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Operating leases (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Future Minimum Lease Payments Under Non-cancellable Operating Leases | Future minimum lease payments under non-cancellable operating leases are as follows:
|  | 2017 $m |  |  | 2016 $m |
Due within one year |  |  | 56 |  |  |  | 53 |
One to two years |  |  | 46 |  |  |  | 49 |
Two to three years |  |  | 45 |  |  |  | 43 |
Three to four years |  |  | 60 |  |  |  | 41 |
Four to five years |  |  | 30 |  |  |  | 58 |
More than five years |  |  | 297 |  |  |  | 346 |
|  |  | 534 |  |  |  | 590 |

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- Definition Disclosure of future minimum lease payments under operating leases. + References No definition available. + Details
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