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PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance £ 12,300    
Ending Balance 13,104 £ 12,300  
Expenditure on investment properties (see below) 73 143  
Change in fair value of investment properties (note 7) 108 (139) £ (230)
Investment property [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 3,770    
Ending Balance 3,553 3,770  
Buildings [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 1,000    
Ending Balance 979 1,000  
Other property, plant and equipment [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 2,709    
Ending Balance 2,464 2,709  
Property, plant and equipment subject to operating leases [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 4,821    
Ending Balance 4,439 4,821  
Right-of-use assets [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance [1]    
Ending Balance [1] 1,669  
Gross carrying amount [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 18,463    
Ending Balance 18,578 18,463  
Exchange and other adjustments 20    
Additions 2,532    
Expenditure on investment properties (see below) 73    
Change in fair value of investment properties (note 7) (108)    
Disposals (2,402)    
Gross carrying amount [member] | Previously stated [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 16,747 17,086  
Ending Balance   16,747 17,086
Exchange and other adjustments   5  
Additions   2,346  
Expenditure on investment properties (see below)   143  
Change in fair value of investment properties (note 7)   139  
Disposals   (2,972)  
Gross carrying amount [member] | Increase (decrease) due to changes in accounting policy [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Adjustment on adoption of IFRS 16 (note 55)   1,716  
Gross carrying amount [member] | Investment property [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 3,770    
Ending Balance 3,553 3,770  
Exchange and other adjustments 16    
Expenditure on investment properties (see below) 73    
Change in fair value of investment properties (note 7) (108)    
Disposals (198)    
Gross carrying amount [member] | Investment property [member] | Previously stated [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 3,770 3,699  
Ending Balance   3,770 3,699
Expenditure on investment properties (see below)   143  
Change in fair value of investment properties (note 7)   139  
Disposals   (211)  
Gross carrying amount [member] | Buildings [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 1,216    
Ending Balance 1,095 1,216  
Exchange and other adjustments 3    
Additions 121    
Disposals (245)    
Gross carrying amount [member] | Buildings [member] | Previously stated [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 1,216 1,791  
Ending Balance   1,216 1,791
Additions   72  
Disposals   (647)  
Gross carrying amount [member] | Other property, plant and equipment [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 5,007    
Ending Balance 5,296 5,007  
Exchange and other adjustments 5    
Additions 522    
Disposals (238)    
Gross carrying amount [member] | Other property, plant and equipment [member] | Previously stated [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 5,007 5,068  
Ending Balance   5,007 5,068
Exchange and other adjustments   (6)  
Additions   519  
Disposals   (574)  
Gross carrying amount [member] | Property, plant and equipment subject to operating leases [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 6,754    
Ending Balance 6,749 6,754  
Exchange and other adjustments (4)    
Additions 1,693    
Disposals (1,694)    
Gross carrying amount [member] | Property, plant and equipment subject to operating leases [member] | Previously stated [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 6,754 6,528  
Ending Balance   6,754 6,528
Exchange and other adjustments   11  
Additions   1,755  
Disposals   (1,540)  
Gross carrying amount [member] | Right-of-use assets [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance [1] 1,716    
Ending Balance [1] 1,885 1,716  
Exchange and other adjustments [1]    
Additions [1] 196    
Expenditure on investment properties (see below) [1]    
Change in fair value of investment properties (note 7) [1]    
Disposals [1] (27)    
Gross carrying amount [member] | Right-of-use assets [member] | Increase (decrease) due to changes in accounting policy [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Adjustment on adoption of IFRS 16 (note 55) [1]   1,716  
Accumulated depreciation, amortisation and impairment [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 4,447 4,359  
Ending Balance 5,474 4,447 4,359
Exchange and other adjustments (36) (1)  
Depreciation charge for the year 2,064 1,852  
Disposals (1,001) (1,763)  
Accumulated depreciation, amortisation and impairment [member] | Buildings [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 216 728  
Ending Balance 116 216 728
Exchange and other adjustments   1  
Depreciation charge for the year 125 121  
Disposals (225) (634)  
Accumulated depreciation, amortisation and impairment [member] | Other property, plant and equipment [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 2,298 2,125  
Ending Balance 2,832 2,298 2,125
Exchange and other adjustments (1) (8)  
Depreciation charge for the year 715 715  
Disposals (180) (534)  
Accumulated depreciation, amortisation and impairment [member] | Property, plant and equipment subject to operating leases [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Beginning Balance 1,933 1,506  
Ending Balance 2,310 1,933 £ 1,506
Exchange and other adjustments (36) 6  
Depreciation charge for the year 1,008 1,016  
Disposals (595) £ (595)  
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Ending Balance [1] 216    
Exchange and other adjustments [1] 1    
Depreciation charge for the year [1] 216    
Disposals [1] £ (1)    
[1] Primarily premises.