v3.25.2
Earnings per share - summary of earnings per share calculations (Details) - GBP (£)
£ / shares in Units, £ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Earnings per share [abstract]    
Earnings per share - basic, Earnings £ 4,490 £ 4,471
Earnings per share - diluted, Earnings 4,490 4,471
Adjusted earnings per share - basic, Earnings 3,573 3,779
Adjusted earnings per share - diluted, Earnings 3,573 3,779
Headline basic earnings per share, Earnings 3,698 3,500
Headline diluted earnings per share, Earnings £ 3,698 £ 3,500
Earnings per share - basic (in shares) 2,194,000,000 2,223,000,000
Earnings per share - diluted (in shares) 2,205,000,000 2,232,000,000
Adjusted earnings per share - basic (in shares) 2,194,000,000 2,223,000,000
Adjusted earnings per share - diluted (in shares) 2,205,000,000 2,232,000,000
Headline earnings per share - basic (in shares) 2,194,000,000 2,223,000,000
Headline earnings per share - diluted (in shares) 2,205,000,000 2,232,000,000
Earnings per share, basic (in GBP per share) £ 2.046 £ 2.011
Earnings per share - diluted (in GBP per share) 2.036 2.003
Adjusted earnings per share - basic (in GBP per share) 1.629 1.700
Adjusted earnings per share - diluted (in GBP per share) 1.620 1.693
Headline earnings per share - basic (in GBP per share) 1.685 1.575
Headline earnings per share - diluted (in GBP per share) 1.677 1.568
Effect of the changes in provision in relation to the Approved Plans in Canada (in GBP per share) (0.191) 0
Adjusted diluted earnings per share (in GBP per share) £ 1.620 £ 1.693