Business Combinations - Schedule of Cash Flow on Acquisitions (Detail) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about business combination [line items]
Net cash outflow	£ (45)	£ (5)	£ (11)
Goodwill	2,139	2,111
Business combinations [member]
Disclosure of detailed information about business combination [line items]
Cash - current year acquisitions	(40)
Deferred payments for prior year acquisitions and other items	(5)	(5)	(11)
Net cash outflow	(45)	£ (5)	£ (11)
Intangible assets	23
Net assets acquired at fair value	22
Goodwill	18
Trade And Other Receivables	1
Trade And Other Liabilities	(2)
Total	40
Cash transferred	40
Total consideration	£ 40

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

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The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [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 portion of consideration paid or received, consisting of cash and cash equivalents, in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]; Cash and cash equivalents; Consideration paid (received)]

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