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Financial risk management and derivatives - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 EUR (€)
Disclosure of financial risk management [line items] |  |  |
Currency swaps deposits maturity period | 8 years 6 months |  |
Currency swaps [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Exchange rate Dollars to Euro | 1.15 |  | 1.15
Gain (loss) relating to exchange movements | $ 15 |  |
Gain (loss) relating to other fair value movements | $ (8) |  |
EUR500m 2.125% bonds 2027 [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Swaps held by Group | € |  |  | € 500,000,000
Currency swaps transaction percentage | 2.125% |  | 2.125%
Change in value of hedged item used as basis for recognising hedge ineffectiveness | $ 9 |  |
Currency risk [member] | Net investment hedges [member] | Forward contract [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Currency swaps borrowings | 100,000,000 | 30,000,000 | 100,000,000
Swaps held by Group | $ 100 | $ 160 |
Currency risk [member] | Sterling [member] | Cash flow hedges [member] | Currency swaps [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Currency swaps borrowings | 436,000,000 |  | 436,000,000
Currency risk [member] | Euros [member] | Cash flow hedges [member] | Currency swaps [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Currency swaps borrowings | 500,000,000 |  | 500,000,000
Interest rate risk [member] | Fixed interest rate [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Description of fixed Interest rate borrowings | Group’s policy requires a minimum of 50% fixed rate debt over the next 12 months |  |
Fixed Interest rate borrowings | 100.00% | 86.00% | 100.00%
Liquidity risk [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Funds held in foreign countries where repatriation is restricted | $ 2 | $ 3 |
Number of financial covenants | Two |  |
Capital risk management [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Amounts managed as capital | 445 | 543 |

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