Earnings per share (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Earnings per share
(Loss) profit attributable to ordinary shareholders	£ (234)	£ 517	£ 1,942
Weighted average number of ordinary shares in issue - basic	70,434	70,160	71,053
Adjustment for share options and awards		701	663
Weighted average number of ordinary shares in issue - diluted	70,434	70,861	71,716
Basic (loss) earnings per share	£ (0.003)	£ 0.008	£ 0.027
Diluted (loss) earnings per share	£ (0.003)	£ 0.007	£ 0.027

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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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]]

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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