Financial Instruments: Liabilities at Amortised Cost (Details) - GBP (£) £ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt securities in issue
Fair value of liabilities
Carrying value, Financial liabilities	£ 36,723	£ 30,559
Subordinated liabilities
Fair value of liabilities
Carrying value, Financial liabilities	10,602	12,722
Carrying value \| Deposits by banks
Fair value of liabilities
Carrying value, Financial liabilities	25,000	25,900
Carrying value \| Customer accounts
Fair value of liabilities
Carrying value, Financial liabilities	52,100	39,800
Carrying value \| Debt securities in issue
Fair value of liabilities
Carrying value, Financial liabilities	32,900	26,000
Carrying value \| Subordinated liabilities
Fair value of liabilities
Carrying value, Financial liabilities	9,700	11,800
At fair value \| Deposits by banks
Fair value of liabilities
Fair value, Financial liabilities	25,100	26,000
At fair value \| Customer accounts
Fair value of liabilities
Fair value, Financial liabilities	52,100	39,900
At fair value \| Debt securities in issue
Fair value of liabilities
Fair value, Financial liabilities	33,800	27,300
At fair value \| Subordinated liabilities
Fair value of liabilities
Fair value, Financial liabilities	£ 10,400	£ 12,600

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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