Derivative Financial Instruments and Hedge Accounting - Additional Information (Detail) £ in Millions	12 Months Ended
Dec. 31, 2018 GBP (£)	Dec. 31, 2017 GBP (£)
Disclosure of detailed information about financial instruments [line items]
Interest rate swap contracts to fix debt amount	£ 361
Interest rate swap contracts to fix debt outstanding amount	256
Contracts to fix debt amount, net	£ 617
Outstanding contracts rate	1.39
Outstanding contracts average rate	0.79
Mark-to-market value of rate derivatives	£ 8	£ 0
Hedging gains/(losses) recognised in OCI	£ 15
Fair value hedges [member]
Disclosure of detailed information about financial instruments [line items]
Fair value hedge ratio	1.00
US Dollars [member]
Disclosure of detailed information about financial instruments [line items]
Mark-to-market value of rate derivatives	£ (185)	(869)
Sterling [member]
Disclosure of detailed information about financial instruments [line items]
Mark-to-market value of rate derivatives	(215)	12
Euro [member]
Disclosure of detailed information about financial instruments [line items]
Mark-to-market value of rate derivatives	£ 432	£ 857
Euro 2025 senior notes [member] \| Libor [member]
Disclosure of detailed information about financial instruments [line items]
Marginal interest rate on reference rate	0.81%
Euro 2021 senior notes [member] \| Libor [member]
Disclosure of detailed information about financial instruments [line items]
Marginal interest rate on reference rate	1.36%
Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings interest rate	2.20%
Bottom of range [member] \| Euro 2025 senior notes [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings interest rate	1.375%
Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings interest rate	3.80%
Top of range [member] \| Euro 2021 senior notes [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings interest rate	1.875%

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
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The interest rate on borrowings. [Refer: Borrowings]

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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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The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
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- Definition

The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2018-01-01
-Paragraph 24C
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-URIDate 2018-03-16

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- Definition

Contracts to fix debt amount, net.

+ References

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- Definition

Fair value hedge ratio.

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- Definition

Interest rate swap contracts to fix debt amount.

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- Definition

Interest rate swap contracts to fix debt outstanding amount.

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Outstanding contracts average rate.

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- Definition

Outstanding contracts rate.

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