Financial Risk Management - Summary of Sensitivity of Carrying Value of Financial Instruments to Fluctuations in Interest Rates and Exchange Rates (Detail) - GBP (£) £ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial instruments carrying value [line items]
Financial assets	£ 1,682	£ 1,652
Cash and cash equivalents	568	645
Derivative financial instruments	9
Financial liabilities	(1,112)	(1,661)
Other borrowings	(48)
Other net financial assets	620
Total financial instruments	570
Impact of 1% increase in interest rates	14
Impact of 1% decrease in interest rates	(14)
Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	(30)
Impact of 10% weakening in exchange rates	38
Investments in unlisted securities [member]
Disclosure of financial instruments carrying value [line items]
Financial assets	93	77
Investments in unlisted securities [member] \| Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	(7)
Impact of 10% weakening in exchange rates	9
Cash and cash equivalents [member]
Disclosure of financial instruments carrying value [line items]
Financial assets	568	518
Cash and cash equivalents [member] \| Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	(36)
Impact of 10% weakening in exchange rates	45
Derivative financial instruments [member]
Disclosure of financial instruments carrying value [line items]
Financial assets	68	140
Derivative financial instruments	9
Impact of 1% increase in interest rates	(3)
Impact of 1% decrease in interest rates	3
Derivative financial instruments [member] \| Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	1
Impact of 10% weakening in exchange rates	(1)
Bonds [member]
Disclosure of financial instruments carrying value [line items]
Financial liabilities	(672)	£ (1,062)
Impact of 1% increase in interest rates	17
Impact of 1% decrease in interest rates	(17)
Bonds [member] \| Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	61
Impact of 10% weakening in exchange rates	(74)
Other borrowings [member] \| Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	2
Impact of 10% weakening in exchange rates	(3)
Other net financial assets [member] \| Sterling [member]
Disclosure of financial instruments carrying value [line items]
Impact of 10% strengthening in exchange rates	(51)
Impact of 10% weakening in exchange rates	£ 62

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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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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The amount of borrowings that the entity does not separately disclose in the same statement or note. [Refer: Borrowings]

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