RETIREMENT BENEFIT OBLIGATIONS - Schedule of Movement in Retirement Benefit Net Amounts Recognized in Balance Sheet (Details) - Amounts recognised in the balance sheet - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Net amount recognised in the balance sheet
At 1 January	£ 1,469
At 31 December	4,301	£ 1,469
Defined benefit pension schemes
Net amount recognised in the balance sheet
At 1 January	1,578	550
Net defined benefit pension charge	(234)	(244)
Actuarial gains (losses) on defined benefit obligation	1,267	(5,443)
Return on plan assets	449	5,565
Employer contributions	1,344	1,149
Exchange and other adjustments	0	1
At 31 December	£ 4,404	£ 1,578

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

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Defined Benefit Plan Actuarial Gain Loss

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