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Earnings per share - Calculation of Basic and Diluted EPS (Detail) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Earnings per share [abstract]
Earnings	£ 1,062.9	£ 1,816.6		£ 1,400.1
Average shares used in basic EPS calculation	1,247.8	1,261.1		1,277.8
EPS	£ 0.852	£ 1.440	[1]	£ 1.096	[1]
Diluted earnings	£ 1,062.9	£ 1,816.6		£ 1,400.1
Average shares used in diluted EPS calculation	1,261.2	1,275.8		1,296.0
Diluted EPS	£ 0.843	£ 1.424	[1]	£ 1.080	[1]
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.

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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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