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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment [Abstract] |
Summary of property, plant and equipment |
|  | Mining |  | Land |  | Plant |  | Capital |  |  |  |
|  | properties |  | and |  | and |  | works in |  |  |  |
|  | and leases (a) |  | buildings (b) |  | equipment |  | progress |  | Total |
Year ended 31 December 2017 | Note | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Net book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At 1 January 2017 |  |  | 10,848 |  |  | 7,316 |  |  | 35,706 |  |  | 4,985 |  |  | 58,855 |
Adjustment on currency translation (c) |  |  | 495 |  |  | 461 |  |  | 2,242 |  |  | 183 |  |  | 3,381 |
Adjustments to capitalised closure costs | 26 |  | 710 |  |  | - |  |  | - |  |  | - |  |  | 710 |
Interest capitalised (d) | 8 |  | - |  |  | - |  |  | - |  |  | 224 |  |  | 224 |
Additions |  |  | 230 |  |  | 41 |  |  | 646 |  |  | 3,834 |  |  | 4,751 |
Depreciation for the year (a) (e) |  |  | (673 | ) |  | (403 | ) |  | (3,122 | ) |  | - |  |  | (4,198 | )
Impairment charges, net of reversals (f) |  |  | (304 | ) |  | (2 | ) |  | (128 | ) |  | (1 | ) |  | (435 | )
Disposals |  |  | - |  |  | (57 | ) |  | (40 | ) |  | (26 | ) |  | (123 | )
Subsidiaries no longer consolidated (g) |  |  | (211 | ) |  | (95 | ) |  | (417 | ) |  | (26 | ) |  | (749 | )
Transfers and other movements (h) |  |  | 393 |  |  | 115 |  |  | 1,398 |  |  | (2,229 | ) |  | (323 | )
At 31 December 2017 |  |  | 11,488 |  |  | 7,376 |  |  | 36,285 |  |  | 6,944 |  |  | 62,093 |
– cost |  |  | 24,691 |  |  | 12,029 |  |  | 71,903 |  |  | 7,266 |  |  | 115,889 |
– accumulated depreciation and impairment |  |  | (13,203 | ) |  | (4,653 | ) |  | (35,618 | ) |  | (322 | ) |  | (53,796 | )
Non-current assets held under finance leases (i) |  |  | - |  |  | - |  |  | 37 |  |  | - |  |  | 37 |
Non-current assets pledged as security (j) |  |  | 3,307 |  |  | 410 |  |  | 5,308 |  |  | 3,278 |  |  | 12,303 |
|  | Mining |  | Land |  | Plant |  | Capital |  |  |  |
|  | properties |  | and |  | and |  | works in |  |  |  |
|  | and leases (a) |  | buildings (b) |  | equipment |  | progress |  | Total |
Year ended 31 December 2016 | Note | US$m |  | US$m |  | US$m |  | US$m |  | US$m |
Net book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At 1 January 2016 |  |  | 11,146 |  |  | 7,571 |  |  | 37,900 |  |  | 4,440 |  |  | 61,057 |
Adjustment on currency translation |  |  | 137 |  |  | 62 |  |  | 138 |  |  | 16 |  |  | 353 |
Adjustments to capitalised closure costs | 26 |  | (123 | ) |  | - |  |  | - |  |  | - |  |  | (123 | )
Interest capitalised (d) | 8 |  | - |  |  | - |  |  | - |  |  | 111 |  |  | 111 |
Additions |  |  | 237 |  |  | 47 |  |  | 537 |  |  | 2,307 |  |  | 3,128 |
Depreciation for the year (a) (e) |  |  | (760 | ) |  | (429 | ) |  | (3,378 | ) |  | - |  |  | (4,567 | )
Impairment charges, net of reversals (f) |  |  | (130 | ) |  | - |  |  | (112 | ) |  | (6 | ) |  | (248 | )
Disposals |  |  | (3 | ) |  | (169 | ) |  | (86 | ) |  | - |  |  | (258 | )
Subsidiaries no longer consolidated |  |  | (40 | ) |  | (88 | ) |  | (217 | ) |  | (14 | ) |  | (359 | )
Transfers and other movements (h) |  |  | 384 |  |  | 322 |  |  | 924 |  |  | (1,869 | ) |  | (239 | )
At 31 December 2016 |  |  | 10,848 |  |  | 7,316 |  |  | 35,706 |  |  | 4,985 |  |  | 58,855 |
– cost |  |  | 22,989 |  |  | 11,444 |  |  | 68,030 |  |  | 5,374 |  |  | 107,837 |
– accumulated depreciation and impairment |  |  | (12,141 | ) |  | (4,128 | ) |  | (32,324 | ) |  | (389 | ) |  | (48,982 | )
Non-current assets held under finance leases (i) |  |  | - |  |  | - |  |  | 38 |  |  | - |  |  | 38 |
Non-current assets pledged as security (j) |  |  | 3,310 |  |  | 423 |  |  | 5,332 |  |  | 2,104 |  |  | 11,169 |
(a) | At 31 December 2017, the net book value of capitalised production phase stripping costs totalled US$1,815 million, with US$1,374 million within Property, plant and equipment and a further US$441 million within Investments in equity accounted units (2016 total of US$1,967 million with US$1,511 million in Property, plant and equipment and a further
(e) | Assets within operations for which production is not expected to fluctuate significantly from one year to another or which have a physical life shorter than the related mine are depreciated on a straight-line basis as follows:
Land and buildings Land: not depreciated Buildings: five to 50 years Plant and equipment Other plant and equipment: three to 50 years Power assets: 25 to 50 years Capital work in progress: not depreciated
(f) | During 2017, impairment charges primarily related to Arygle Diamonds and Rössing Uranium (see note 6). During 2016, impairment charges primarily related to Argyle Diamonds.
(g) | During 2017, “Subsidiaries no longer consolidated” relates primarily to the disposal of Coal & Allied Industries Limited which completed on 1 September 2017 (see note 37).
(h) | “Transfers and other movements” includes reclassifications between categories, including transfers to assets of disposal groups held for sale.
(i) | The finance leases under which these assets are held are disclosed in note 23.
(j) | Excludes assets held under finance leases. Non-current assets pledged as security represent amounts pledged as collateral against US$4,677 million (2016: US$4,783 million) of loans, which are included in note 22.

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