Allowance for impairment losses - Income statement charges (Details) - GBP (£) £ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Allowance for impairment losses.
Charge to the income statement	£ 579	£ 937
Drawn balance
Allowance for impairment losses.
Charge to the income statement	599	1,024
Expected credit loss	361
Undrawn balance
Allowance for impairment losses.
Charge to the income statement	(19)	(73)
Expected credit loss	10
Financial assets at fair value through other comprehensive income
Allowance for impairment losses.
Charge to the income statement	(1)	£ (14)
Purchased Or Originated Credit Impairment [Member] \| Drawn balance
Allowance for impairment losses.
Charge to the income statement	£ (120)

The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b
-URIDate 2018-03-16

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- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the reversal of impairment. [Refer: Allowance account for credit losses of financial assets]

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- Definition

The amount of additional allowance for credit losses of financial assets expected to recognised in profit or loss.

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