Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
91,000,000
GBP
|
112,000,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
372,000,000
GBP
|
413,000,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
10,000,000
GBP
|
–
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in associates reported in separate financial statements |
2,000,000
GBP
|
1,000,000
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
50,329,000,000
GBP
|
43,617,000,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
1,859,000,000
GBP
|
1,782,000,000
GBP
|
2,064,000,000
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
–
GBP
|
1,000,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Derivative financial assets |
57,000,000
GBP
|
40,000,000
GBP
|
— |
| Loans and advances | — | — | — |
| Loans and advances to customers |
38,000,000
GBP
|
34,000,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | |||
| Derivative financial liabilities |
25,000,000
GBP
|
20,000,000
GBP
|
— |
| Investment contracts liabilities |
43,396,000,000
GBP
|
38,186,000,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
115,000,000
GBP
|
115,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
958,000,000
GBP
|
989,000,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Reserve of share-based payments |
42,000,000
GBP
|
41,000,000
GBP
|
— |
| Capital redemption reserve |
346,000,000
GBP
|
346,000,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
53,345,000,000
GBP
|
46,417,000,000
GBP
|
— |
| Liabilities |
51,826,000,000
GBP
|
44,869,000,000
GBP
|
— |
| Assets less current liabilities [abstract] |