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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2018
Property, plant and equipment [abstract]  
Disclosure of detailed information about property, plant and equipment
The following table summarizes the carrying amount of property, plant and equipment that would have been recognized had assets been carried under the cost model.
US$ MILLIONS
 
Dec. 31, 2018
 
Dec. 31, 2017
Utilities
 
$
3,407

 
$
2,961

Transport
 
1,741

 
1,970

Energy
 
4,189

 
2,246

Data Infrastructure
 
444

 
—

The following table summarizes the valuation techniques and significant inputs for Brookfield Infrastructure’s property, plant and equipment assets, categorized by segment.
 
 
Dec. 31, 2018
 
Dec. 31, 2017
Segment
 
Valuation
Technique
 
Discount
Rate
 
Terminal
Value
Multiple
 
Investment
Horizon
 
Valuation
Technique
 
Discount
Rate
 
Terminal
Value
Multiple
 
Investment
Horizon
Utilities
 
Discounted cash flow model
 
7% to 14%
 
8x to 22x
 
10 to 20 yrs
 
Discounted cash flow model
 
7% to 12%
 
7x to 21x
 
10 to 20 yrs
Transport
 
Discounted cash flow model
 
10% to 13%
 
9x to 14x
 
10 to 20 yrs
 
Discounted cash flow model
 
10% to 15%
 
9x to 14x
 
10 to 20 yrs
Energy
 
Discounted cash flow model
 
12% to 15%
 
10x to 14x
 
10 yrs
 
Discounted cash flow model
 
12% to 15%
 
8x to 13x
 
10 yrs
Data Infrastructure
 
Discounted cash flow model
 
13% to 15%
 
10x to 11x
 
10 yrs
 
N/A
 
N/A
 
N/A
 
N/A
US$ MILLIONS
 
Utility
Assets
 
Transport
Assets
 
Energy
Assets
 
Data Infrastructure 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) 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
 
441

 
77

 
140

 
4

 
662

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

 
—

 
(17
)
Acquisitions through business combinations(1)
 
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

 
 
 
 
 
 
 
 
 
 
 
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
 
(149
)
 
(147
)
 
(134
)
 
—

 
(430
)
Disposals
 
7

 
22

 
8

 
—

 
37

Non-cash disposals
 
(2
)
 
—

 
(1
)
 
—

 
(3
)
Net foreign currency exchange differences
 
41

 
68

 
18

 
—

 
127

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

 
$
(1,849
)
 
 
 
 
 
 
 
 
 
 
 
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

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 book value:
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
$
4,808

 
$
2,551

 
$
5,011

 
$
444

 
$
12,814

December 31, 2017
 
$
4,219

 
$
2,843

 
$
2,875

 
$
—

 
$
9,937

 
(1)
See Note 6, Acquisition of Businesses for additional information.