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Group statement of changes in equity (Parenthetical) - USD ($) $ in Millions | Sep. 01, 2017 | Feb. 03, 2016
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Coal & Allied Industries Limited [member] |  |
Additional ownership percentage acquired in subsidiary |  | 20.00%
Ownership percentage in subsidiary |  | 100.00%
Ownership interest in subsidiary sold | 100.00% |
Hunter valley operations [member] |  |
Percentage of ownership interest exchanged in joint venture |  | 32.40%

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