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Dividend and earnings/(loss) per share (Details) shares in Millions, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2021 SFr / shares	May 31, 2021 USD ($)	Jun. 30, 2021 shares	Jun. 30, 2020 shares	Jun. 30, 2021 shares	Jun. 30, 2020 shares
Earnings per share [abstract]
Dividends (in CHF per share) | SFr / shares	SFr 0.10
Dividends | $		$ 54
Number of shares outstanding			490.0		490.0
Number of shares vested					0.8
Weighted average number of shares outstanding - basic (in shares)			490.0	489.0	489.9	488.8
Weighted average number of shares outstanding - diluted (in shares)			493.2	489.0	492.8	488.8
Potentially dilutive shares			3.2		2.9
Number of anti-dilutive shares				2.5		2.6

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- Definition

Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount

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The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]]

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The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding]

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The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

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