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Dividends and earnings per share (Details) shares in Millions, $ in Millions			1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 27, 2024 SFr / shares	Feb. 27, 2023 SFr / shares	May 31, 2024 USD ($)	May 31, 2023 USD ($)	Jun. 30, 2024 shares	Jun. 30, 2023 shares	Jun. 30, 2024 shares	Jun. 30, 2023 shares
Earnings per share [abstract]
Dividend declared (in dollars per share) | SFr / shares	SFr 0.24	SFr 0.21
Dividends paid | $			$ 130	$ 116
Number of shares outstanding					494.5		494.5
Number of shares vested							1.2
Weighted average number of shares outstanding - basic (in shares)					494.5	493.2	494.1	492.8
Weighted average number of shares outstanding - diluted (in shares)					497.0	495.7	496.7	495.9
Potentially dilutive shares (in shares)					2.5	2.5	2.6	3.1

X

- Definition

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]]

+ References

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

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- Definition

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

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- Definition

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

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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