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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2019
Property, plant and equipment [abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT
(US$ MILLIONS)
 
Land
 
Building
 
Machinery and equipment
 
Mineral property assets and oil and gas properties
 
Vessels
 
Others
 
Right-of-use assets
 
Total assets
Gross Carrying Amount
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at January 1, 2018
 
$
103

 
$
397

 
$
1,310

 
$
1,516

 
$
—

 
$
99

 
$
—

 
$
3,425

Additions (cash and non-cash)
 
1

 
37

 
301

 
64

 
86

 
11

 
—

 
500

Dispositions
 
(3
)
 
(5
)
 
(95
)
 
(2
)
 
(19
)
 
(7
)
 
—

 
(131
)
Acquisitions through business combinations (1)
 
44

 
262

 
801

 
—

 
3,738

 
68

 
—

 
4,913

Transfers and assets reclassified as held for sale (2)
 
(12
)
 
(2
)
 
(13
)
 
1

 
(13
)
 
1

 
—

 
(38
)
Foreign currency translation
 
(6
)
 
(40
)
 
(81
)
 
(119
)
 
—

 
(8
)
 
—

 
(254
)
Balance at December 31, 2018
 
$
127

 
$
649

 
$
2,223

 
$
1,460

 
$
3,792

 
$
164

 
$
—

 
$
8,415

Additions (cash and non-cash)
 
1

 
346

 
582

 
88

 
210

 
69

 
233

 
1,529

Dispositions
 
(1
)
 
(78
)
 
(266
)
 
(345
)
 
—

 
(23
)
 
(59
)
 
(772
)
Acquisitions through business combinations (1)
 
523

 
2,886

 
2,677

 
—

 
—

 
263

 
228

 
6,577

Transfers and assets reclassified as held for sale (2)
 
(22
)
 
(107
)
 
(178
)
 
—

 
(31
)
 
(54
)
 
60

 
(332
)
Changes in accounting policy
 
—

 
—

 
—

 
—

 
—

 
—

 
978

 
978

Foreign currency translation
 
5

 
12

 
(3
)
 
69

 
(1
)
 
2

 
23

 
107

Balances at December 31, 2019
 
$
633

 
$
3,708

 
$
5,035

 
$
1,272

 
$
3,970

 
$
421

 
$
1,463

 
$
16,502

Accumulated Depreciation and Impairment
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at January 1, 2018
 
$
—

 
$
(44
)
 
$
(364
)
 
$
(450
)
 
$
—

 
$
(37
)
 
—

 
(895
)
Depreciation/depletion/impairment expense
 
—

 
(28
)
 
(192
)
 
(306
)
 
(182
)
 
(12
)
 
—

 
(720
)
Dispositions
 
—

 
1

 
55

 
—

 
3

 
3

 
—

 
62

Transfers and assets reclassified as held for sale (2)
 
—

 
1

 
2

 
—

 
—

 
(1
)
 
—

 
2

Foreign currency translation
 
—

 
5

 
23

 
50

 
—

 
5

 
—

 
83

Balances at December 31, 2018 (3) (4)
 
$
—

 
$
(65
)
 
$
(476
)
 
$
(706
)
 
$
(179
)
 
$
(42
)
 
$
—

 
$
(1,468
)
Depreciation/depletion/impairment expense
 
—

 
(80
)
 
(485
)
 
(61
)
 
(530
)
 
(48
)
 
(203
)
 
(1,407
)
Dispositions
 
—

 
21

 
123

 
81

 
—

 
14

 
24

 
263

Transfers and assets reclassified as held for sale (2)
 
—

 
17

 
53

 
—

 
3

 
4

 
(15
)
 
62

Foreign currency translation
 
—

 
1

 
(24
)
 
(36
)
 
1

 
1

 
(3
)
 
(60
)
Balances at December 31, 2019 (3) (4)
 
$
—

 
$
(106
)
 
$
(809
)
 
$
(722
)
 
$
(705
)
 
$
(71
)
 
$
(197
)
 
$
(2,610
)
Net book value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
$
127

 
$
584

 
$
1,747

 
$
754

 
$
3,613

 
$
122

 
$
—

 
$
6,947

December 31, 2019
 
$
633

 
$
3,602

 
$
4,226

 
$
550

 
$
3,265

 
$
350

 
$
1,266

 
$
13,892

____________________________________
(1) 
See Note 3 for additional information.
(2) 
Includes assets that were reclassified as held for sale and subsequently disposed. See Note 8 and Note 9 for additional information.
(3) 
Includes accumulated impairment losses of $14 million (2018: $5 million) for machinery and equipment, $271 million (2018: $258 million) for oil and gas properties and $184 million (2018: $nil) for vessels.
(4) 
As at December 31, 2019 a total of $48 million (2018: $331 million) of future development costs were included in the depletion calculation.

Included within PP&E are approximately $1,266 million of right-of-use assets and $2,807 million of assets subject to operating leases in which the partnership is a lessor as at December 31, 2019. During the year ended December 31, 2019, additions to right-of-use assets from acquisitions and new lease contracts were $461 million, partially offset by depreciation of $203 million. The right-of-use assets and assets subject to operating leases in which the partnership is a lessor by class of underlying asset as at December 31, 2019 and the depreciation expense of right-of-use assets by class of underlying asset for the year ended December 31, 2019 are outlined below:
(US$ MILLIONS)
 
Land
 
Building
 
Machinery and equipment
 
Mineral property assets and oil and gas properties
 
Vessels
 
Others
 
Total
Lessee
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Right-of-use asset
 
8

 
632

 
552

 
—

 
53

 
21

 
$
1,266

Depreciation expense
 
(1
)
 
(88
)
 
(91
)
 
—

 
(11
)
 
(12
)
 
$
(203
)
Lessor
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets subject to operating leases
 
—

 
—

 
313

 
—

 
2,494

 
—

 
$
2,807