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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)
 
June 30, 2019
 
December 31, 2018
Gross Carrying Amount:
 
 
 
 
Beginning Balance
 
$
8,415

 
$
3,425

Additions
 
594

 
500

Disposals
 
(143
)
 
(131
)
Acquisitions through business combinations (1)
 
6,141

 
4,913

Transfers and assets reclassified as held for sale (2)
 
(223
)
 
(38
)
Changes in accounting policy
 
978

 
—

Net foreign currency exchange differences
 
105

 
(254
)
Ending Balance
 
$
15,867

 
$
8,415

Accumulated Depreciation and Impairment
 
 
 
 
Beginning Balance
 
$
(1,468
)
 
$
(895
)
Depreciation/depletion/impairment expense (4)
 
(582
)
 
(720
)
Disposals
 
62

 
62

Transfers and assets reclassified as held for sale (2)
 
28

 
2

Net foreign currency exchange differences
 
(48
)
 
83

Ending Balance
 
$
(2,008
)
 
$
(1,468
)
Net Book Value (3)
 
$
13,859

 
$
6,947

____________________________________
(1) 
See Note 3 for additional information.
(2) 
See Note 8 for additional information.
(3) 
Includes right-of-use assets of $1,144 million as at June 30, 2019.
(4) 
Includes $63 million of impairment expense for the three and six months ended June 30, 2019 resulting from a write-down of certain vessels related to our investment in Teekay Offshore.