Business Combinations - Schedule of Fair Values for Assets and Liabilities Arising from Acquisitions (Detail) - GBP (£) £ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [line items]
Goodwill	£ 2,030	£ 2,341
Business combinations [member]
Disclosure of detailed information about business combination [line items]
Intangible assets		10
Net assets acquired at fair value		10
Goodwill		3
Total		13
Cash		(7)
Other liabilities		(6)
Total consideration		£ (13)

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

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The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]]

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]]

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The amount recognised as of the acquisition date for identifiable intangible assets acquired in a business combination. [Refer: Intangible assets other than goodwill; Business combinations [member]]

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The fair value, at acquisition date, of liabilities incurred (for example, a liability for contingent consideration) as consideration transferred in a business combination. [Refer: Business combinations [member]]

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