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Condensed consolidated statement of changes in equity (unaudited) (Parenthetical) - GBP (£)
£ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Profit after tax £ 1,465 £ 384
Increase (decrease) due to changes in accounting policy [member] | IAS 12 update [member]    
Profit after tax £ 77 £ 84