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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 30, 2019
Property, plant and equipment [abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT
US$ MILLIONS
Utilities
Assets
 
Transport
Assets
 
Energy
Assets
 
Data Infrastructure Assets
 
Total
Assets
Gross Carrying Amount:
 
 
 
 
 
 
 
 
 
Balance at January 1, 2018
$
3,471

 
$
2,657

 
$
2,629

 
$
—

 
$
8,757

Additions, net of disposals
441

 
77

 
140

 
4

 
662

Non-cash (disposals) additions
(19
)
 
(4
)
 
6

 
—

 
(17
)
Acquisitions through business combinations(2)
394

 
—

 
2,111

 
440

 
2,945

Net foreign currency exchange differences
(267
)
 
(245
)
 
(205
)
 
—

 
(717
)
Balance at December 31, 2018
$
4,020

 
$
2,485

 
$
4,681

 
$
444

 
$
11,630

Change in accounting policies(1)
21

 
356

 
197

 
633

 
1,207

Additions, net of disposals
204

 
60

 
185

 
3

 
452

Acquisitions through business combinations(2)
—

 
—

 
2,134

 
—

 
2,134

Non-cash (disposals) additions
(1
)
 
6

 
13

 
(21
)
 
(3
)
Net foreign currency exchange differences
(7
)
 
(15
)
 
131

 
(1
)
 
108

Balance at June 30, 2019
$
4,237

 
$
2,892

 
$
7,341

 
$
1,058

 
$
15,528

Accumulated depreciation:
 
 
 
 
 
 
 
 
 
Balance at January 1, 2018
$
(510
)
 
$
(687
)
 
$
(383
)
 
$
—

 
$
(1,580
)
Depreciation expense
(149
)
 
(147
)
 
(134
)
 
—

 
(430
)
Non-cash additions
(2
)
 
—

 
(1
)
 
—

 
(3
)
Disposals
7

 
22

 
8

 
—

 
37

Net foreign currency exchange differences
41

 
68

 
18

 
—

 
127

Balance at December 31, 2018
$
(613
)
 
$
(744
)
 
$
(492
)
 
$
—

 
$
(1,849
)
Depreciation expense
(86
)
 
(90
)
 
(164
)
 
(47
)
 
(387
)
Disposals
4

 
—

 
—

 
—

 
4

Non-cash (additions) disposals
(1
)
 
1

 
3

 
—

 
3

Net foreign currency exchange differences
2

 
6

 
(15
)
 
—

 
(7
)
Balance at June 30, 2019
$
(694
)
 
$
(827
)
 
$
(668
)
 
$
(47
)
 
$
(2,236
)
Accumulated fair value adjustments:
 
 
 
 
 
 
 
 
 
Balance at January 1, 2018
$
1,258

 
$
873

 
$
629

 
$
—

 
$
2,760

Fair value adjustments
220

 
18

 
224

 
—

 
462

Net foreign currency exchange differences
(77
)
 
(81
)
 
(31
)
 
—

 
(189
)
Balance at December 31, 2018
$
1,401

 
$
810

 
$
822

 
$
—

 
$
3,033

Net foreign currency exchange differences
2

 
(4
)
 
14

 
—

 
12

Balance at June 30, 2019
$
1,403

 
$
806

 
$
836

 
$
—

 
$
3,045

Net book value:
 
 
 
 
 
 
 
 
 
December 31, 2018
4,808

 
2,551

 
5,011

 
444

 
12,814

June 30, 2019(3)
$
4,946

 
$
2,871

 
$
7,509

 
$
1,011

 
$
16,337

1.
Refer to Note 2 Summary of Accounting Policies.
2.
Refer to Note 5 Acquisition of Businesses.
3.
Includes right-of-use assets of $21 million in our utilities segment, $348 million in our transport segment, $245 million in our energy segment and $582 million in our data infrastructure segment. Current lease liabilities of $111 million has been included in accounts payable and other and non-current lease liabilities of $1,127 million have been included in other liabilities in the Consolidated Statement of Financial Position.