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Group statement of changes in equity (Parenthetical) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Statement of changes in equity [abstract] |
Sharebased Payment Transactions Reclassification Of Cash Settled Awards | $ (3)

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- Definition Sharebased payment transactions reclassification of cash settled awards. + References No definition available. + Details
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