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Loans and Other Borrowings - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Options | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |
Facilities provided by banks | $ 1,403 | $ 1,420
Syndicated facility [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Facilities provided by banks | $ 1,275 |
Maturity date | March 2022 |
Bilateral Facility [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | March 2022 |
Facilities provided by banks | $ 75 |
Finance lease obligations [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Length of extension term (years) | 20 years |
Number of extension options | Options | 2 |
Interest rate | 9.70% |
GBP400m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 28 November 2022 |
Interest rate | 3.875% |
Bond initial price percentage of face value | 98.787% |
Issued date | Nov. 28, 2012 |
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 14 August 2025 |
Interest rate | 3.75% |
Bond initial price percentage of face value | 99.014% |
Issued date | Aug. 14, 2015 |
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 24 August 2026 |
Interest rate | 2.125% |
Bond initial price percentage of face value | 99.45% |
Issued date | Aug. 24, 2016 |
EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 15 May 2027 |
Interest rate | 2.125% |
Bond initial price percentage of face value | 99.53% |
Issued date | Nov. 15, 2018 |

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