Financial Instruments: Assets at Amortised Cost (Details) - GBP (£) £ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair value of assets
Carrying value, Financial assets	£ 748,336	£ 738,056
Loans and advances to banks \| Carrying value
Fair value of assets
Carrying value, Financial assets	9,500	10,500
Loans and advances to banks \| At fair value
Fair value of assets
Fair value, Financial assets	9,500	10,500
Loans and advances to customers \| Carrying value
Fair value of assets
Carrying value, Financial assets	304,100	310,100
Loans and advances to customers \| At fair value
Fair value of assets
Fair value, Financial assets	299,400	306,800
Debt securities
Fair value of assets
Carrying value, Financial assets	92,269	78,933
Debt securities \| Carrying value
Fair value of assets
Carrying value, Financial assets	8,300	7,800
Debt securities \| At fair value
Fair value of assets
Fair value, Financial assets	£ 8,500	£ 7,900

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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