Disclosure Of Financial Instruments [Text Block]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-06-23 |
|---|---|---|---|---|---|---|
| Disclosure of financial instruments [text block] | — | — | — | — | — | — |
| Disclosure of financial assets [text block] | — | — | — | — | — | — |
| Disclosure of financial assets [abstract] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Financial assets |
264,961,000,000
GBP
|
— | — |
351,378,000,000
GBP
|
— | — |
| Notional amount | — | — |
500,000,000
GBP
|
— | — |
500,000,000
GBP
|
| Income, expense, gains or losses of financial instruments [abstract] | ||||||
| Gains (losses) on financial instruments [abstract] | ||||||
| Gains (losses) on available-for-sale financial assets | — | — | — | — | — | — |
| Gains (losses) on remeasuring available-for-sale financial assets, before tax | — |
—
GBP
|
— | — |
1,000,000
GBP
|
— |
| Disclosure of credit risk [text block] | — | — | — | — | — | — |
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [text block] | — | — | — | — | — | — |
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [abstract] | ||||||
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] | ||||||
| Disclosure of credit risk exposure [text block] | — | — | — | — | — | — |
| Disclosure of credit risk exposure [abstract] | ||||||
| Disclosure of credit risk exposure [line items] | ||||||
| Disclosure of provision matrix [text block] | — | — | — | — | — | — |
| Disclosure of provision matrix [abstract] | ||||||
| Disclosure of provision matrix [line items] | ||||||
| Disclosure of financial assets that are either past due or impaired [text block] | — | — | — | — | — | — |
| Disclosure of financial assets that are either past due or impaired [abstract] | ||||||
| Disclosure of financial assets that are either past due or impaired [line items] | ||||||
| Disclosure of financial instruments by type of interest rate [text block] | — | — | — | — | — | — |
| Disclosure of financial instruments by type of interest rate [abstract] | ||||||
| Disclosure of financial instruments by type of interest rate [line items] | ||||||
| Disclosure of detailed information about borrowings [text block] | — | — | — | — | — | — |
| Disclosure of detailed information about borrowings [abstract] | ||||||
| Disclosure of detailed information about borrowings [line items] | ||||||
| Borrowings |
7,344,000,000
GBP
|
— | — |
9,684,000,000
GBP
|
— | — |
| Borrowings, interest rate | — | — |
0.05900
xbrli:pure
|
— | — |
0.059000
xbrli:pure
|