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Share capital and other equity - Paid-in equity (Details) £ / shares in Units, $ / shares in Units, £ in Millions, $ in Millions | Dec. 31, 2021 GBP (£) £ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 GBP (£)
--- | --- | --- | --- | --- | ---
Borrowings |  |  |  |  |
Equity | £ 41,803 |  | £ 43,824 | £ 43,556 |
Maximum | Instruments are converted to into ordinary shares at fixed price |  |  |  |  |
Borrowings |  |  |  |  |
CET1 ratio (as a percent) | 7.00% | 7.00% |  |  |
Paid-in equity |  |  |  |  |
Borrowings |  |  |  |  |
Equity | £ 3,890 |  | £ 4,999 | 4,058 | £ 4,058
Paid-in equity | Additional tier 1 note callable August, 2020, USD |  |  |  |  |
Borrowings |  |  |  |  |
Equity |  |  |  | £ 1,277 |
Notional amount of financial assets | $ |  | $ 2,000 |  |  |
Interest rate | 7.50% | 7.50% | 7.50% | 7.50% |
Conversion rate | $ / shares |  | $ 3.606 |  |  |
Par value | £ / shares | £ 1 |  |  |  |
Paid-in equity | Additional tier 1 note callable August, 2025, USD |  |  |  |  |
Borrowings |  |  |  |  |
Equity | £ 735 |  | £ 735 | £ 735 |
Notional amount of financial assets | $ |  | $ 1,150 |  |  |
Interest rate | 8.00% | 8.00% | 8.00% | 8.00% |
Paid-in equity | Additional tier 1 note callable August, 2021, USD |  |  |  |  |
Borrowings |  |  |  |  |
Equity |  |  | £ 2,046 | £ 2,046 |
Notional amount of financial assets | $ |  | $ 2,650 |  |  |
Interest rate | 8.625% | 8.625% | 8.625% | 8.625% |
Conversion rate | $ / shares |  | $ 2.284 |  |  |
Par value | £ / shares | £ 1 |  |  |  |
Paid-in equity | Additional tier 1 note callable December 2025 - June, 2026, USD |  |  |  |  |
Borrowings |  |  |  |  |
Equity | £ 1,220 |  | £ 1,220 |  |
Notional amount of financial assets | $ |  | $ 1,500 |  |  |
Interest rate | 6.00% | 6.00% | 6.00% | 6.00% |
Conversion rate | £ / shares | £ 1.754 |  |  |  |
Par value | £ / shares | £ 1 |  |  |  |
Paid-in equity | Additional tier1 note callable May - November 2027, GBP |  |  |  |  |
Borrowings |  |  |  |  |
Equity | £ 998 |  | £ 998 |  |
Notional amount of financial assets | £ 1,000 |  |  |  |
Interest rate | 5.125% | 5.125% |  |  |
Conversion rate | £ / shares | £ 1.754 |  |  |  |
Par value | £ / shares | £ 1 |  |  |  |
Paid-in equity | Additional tier 1 notes, march 2021 issuance, GBP |  |  |  |  |
Borrowings |  |  |  |  |
Equity | £ 399 |  |  |  |
Notional amount of financial assets | £ 400 |  |  |  |
Conversion rate | £ / shares | £ 1.754 |  |  |  |
Par value | £ / shares | £ 1 |  |  |  |
Paid-in equity | Additional tier 1 notes, June 2021 issuance, USD |  |  |  |  |
Borrowings |  |  |  |  |
Equity | £ 538 |  |  |  |
Notional amount of financial assets | $ |  | $ 750 |  |  |
Conversion rate | £ / shares | £ 1.754 |  |  |  |
Par value | £ / shares | £ 1 |  |  |  |

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