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Operating expenses - Share-based payments (Details)
£ / shares in Units, £ in Millions, shares in Millions, Options in Millions, Option in Millions, EquityInstruments in Millions
 12 Months Ended
Dec. 31, 2021
GBP (£)
EquityInstruments
Options
£ / shares
shares
Dec. 31, 2020
GBP (£)
EquityInstruments
Option
£ / shares
shares
Dec. 31, 2019
GBP (£)
EquityInstruments
Option
£ / shares
shares
Sharesave      
Average exercise price      
At 1 January | £ / shares £ 1.64 £ 2.01 £ 2.18
Granted | £ / shares 1.80 1.12 1.78
Exercised | £ / shares 1.76 1.83 2.83
Cancelled | £ / shares 2.02 2.20 2.25
At 31 December | £ / shares £ 1.61 £ 1.64 £ 2.01
Shares under option      
At 1 January 96 84 75
Granted 24 35 25
Exercised (10)   (4)
Cancelled (15) (23) (12)
At 31 December 95 96 84
Vesting period 6 months    
Options exercisable 6 6.3 3.2
Weighted average share price | £ / shares £ 2.19 £ 1.57 £ 2.49
Weighted average remaining contractual life of outstanding share options 2 years 1 month 6 days 2 years 3 months 18 days 2 years 8 months 12 days
Fair value of options granted £ 17 £ 8 £ 11
Sharesave | Minimum      
Shares under option      
Exercise price of outstanding share options | £ / shares £ 1.12 £ 1.12 £ 1.68
Sharesave | Maximum      
Shares under option      
Exercise price of outstanding share options | £ / shares £ 2.27 £ 2.27 £ 2.91
Deferred performance awards      
Shares under option      
Vesting period 3 years    
Value at grant      
At 1 January £ 169 £ 196 £ 233
Granted 61 109 110
Forfeited (10) (5) (10)
Vested (88) (131) (137)
At 31 December £ 132 £ 169 £ 196
Shares awarded      
At 1 January (in shares) | EquityInstruments 77 76 92
Granted (in shares) | EquityInstruments 32 67 42
Forfeited (in shares) | EquityInstruments (5) (2) (4)
Vested/exercised (in shares) | EquityInstruments (39) (64) (54)
At 31 December (in shares) | EquityInstruments 65 77 76
Long-term incentives      
Value at grant      
At 1 January £ 50 £ 63 £ 85
Granted 6 14 15
Vested (12) (17) (12)
Lapsed   (10) (25)
At 31 December £ 44 £ 50 £ 63
Shares awarded      
At 1 January (in shares) | EquityInstruments 24 25 32
Granted (in shares) | EquityInstruments 3 10 6
Vested/exercised (in shares) | EquityInstruments (6) (7) (4)
Lapsed (in shares) | EquityInstruments   (4) (9)
At 31 December (in shares) | EquityInstruments 21 24 25
Options over shares      
At 1 January (in shares) | shares     2
Lapsed (in shares) | shares     (2)
Market value of awards vested and exercised £ 13 £ 13 £ 10
Vested options over shares exercisable | shares 0 0