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Fair value estimation - Maturity of financial instruments (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair value estimation |  |
Net inflow/(outflow) | £ (149) | £ (60)
Less than 1 year |  |
Fair value estimation |  |
Net inflow/(outflow) | (35) | (10)
Between 1 and 2 years |  |
Fair value estimation |  |
Net inflow/(outflow) | (64) | (12)
Between 2 and 5 years |  |
Fair value estimation |  |
Net inflow/(outflow) | (35) | (28)
Over 5 years |  |
Fair value estimation |  |
Net inflow/(outflow) | (15) | (10)
Cross-currency interest rate swaps |  |
Fair value estimation |  |
Outflow | (1,982) | (661)
Inflow | 1,818 | 610
Cross-currency interest rate swaps | Less than 1 year |  |
Fair value estimation |  |
Outflow | (64) | (18)
Inflow | 20 | 12
Cross-currency interest rate swaps | Between 1 and 2 years |  |
Fair value estimation |  |
Outflow | (460) | (14)
Inflow | 390 | 5
Cross-currency interest rate swaps | Between 2 and 5 years |  |
Fair value estimation |  |
Outflow | (909) | (471)
Inflow | 874 | 445
Cross-currency interest rate swaps | Over 5 years |  |
Fair value estimation |  |
Outflow | (549) | (158)
Inflow | 534 | 148
Interest rate swaps |  |
Fair value estimation |  |
Outflow | (4) | (20)
Inflow | 19 | 9
Interest rate swaps | Less than 1 year |  |
Fair value estimation |  |
Outflow | (1) | (8)
Inflow | 10 | 2
Interest rate swaps | Between 1 and 2 years |  |
Fair value estimation |  |
Outflow | (3) | (6)
Inflow | 9 | 3
Interest rate swaps | Between 2 and 5 years |  |
Fair value estimation |  |
Outflow |  | (6)
Inflow |  | 4
Foreign exchange swaps |  |
Fair value estimation |  |
Outflow | (15) | (385)
Inflow | 15 | 387
Foreign exchange swaps | Less than 1 year |  |
Fair value estimation |  |
Outflow | (15) | (385)
Inflow | £ 15 | 387
Foreign exchange forwards |  |
Fair value estimation |  |
Outflow |  | (34)
Inflow |  | 34
Foreign exchange forwards | Less than 1 year |  |
Fair value estimation |  |
Outflow |  | (34)
Inflow |  | £ 34

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