- Headline Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disclosure of earnings per share [Abstract]
Profit (loss) attributable to equity shareholders	$ 114	$ 33	$ 133
Net impairment and derecognition of assets	7	92	102
Net loss (profit) on disposal of assets	1	22	32
Taxation	(2)	(48)	(47)
Headline earnings (loss)	$ 120	$ 99	$ 220
Basic headline earnings (loss) per share (cents per share)	$ 29	$ 24	$ 53
Diluted headline earnings (loss) per share (cents per share)	$ 29	$ 24	$ 53

Basic Headline Earnings (Loss) per Share

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Diluted Headline Earnings (Loss) per Share

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Disclosure of earnings per share [Abstract]

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Earnings (Loss) Per Share, Income Tax Expense (Income)

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- Definition

Headline Earnings (Loss) Attributable To Ordinary Equity Holders Of Parent Entity, Excluding Dilutive Effects

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- Definition

The gains (losses) on disposals of non-current assets. [Refer: Non-current assets]

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The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

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The amount recognised resulting from the write-down of property, plant and equipment to its recoverable amount or reversals of those write-downs. [Refer: Property, plant and equipment]

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