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Derivatives - fair value of the hedging derivative (Details) - GBP (£)
£ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair value of the hedging derivative    
Derivative financial assets £ 160,843 £ 246,981
Derivative financial liabilities 154,506 236,475
Fair value hedging    
Fair value of the hedging derivative    
Derivative financial assets 160,843 246,981
Derivative financial liabilities 154,506 236,475
Derivatives    
Fair value of the hedging derivative    
Derivative financial assets 2,967 4,789
Derivative financial liabilities 3,571 4,057
Exchange rate contracts | Spot, forwards and futures | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 1,900,000 2,271,000
Derivative financial assets 19,283 35,817
Derivative financial liabilities 19,172 33,986
Exchange rate contracts | Currency swaps | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 666,000 821,000
Derivative financial assets 11,163 22,139
Derivative financial liabilities 13,534 25,053
Exchange rate contracts | Options purchased | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 419,000 670,000
Derivative financial assets 8,765 17,486
Exchange rate contracts | Options written | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 440,000 683,000
Derivative financial liabilities 8,975 18,109
Exchange rate contracts | Derivatives | Cash flow hedging    
Fair value of the hedging derivative    
Derivative financial assets 63 259
Derivative financial liabilities 37  
Exchange rate contracts | Derivatives | Net investment hedging    
Fair value of the hedging derivative    
Derivative financial assets 11 86
Derivative financial liabilities 28 26
Interest rate contracts | Options purchased | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 1,162,000 1,518,000
Derivative financial assets 21,733 31,457
Interest rate contracts | Options written | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 1,032,000 1,181,000
Derivative financial liabilities 21,021 31,298
Interest rate contracts | Interest rate swaps | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 8,058,000 11,523,000
Derivative financial assets 99,065 139,004
Derivative financial liabilities 91,025 127,151
Interest rate contracts | Futures and forwards | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 1,764,000 2,403,000
Derivative financial assets 147 63
Derivative financial liabilities 114 36
Interest rate contracts | Derivatives | Fair value hedging    
Fair value of the hedging derivative    
Derivative financial assets 904 1,365
Derivative financial liabilities 2,211 2,612
Interest rate contracts | Derivatives | Cash flow hedging    
Fair value of the hedging derivative    
Derivative financial assets 1,989 3,079
Derivative financial liabilities 1,295 1,419
Credit derivatives | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 38,000 42,000
Derivative financial assets 531 682
Derivative financial liabilities 558 557
Equity and commodity contracts | Fair value hedging    
Fair value of the hedging derivative    
Notional amount 3,000 21,000
Derivative financial assets 156 333
Derivative financial liabilities £ 107 £ 285