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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2019
Property, plant and equipment [abstract]  
Disclosure of detailed information about property, plant and equipment
Depreciation of an asset commences when it is available for use. PP&E is depreciated for each component of the asset classes as follows:
Buildings
Up to 50 years
Leasehold improvements
Up to 40 years but not exceeding the term of the lease
Machinery and equipment
Up to 20 years
Vessels
Up to 35 years
Oil and gas related equipment
Units of production
(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: $331 million) of future development costs were included in the depletion calculation.
The right-of-use assets and assets subject to operating leases in which the partnership is a lessor by class of underlying asset as at December 31, 2019 and the depreciation expense of right-of-use assets by class of underlying asset for the year ended December 31, 2019 are outlined below:
(US$ 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