Disclosure Of Employee Benefits [Text Block]
| Concept |
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 |
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 employee benefits [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of information about defined benefit plans [abstract] | ||||||||||
| Disclosure of defined benefit plans [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of defined benefit plans [abstract] | ||||||||||
| Disclosure of defined benefit plans [line items] | ||||||||||
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans [abstract] | ||||||||||
| 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, before tax, gains (losses) on remeasurements of defined benefit plans [abstract] | ||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans |
598,000,000
GBP
|
— | — | — |
722,000,000
GBP
|
— | — | — |
1,264,000,000
GBP
|
— |