Earnings per share (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Earnings Per Share [Abstract]
Profit attributable to ordinary shareholders - basic and diluted	£ 2,025	£ 1,653	£ 1,739
Tax credit on distributions to other equity holders	50	51	51
Earnings per share	£ 2,075	£ 1,704	£ 1,790
Weighted average number of ordinary shares in issue - basic	72,025	71,989	71,426
Adjustment for share options and awards	670	662	704
Weighted average number of ordinary shares in issue - diluted	72,695	72,651	72,130
Basic earnings per share	£ 0.029	£ 0.024	£ 0.025
Diluted earnings per share	£ 0.029	£ 0.023	£ 0.025

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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The amount of tax credit attributable to ordinary shareholders offsetting profit after tax distributed to other equity holders.

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