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Share-based payments - Additional Information (Detail) £ in Millions	12 Months Ended
	Dec. 31, 2018 GBP (£) Employees	Dec. 31, 2017 GBP (£) Employees	Dec. 31, 2016 GBP (£) Employees
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Number of key executives covered | Employees	134,281	134,413	134,341
Restricted stock plans [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Unrecognised compensation cost	£ 146.0	£ 156.0
Fair value of shares vested	£ 107.2	£ 114.8	£ 116.8
Restricted stock plans [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Unrecognised compensation cost, recognised period	1 year
Restricted stock plans [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Unrecognised compensation cost, recognised period	2 years
Executive Performance Share Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Performance period	5 years
Executive Performance Share Plan [member] | Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Threshold performance vesting percentage	20.00%
Compound annual growth percentage	7.00%
Average return on equity percentage	10.00%
Compound annual growth percentage	14.00%
Executive Performance Share Plan [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Threshold performance vesting percentage	100.00%
Compound annual growth percentage	14.00%
Average return on equity percentage	14.00%
Compound annual growth percentage	18.00%
Performance Share Awards [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Vesting period	2 years
Leaders, Partners and High Potential Group [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Vesting period	3 years
Number of key executives covered	1,800

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The number of personnel employed by the entity at a date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2018-03-16

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Average return on equity percentage.

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- Definition

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Compound annual growth percentage.

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Fair value of shares vested under share-based compensation plans.

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Percentage Of Return Of Equity

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Share-based Payments Vesting Period

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Threshold performance vesting percentage.

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Unrecognized share-based payments compensation cost.

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