
4,219

 
$
2,843

 
$
2,875

 
$
9,937

June 30, 2018
$
4,763

 
$
2,652

 
$
2,806

 
$
10,221

1.
Refer to Note 5 Acquisition of Businesses.