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Net interest income (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net interest income      
Balances at central banks £ 99 £ 90 £ 321
Loans to banks - amortised cost 346 246 405
Loans to customers - amortised cost 8,615 8,979 9,547
Other financial assets 253 483 854
Interest receivable 9,313 9,798 [1] 11,127 [1]
Balances with banks 204 144 319
Customer deposits 556 911 1,256
Other financial liabilities 670 846 1,102
Subordinated liabilities 267 402 483
Internal funding of trading businesses 2 19 168
Interest payable 1,699 2,322 [1] 3,328 [1]
Net interest income £ 7,614 £ 7,476 [1] £ 7,799 [1]
[1] Comparative results have been re-presented from those previously published to reclassify certain items as discontinued operations as described in Note 8 to the consolidated financial statements.