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Other disclosures - Credit Risk - Movement in gross exposure for loan commitment and financial guarantees (Details) - Gross exposure [member] - Loan commitments and financial guarantee contracts [member]
£ in Millions
6 Months Ended
Jun. 30, 2019
GBP (£)
Loan commitments and financial guarantee contracts  
Opening balance £ 265,455
Net transfers between stages 0
Business activity in the year 45,590
Net drawdowns and repayments (1,633)
Final repayments (31,509)
Ending balance 277,903
Stage 1 [member]  
Loan commitments and financial guarantee contracts  
Opening balance 248,590
Net transfers between stages (506)
Business activity in the year 44,043
Net drawdowns and repayments (2,348)
Final repayments (27,183)
Ending balance 262,596
Lifetime expected credit losses [member] | Stage 2 [member]  
Loan commitments and financial guarantee contracts  
Opening balance 16,444
Net transfers between stages 142
Business activity in the year 1,538
Net drawdowns and repayments 997
Final repayments (4,092)
Ending balance 15,029
Lifetime expected credit losses [member] | Credit Impaired - Stage 3 [member]  
Loan commitments and financial guarantee contracts  
Opening balance 421
Net transfers between stages 364
Business activity in the year 9
Net drawdowns and repayments (282)
Final repayments (234)
Ending balance £ 278