Investments in Joint Ventures and Associates - Summary of Financial Statements (Detail) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments in subsidiaries, joint ventures and associates [abstract]
Associates	£ 7	£ 392
Joint ventures	0
Associates classified as held for sale	397
Total	404	392
Associates	54	43
Joint ventures		1
Total	£ 54	£ 44	£ 78

The amount of investments in associates in an entity's separate financial statements. [Refer: Associates [member]]

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The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

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The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

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The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Profit (loss)]

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The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The entity's share of the profit (loss) of joint ventures accounted for using the equity method. [Refer: Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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Associates classified as held for sale.

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