Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
1,714,000,000
GBP
|
1,815,000,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
14,385,000,000
GBP
|
15,422,000,000
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
284,000,000
GBP
|
287,000,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
4,838,000,000
GBP
|
5,148,000,000
GBP
|
4,739,000,000
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 |
1,466,000,000
GBP
|
1,356,000,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Net defined benefit asset |
45,000,000
GBP
|
19,000,000
GBP
|
— |
| Derivative financial assets |
1,085,000,000
GBP
|
1,693,000,000
GBP
|
— |
| Equity instruments held |
64,890,000,000
GBP
|
66,248,000,000
GBP
|
— |
| Debt instruments held [abstract] | |||
| Debt instruments held |
69,775,000,000
GBP
|
70,683,000,000
GBP
|
— |
| Miscellaneous liabilities [abstract] | |||
| Net defined benefit liability |
258,000,000
GBP
|
294,000,000
GBP
|
— |
| Derivative financial liabilities |
3,202,000,000
GBP
|
2,910,000,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
120,000,000
GBP
|
119,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
14,435,000,000
GBP
|
15,223,000,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
184,224,000,000
GBP
|
189,180,000,000
GBP
|
— |
| Liabilities |
180,901,000,000
GBP
|
185,096,000,000
GBP
|
— |
| Assets less current liabilities [abstract] |