Disclosure Of Analysis Of Other Comprehensive Income By Item [Text Block]
| Concept |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
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
|
— | — |
374,000,000
GBP
|
374,000,000
GBP
|
374,000,000
GBP
|
— |
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans |
431,000,000
GBP
|
— |
431,000,000
GBP
|
431,000,000
GBP
|
— |
455,000,000
GBP
|
455,000,000
GBP
|
455,000,000
GBP
|
—
GBP
|
— |
845,000,000
GBP
|
845,000,000
GBP
|
845,000,000
GBP
|
| Other comprehensive income, net of tax, change in fair value of financial liability attributable to change in credit risk of liability |
11,000,000
GBP
|
— |
11,000,000
GBP
|
11,000,000
GBP
|
— |
20,000,000
GBP
|
20,000,000
GBP
|
20,000,000
GBP
|
— | — | — |
—
GBP
|
— |