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Analysis of changes in financing during the year - Subordinated liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Analysis of changes in financing during the year      
Net cash flows from financing activities £ (2,601) £ 90 £ (2,570)
Subordinated Liabilities      
Analysis of changes in financing during the year      
At 1 January 9,962 9,979 10,535
Issue of subordinated liabilities 1,634 1,631 577
Redemption of subordinated liabilities (4,765) (3,502) (1,108)
Interest on subordinated liabilities (321) (510) (533)
Net cash flows from financing activities (3,452) (2,381) (1,064)
Effects of foreign exchange (18) (234) (315)
Changes in fair value of subordinated liabilities and MRELs (434) 133 317
Paid in equity reclassified to subordinated liabilities 1,915 1,632  
Loss on sale of subordinated liabilities and MRELs 145 324  
Interest on subordinated liabilities and MRELs 311 509 506
At 31 December 8,429 9,962 9,979
MREL      
Analysis of changes in financing during the year      
At 1 January 20,873 19,249 16,821
Issue of MRELs 3,383 1,309 3,640
Maturity/redemption of MRELs   (2) (1,285)
Interest on MRELs (647) (671) (428)
Net cash flows from financing activities 2,736 636 1,927
Effects of foreign exchange (190) (514) (683)
Changes in fair value of subordinated liabilities and MRELs (649) 829 539
Interest on subordinated liabilities and MRELs 653 673 645
At 31 December £ 23,423 £ 20,873 £ 19,249