Disclosure Of Financial Instruments [Text Block]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|
| Disclosure of financial instruments [text block] | — | — | — | — | — | — |
| Description of accounting policy for financial instruments [text block] |
|
— | — | — | — | — |
| Disclosure of financial assets [text block] |
|
— | — | — | — | — |
| Disclosure of financial assets [abstract] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Reconciliation of changes in allowance account for credit losses of financial assets [abstract] | ||||||
| Changes in allowance account for credit losses of financial assets [abstract] | ||||||
| Increase (decrease) in allowance account for credit losses of financial assets |
169,000,000
GBP
|
— | — |
222,000,000
GBP
|
— |
174,000,000
GBP
|
| Designated financial liabilities at fair value through profit or loss [abstract] | ||||||
| Accumulated increase (decrease) in fair value of financial liability, attributable to changes in credit risk of liability | — |
151,000,000
GBP
|
292,000,000
GBP
|
— |
165,000,000
GBP
|
— |
| Income, expense, gains or losses of financial instruments [abstract] | ||||||
| Gains (losses) on financial instruments [abstract] | ||||||
| Gains (losses) on financial assets at fair value through profit or loss, mandatorily measured at fair value |
284,000,000
GBP
|
— | — |
143,000,000
GBP
|
— |
493,000,000
GBP
|
| Gains (losses) on available-for-sale financial assets |
84,000,000
GBP
|
— | — |
60,000,000
GBP
|
— |
60,000,000
GBP
|
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments |
1,000,000
GBP
|
— | — |
—
GBP
|
— |
2,000,000
GBP
|
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income | — | — | — | — | — | — |
| Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax |
495,000,000
GBP
|
— | — |
2,631,000,000
GBP
|
— |
247,000,000
GBP
|
| Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax |
93,000,000
GBP
|
— | — |
59,000,000
GBP
|
— |
63,000,000
GBP
|
| Interest income and interest expense for financial assets or financial liabilities not at fair value through profit or loss [abstract] | ||||||
| Interest expense for financial liabilities not at fair value through profit or loss |
14,226,000,000
GBP
|
— | — |
3,740,000,000
GBP
|
— |
616,000,000
GBP
|
| Interest revenue for financial assets measured at amortised cost |
16,484,000,000
GBP
|
— | — |
5,512,000,000
GBP
|
— |
1,986,000,000
GBP
|
| Interest revenue for financial assets measured at fair value through other comprehensive income |
1,256,000,000
GBP
|
— | — |
601,000,000
GBP
|
— |
504,000,000
GBP
|
| Interest income on impaired financial assets accrued [abstract] | ||||||
| Interest income on impaired financial assets accrued |
117,000,000
GBP
|
— | — |
59,000,000
GBP
|
— |
61,000,000
GBP
|