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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [abstract] |  |  |  |  |  |
Weighted average shares used in basic EPS calculation |  | 1,250.0 | 1,247.8 |  | 1,261.1 |
EPS | [1] | £ 0.685 | £ 0.661 | [2] | £ 1.557 | [2]
Weighted average shares used in diluted EPS calculation |  | 1,260.6 | 1,261.2 |  | 1,275.8 |
Diluted EPS | [1] | £ 0.679 | £ 0.654 | [2] | £ 1.539 | [2]
Continuing Operation [member] |  |  |  |  |  |
Earnings per share [abstract] |  |  |  |  |  |
Earnings | [3],[4] | £ 860.1 | £ 698.2 |  | £ 1,726.6 |
Weighted average shares used in basic EPS calculation | [3] | 1,250.0 | 1,247.8 |  | 1,261.1 |
EPS | [3] | £ 0.688 | £ 0.560 |  | £ 1.369 |
Diluted earnings | [3] | £ 860.1 | £ 698.2 |  | £ 1,726.6 |
Weighted average shares used in diluted EPS calculation | [3] | 1,260.6 | 1,261.2 |  | 1,275.8 |
Diluted EPS | [3] | £ 0.682 | £ 0.554 |  | £ 1.353 |
Discontinued operations [member] |  |  |  |  |  |
Earnings per share [abstract] |  |  |  |  |  |
Earnings | [4] | £ (3.8) | £ 126.4 |  | £ 237.1 |
Weighted average shares used in basic EPS calculation |  | 1,250.0 | 1,247.8 |  | 1,261.1 |
EPS | [3] | £ (0.003) | £ 0.101 |  | £ 0.188 |
Diluted earnings |  | £ (3.8) | £ 126.4 |  | £ 237.1 |
Weighted average shares used in diluted EPS calculation |  | 1,260.6 | 1,261.2 |  | 1,275.8 |
Diluted EPS | [3] | £ (0.003) | £ 0.1 |  | £ 0.186 |
Continued and discontinued operations [member] |  |  |  |  |  |
Earnings per share [abstract] |  |  |  |  |  |
Earnings | [3],[4] | £ 856.3 | £ 824.6 |  | £ 1,963.7 |
Weighted average shares used in basic EPS calculation | [3] | 1,250.0 | 1,247.8 |  | 1,261.1 |
EPS | [3] | £ 0.685 | £ 0.661 |  | £ 1.557 |
Diluted earnings | [3] | £ 856.3 | £ 824.6 |  | £ 1,963.7 |
Weighted average shares used in diluted EPS calculation | [3] | 1,260.6 | 1,261.2 |  | 1,275.8 |
Diluted EPS | [3] | £ 0.679 | £ 0.654 |  | £ 1.539 |
[1] | Figures have been restated, as described in the accounting policies.
[2] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[3] | Earnings figures have been restated as described in the accounting policies.
[4] | Earnings is equivalent to profit for the year attributable to equity holders of the parent.

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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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition 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), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_a&doctype=Standard -URIDate 2019-03-27 + Details
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