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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, 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.