Critical accounting judgements and estimates - Narrative (Details) - GBP (£) £ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Disclosure of changes in accounting estimates [line items]
Allowance account for credit losses of financial assets	£ 5,058	£ 6,247
Upside
Disclosure of changes in accounting estimates [line items]
Weightage	30.00%	30.00%
Downside
Disclosure of changes in accounting estimates [line items]
Weightage	30.00%	30.00%
Base case
Disclosure of changes in accounting estimates [line items]
Weightage	30.00%	30.00%
Severe downside
Disclosure of changes in accounting estimates [line items]
Weightage	10.00%	10.00%
Probability weighted relative to base case
Disclosure of changes in accounting estimates [line items]
Increase in credit loss	£ 388	£ 506
Management adjustments
Disclosure of changes in accounting estimates [line items]
Increase in credit loss	1,682	1,383
Impairment (credit) charge on drawn balances
Disclosure of changes in accounting estimates [line items]
Allowance account for credit losses of financial assets	£ 4,699	£ 5,788

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2020-01-01

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The increase (decrease) in the allowance account used to record the impairment of financial assets due to credit losses. [Refer: Financial assets; Allowance account for credit losses of financial assets]

+ References

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- Definition

The weightage of probability of default.

+ References

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