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Basis of preparation and accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Text Block1 [Abstract] |
Estimated Useful Life of Assets | Depreciation is calculated on a straight-line basis over the estimated useful life of the assets as follows:
Freehold buildings |  | : |  | 50 years
Leasehold land, buildings and improvements |  | : |  | Shorter of 15 to 50 years or lease term
Plant and machinery |  | : |  | 3 to 20 years
Office furniture, fittings and equipment |  | : |  | 3 to 20 years
Motor and transport vehicles |  | : |  | 3.5 to 15 years

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- Definition The disclosure of estimated useful lives of property plant and equipment. + References No definition available. + Details
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