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Financial risk management and derivative financial instruments - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 EUR (€)
Disclosure of financial risk management [line items] |  |  |
Currency swaps deposits maturity period | 8 years 7 months 6 days |  |
Change in value of hedged item used as basis for recognising hedge ineffectiveness | $ (2) | $ (21) |
Exchange element of currency swaps | (15) | 15 |
Currency swaps [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Other fair value elements of currency swaps | (5) | (8) |
Exchange element of currency swaps | (15) | 15 |
Currency swaps [member] | Carrying Amounts [Member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Gain (loss) on carrying amount | $ 20 | $ 7 |
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%
Currency risk [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Average rate of hedging instrument | 3.50% |  | 3.50%
Currency risk [member] | Net investment hedges [member] | Forward contract [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Currency swaps borrowings | 100 | 100 | 100
Currency risk [member] | Cash flow hedges [member] | Currency swaps [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Change in fair value of hedging instrument used to calculate effectiveness | $ 30 | $ 9 |
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 | 94.00% | 100.00% | 94.00%
Liquidity risk [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Funds held in foreign countries where repatriation is restricted | $ 16 | $ 2 |
Number of financial covenants | two |  |
Capital risk management [member] |  |  |
Disclosure of financial risk management [line items] |  |  |
Amounts managed as capital | 1,192 | 826 |

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