FINANCIAL RISK MANAGEMENT - Schedule of Debt Securities Held at Amortised Cost (Details) - GBP (£) £ in Millions	Dec. 31, 2021	Dec. 31, 2020
Asset-backed securities:
Debt securities	£ 6,835	£ 5,405
Loans and receivables, category
Asset-backed securities:
Asset-backed securities	3,065	3,659
Corporate and other debt securities	3,773	1,749
Debt securities	6,835	5,405
Investment grade \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	3,047	3,639
Corporate and other debt securities	3,760	1,721
Other \| Sub-investment grade
Asset-backed securities:
Debt securities	18	8
Other \| Not rated
Asset-backed securities:
Debt securities	13	40
Other \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	18	20
Corporate and other debt securities	13	28
Mortgage-backed securities \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	1,457	2,046
Mortgage-backed securities \| Investment grade \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	1,457	2,046
Mortgage-backed securities \| Other \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	0	0
Other asset-backed securities \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	1,608	1,613
Other asset-backed securities \| Investment grade \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	1,590	1,593
Other asset-backed securities \| Other \| Loans and receivables, category
Asset-backed securities:
Asset-backed securities	18	20
Corporate and other debt securities \| Loans and receivables, category
Asset-backed securities:
Gross exposure	6,838	5,408
Allowance for impairment losses	(3)	(3)
Corporate and other debt securities \| Investment grade \| Loans and receivables, category
Asset-backed securities:
Gross exposure	6,807	5,360
Corporate and other debt securities \| Other \| Loans and receivables, category
Asset-backed securities:
Gross exposure	£ 31	£ 48

The amount of debt instruments held that are backed by underlying assets. [Refer: Debt instruments held]

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The amount of debt instruments held by the entity that were issued by a corporate entity. [Refer: Debt instruments held]

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The amount of exposure to loss resulting from credit risk. [Refer: Credit risk [member]]

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The amount of instruments representing indebtedness held by the entity.

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Allowance for impairment losses

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