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OTHER EQUITY INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure Of Other Equity Instruments Explanatory [Abstract]  
Disclosure Of Other Equity Instruments [text block]
   2019   2018   2017 
   £m   £m   £m 
At 1 January   6,491    5,355    5,355 
Issued in the year:               
US dollar notes ($1,500 million nominal)       1,136     
US dollar notes ($500 million nominal)   396         
Sterling notes (£500 million nominal)   500         
Redemption   (1,481)        
At 31 December   5,906    6,491    5,355