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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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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.

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