Disclosure Of Analysis Of Other Comprehensive Income By Item [Text Block]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of analysis of other comprehensive income by item [text block] | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of analysis of other comprehensive income by item [abstract] | ||||||||||||
| Disclosure of analysis of other comprehensive income by item [line items] | ||||||||||||
| Other comprehensive income, net of tax, cash flow hedges |
31,000,000
GBP
|
31,000,000
GBP
|
— |
31,000,000
GBP
|
780,000,000
GBP
|
780,000,000
GBP
|
— |
780,000,000
GBP
|
1,235,000,000
GBP
|
1,235,000,000
GBP
|
1,235,000,000
GBP
|
— |
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans |
289,000,000
GBP
|
— |
289,000,000
GBP
|
289,000,000
GBP
|
431,000,000
GBP
|
— |
431,000,000
GBP
|
431,000,000
GBP
|
— |
455,000,000
GBP
|
455,000,000
GBP
|
455,000,000
GBP
|
| Other comprehensive income, net of tax, change in fair value of financial liability attributable to change in credit risk of liability |
12,000,000
GBP
|
— |
12,000,000
GBP
|
12,000,000
GBP
|
11,000,000
GBP
|
— |
11,000,000
GBP
|
11,000,000
GBP
|
— |
20,000,000
GBP
|
20,000,000
GBP
|
20,000,000
GBP
|