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Share-based payments - Additional Information (Detail) £ in Millions	12 Months Ended
	Dec. 31, 2019 GBP (£) Employees	Dec. 31, 2018 GBP (£)	Dec. 31, 2017 GBP (£)
Restricted stock plans [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Unrecognised compensation cost	£ 140.7	£ 146.0
Fair value of shares vested	£ 90.8	£ 107.2	£ 114.8
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%
Percentage of total Shareholder Return on vesting period	15.00%
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%
Percentage of total Shareholder Return on vesting period	100.00%
Executive Performance Share Plan [member] | Weighted average [member]
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Average return on equity percentage	7.50%
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 participating in restricted stock plans | Employees	1,500

X

- 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

Average return on equity percentage.

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- Definition

Performance share unit, vesting period.

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- Definition

Compound annual growth percentage.

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- Definition

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

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- Definition

Number of key executives participating in restricted stock plans.

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- Definition

Percentage Of Return Of Equity

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X

- Definition

Percentage of total Shareholder Return on vesting period.

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- Definition

Share-based Payments Vesting Period

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- Definition

Threshold performance vesting percentage.

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- Definition

Unrecognized share-based payments compensation cost.

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Unrecognized Share-based Payments Compensation Cost Recognised Period

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