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Earnings per share (Details) - GBP (£)
£ in Millions, shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings per share      
Profit/(loss) from continuing operations attributable to ordinary shareholders £ 2,674 £ (874) £ 2,877
Profit from discontinued operations attributable to ordinary shareholders 276 121 256
Profit/(loss) attributable to ordinary shareholders £ 2,950 £ (753) [1] £ 3,133 [1]
Weighted average number of shares      
Weighted average number of ordinary shares outstanding during the year 11,622 12,095 12,067
Effect of dilutive share options and convertible securities 45   35
Diluted weighted average number of ordinary shares outstanding during the year 11,667 12,095 12,102
[1] Comparative results have been re-presented from those previously published to reclassify certain items as discontinued operations as described in Note 8 to the consolidated financial statements.