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Financial Instruments: classification - Assets (Details) - GBP (£)
£ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Financial Instruments      
Assets £ 748,336 £ 738,111 £ 738,056
Financial Assets 748,336   738,056
Cash and balances at central banks      
Financial Instruments      
Financial Assets 102,590   98,337
Loans and advances to banks - reverse repos      
Financial Instruments      
Financial Assets 9,739   13,997
Loans and advances to banks - other      
Financial Instruments      
Financial Assets 18,100   16,254
Loans and advances to customers - reverse repos      
Financial Instruments      
Financial Assets 29,177   26,735
Loans and advances to customers - other      
Financial Instruments      
Financial Assets 319,961   323,184
Debt securities      
Financial Instruments      
Financial Assets 92,269   78,933
Equity shares      
Financial Instruments      
Financial Assets 581   450
Settlement balances      
Financial Instruments      
Financial Assets 8,325   2,517
Derivatives      
Financial Instruments      
Financial Assets 151,136   160,843
Other assets      
Financial Instruments      
Assets 16,458   16,806
Financial Assets and Liabilities, Category      
Financial Instruments      
Assets     4,128
Other assets      
Financial Instruments      
Assets 16,458   16,806
Other assets | Other assets      
Financial Instruments      
Assets 16,458   16,806
Held-for-trading | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets     246,834
Held-for-trading | Financial Assets and Liabilities, Category | Loans and advances to banks - reverse repos      
Financial Instruments      
Financial Assets     11,845
Held-for-trading | Financial Assets and Liabilities, Category | Loans and advances to banks - other      
Financial Instruments      
Financial Assets     6,889
Held-for-trading | Financial Assets and Liabilities, Category | Loans and advances to customers - reverse repos      
Financial Instruments      
Financial Assets     24,427
Held-for-trading | Financial Assets and Liabilities, Category | Loans and advances to customers - other      
Financial Instruments      
Financial Assets     15,320
Held-for-trading | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets     27,481
Held-for-trading | Financial Assets and Liabilities, Category | Equity shares      
Financial Instruments      
Financial Assets     29
Held-for-trading | Financial Assets and Liabilities, Category | Derivatives      
Financial Instruments      
Financial Assets     160,843
MFVPL | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets 251,756    
MFVPL | Financial Assets and Liabilities, Category | Loans and advances to banks - reverse repos      
Financial Instruments      
Financial Assets 9,192    
MFVPL | Financial Assets and Liabilities, Category | Loans and advances to banks - other      
Financial Instruments      
Financial Assets 8,003    
MFVPL | Financial Assets and Liabilities, Category | Loans and advances to customers - reverse repos      
Financial Instruments      
Financial Assets 29,167    
MFVPL | Financial Assets and Liabilities, Category | Loans and advances to customers - other      
Financial Instruments      
Financial Assets 15,825    
MFVPL | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets 38,339    
MFVPL | Financial Assets and Liabilities, Category | Equity shares      
Financial Instruments      
Financial Assets 94    
MFVPL | Financial Assets and Liabilities, Category | Derivatives      
Financial Instruments      
Financial Assets 151,136    
DFV | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets     190
DFV | Financial Assets and Liabilities, Category | Loans and advances to customers - other      
Financial Instruments      
Financial Assets     56
DFV | Financial Assets and Liabilities, Category | Equity shares      
Financial Instruments      
Financial Assets     134
FVOCI | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets 46,069    
FVOCI | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets 45,582    
FVOCI | Financial Assets and Liabilities, Category | Equity shares      
Financial Instruments      
Financial Assets 487    
AFS | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets     43,968
AFS | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets     43,681
AFS | Financial Assets and Liabilities, Category | Equity shares      
Financial Instruments      
Financial Assets     287
Amortised cost | Financial Assets and Liabilities, Category      
Financial Instruments      
Assets 434,053    
Amortised cost | Financial Assets and Liabilities, Category | Cash and balances at central banks      
Financial Instruments      
Financial Assets 102,590    
Amortised cost | Financial Assets and Liabilities, Category | Loans and advances to banks - reverse repos      
Financial Instruments      
Financial Assets 547    
Amortised cost | Financial Assets and Liabilities, Category | Loans and advances to banks - other      
Financial Instruments      
Financial Assets 10,097    
Amortised cost | Financial Assets and Liabilities, Category | Loans and advances to customers - reverse repos      
Financial Instruments      
Financial Assets 10    
Amortised cost | Financial Assets and Liabilities, Category | Loans and advances to customers - other      
Financial Instruments      
Financial Assets 304,136    
Amortised cost | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets 8,348    
Amortised cost | Financial Assets and Liabilities, Category | Settlement balances      
Financial Instruments      
Financial Assets 8,325    
Loans and receivables | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets     426,130
Loans and receivables | Financial Assets and Liabilities, Category | Cash and balances at central banks      
Financial Instruments      
Financial Assets     98,337
Loans and receivables | Financial Assets and Liabilities, Category | Loans and advances to banks - reverse repos      
Financial Instruments      
Financial Assets     2,152
Loans and receivables | Financial Assets and Liabilities, Category | Loans and advances to banks - other      
Financial Instruments      
Financial Assets     9,365
Loans and receivables | Financial Assets and Liabilities, Category | Loans and advances to customers - reverse repos      
Financial Instruments      
Financial Assets     2,308
Loans and receivables | Financial Assets and Liabilities, Category | Loans and advances to customers - other      
Financial Instruments      
Financial Assets     307,808
Loans and receivables | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets     3,643
Loans and receivables | Financial Assets and Liabilities, Category | Settlement balances      
Financial Instruments      
Financial Assets     2,517
Held-to-maturity | Financial Assets and Liabilities, Category | Debt securities      
Financial Instruments      
Financial Assets     4,128
Hedging derivatives | Financial Assets and Liabilities, Category      
Financial Instruments      
Financial Assets £ 2,502   £ 2,967