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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, 2020
Jun. 30, 2019
Dec. 31, 2019
Earnings per share [abstract]      
Weighted average shares used in basic EPS calculation [1] 1,224.7 1,249.1 1,250.0
EPS [2] £ (2.364) £ 0.265 £ 0.685
Weighted average shares used in diluted EPS calculation [1] 1,237.0 1,257.3 1,260.6
Diluted EPS [2] £ (2.364) £ 0.263 £ 0.679
Continuing Operation [member]      
Earnings per share [abstract]      
Earnings [1],[3] £ (2,889.0) £ 288.3 £ 860.1
Weighted average shares used in basic EPS calculation [1] 1,224.7 1,249.1 1,250.0
EPS [4] £ (2.359) £ 0.230 £ 68.8
Diluted earnings [1] £ (2,889.0) £ 288.3 £ 860.1
Weighted average shares used in diluted EPS calculation [1],[5] 1,224.7 1,257.3 1,260.6
Diluted EPS [6] £ (2.359) £ 0.299 £ 68.2
Discontinued operations [member]      
Earnings per share [abstract]      
Earnings [3] £ (6.8) £ 43.2 £ (3.8)
Weighted average shares used in basic EPS calculation 1,224.7 1,249.1 1,250.0
EPS £ (0.005) £ 0.035 £ (0.003)
Diluted earnings £ (6.8) £ 43.2 £ (3.8)
Weighted average shares used in diluted EPS calculation [5] 1,224.7 1,257.3 1,260.6
Diluted EPS £ (0.005) £ 0.034 £ (0.003)
Continued and discontinued operations [member]      
Earnings per share [abstract]      
Earnings [1],[3] £ (2,895.8) £ 331.5 £ 856.3
Weighted average shares used in basic EPS calculation [1] 1,224.7 1,249.1 1,250.0
EPS [4] £ (2.364) £ 0.265 £ 68.5
Diluted earnings £ (2,895.8) £ 331.5 £ 856.3
Weighted average shares used in diluted EPS calculation [5] 1,224.7 1,257.3 1,260.6
Diluted EPS [6] £ (2.364) £ 0.263 £ 67.9
[1] Earnings figures have been restated as described in the accounting policies.
[2] Figures have been restated as described in the accounting policies.
[3] Earnings is equivalent to (loss)/profit for the period attributable to equity holders of the parent.
[4] Earnings figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.
[5] The weighted average shares used in the basic EPS calculation has also been used for diluted EPS due to the anti-dilutive effect of the weighted average shares calculated for the diluted EPS calculation.
[6] Earnings figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.