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Fair value of financial instruments - Comparison of carrying amounts and fair values for assets and liabilities not held at fair value (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial assets      
Loans and advances at amortised cost £ 182,507 £ 145,259  
Reverse repurchase agreements and other similar secured lending 725 3,177  
Financial liabilities      
Repurchase agreements and other similar secured borrowing (11,965) (12,769)  
Debt securities in issue (60,012) (48,388)  
Subordinated liabilities (38,253) (32,185) £ (32,005)
Not held at fair value      
Financial assets      
Loans and advances at amortised cost 181,727 145,665  
Reverse repurchase agreements and other similar secured lending 725 3,177  
Financial liabilities      
Deposits at amortised cost (291,552) (262,843)  
Repurchase agreements and other similar secured borrowing (11,966) (12,776)  
Debt securities in issue (59,895) (48,350)  
Subordinated liabilities (38,686) (33,598)  
Not held at fair value | Level 1      
Financial assets      
Loans and advances at amortised cost 14,210 15,406  
Reverse repurchase agreements and other similar secured lending 0 0  
Financial liabilities      
Deposits at amortised cost (176,959) (180,829)  
Repurchase agreements and other similar secured borrowing 0 0  
Debt securities in issue 0 0  
Subordinated liabilities 0 0  
Not held at fair value | Level 2      
Financial assets      
Loans and advances at amortised cost 86,559 63,948  
Reverse repurchase agreements and other similar secured lending 725 3,177  
Financial liabilities      
Deposits at amortised cost (114,267) (82,014)  
Repurchase agreements and other similar secured borrowing (11,966) (12,776)  
Debt securities in issue (57,954) (46,201)  
Subordinated liabilities (38,465) (33,598)  
Not held at fair value | Level 3      
Financial assets      
Loans and advances at amortised cost 80,958 66,311  
Reverse repurchase agreements and other similar secured lending 0 0  
Financial liabilities      
Deposits at amortised cost (326) 0  
Repurchase agreements and other similar secured borrowing 0 0  
Debt securities in issue (1,941) (2,149)  
Subordinated liabilities (220) 0  
Carrying amount      
Financial assets      
Loans and advances at amortised cost 182,507 145,259  
Reverse repurchase agreements and other similar secured lending 725 3,177  
Financial liabilities      
Deposits at amortised cost (291,579) (262,828)  
Repurchase agreements and other similar secured borrowing (11,965) (12,769)  
Debt securities in issue (60,012) (48,388)  
Subordinated liabilities £ (38,253) £ (32,185)