Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
1,548,000,000
GBP
|
1,734,000,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
1,545,000,000
GBP
|
1,646,000,000
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements |
201,000,000
GBP
|
172,000,000
GBP
|
— |
| Categories of financial assets [abstract] | |||
| Financial assets at fair value through other comprehensive income [abstract] | |||
| Financial assets at fair value through other comprehensive income |
5,851,000,000
GBP
|
8,950,000,000
GBP
|
— |
| Financial assets at amortised cost |
506,000,000
GBP
|
1,163,000,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Net defined benefit asset |
1,572,000,000
GBP
|
495,000,000
GBP
|
— |
| Derivative financial assets |
1,681,000,000
GBP
|
3,406,000,000
GBP
|
— |
| Loans and advances | — | — | — |
| Loans and advances to banks |
1,169,000,000
GBP
|
1,682,000,000
GBP
|
— |
| Loans and advances to customers |
210,094,000,000
GBP
|
208,750,000,000
GBP
|
— |
| Cash and bank balances at central banks |
48,139,000,000
GBP
|
41,250,000,000
GBP
|
21,180,000,000
GBP
|
| Mandatory reserve deposits at central banks |
918,000,000
GBP
|
854,000,000
GBP
|
707,000,000
GBP
|
| Bank balances at central banks other than mandatory reserve deposits |
47,221,000,000
GBP
|
40,396,000,000
GBP
|
20,473,000,000
GBP
|
| Reverse repurchase agreements and cash collateral on securities borrowed |
12,683,000,000
GBP
|
19,599,000,000
GBP
|
— |
| Other assets |
1,577,000,000
GBP
|
3,013,000,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | |||
| Net defined benefit liability |
37,000,000
GBP
|
403,000,000
GBP
|
— |
| Derivative financial liabilities |
777,000,000
GBP
|
1,584,000,000
GBP
|
— |
| Deposit liabilities | — | — | — |
| Deposits from banks |
33,855,000,000
GBP
|
20,958,000,000
GBP
|
— |
| Deposits from customers [abstract] | |||
| Deposits from customers |
192,926,000,000
GBP
|
195,135,000,000
GBP
|
— |
| Subordinated liabilities [abstract] | |||
| Subordinated liabilities |
2,228,000,000
GBP
|
2,556,000,000
GBP
|
— |
| Debt instruments issued |
25,520,000,000
GBP
|
35,566,000,000
GBP
|
— |
| Repurchase agreements and cash collateral on securities lent |
11,718,000,000
GBP
|
15,848,000,000
GBP
|
— |
| Other liabilities |
2,189,000,000
GBP
|
2,337,000,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
3,105,000,000
GBP
|
3,105,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
5,053,000,000
GBP
|
4,348,000,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
287,098,000,000
GBP
|
292,332,000,000
GBP
|
— |
| Liabilities |
270,996,000,000
GBP
|
276,396,000,000
GBP
|
— |
| Assets less current liabilities [abstract] |