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Earnings per share - Calculation of Basic and Diluted EPS (Detail) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended			12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Dec. 31, 2017
Earnings per share [abstract]
Earnings	£ 672.4	£ 596.1		£ 1,816.6
Weighted average shares used in basic EPS calculation	1,250.5	1,266.2		1,261.1
EPS	£ 0.538	£ 0.471	[1]	£ 1.440	[1]
Diluted earnings	£ 672.4	£ 596.1		£ 1,816.6
Weighted average shares used in diluted EPS calculation	1,259.4	1,279.7		1,275.8
Diluted EPS	£ 0.534	£ 0.466	[1]	£ 1.424	[1]
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.

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- 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]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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