Earnings per share (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Schedule of Earnings Per Share [Abstract]
Profit attributable to ordinary shareholders - basic and diluted	£ 1,942	£ 1,900	£ 2,075
Weighted average number of ordinary shares in issue - basic	71,053	71,257	72,025
Adjustment for share options and awards	663	612	670
Weighted average number of ordinary shares in issue - diluted	71,716	71,869	72,695
Basic earnings per share	£ 0.027	£ 0.026	£ 0.029
Diluted earnings per share	£ 0.027	£ 0.026	£ 0.029

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 equity. [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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