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Fair value measurement - Summary of Fair Value Measurement Hierarchy of Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Equity securities available-for-sale: |  |
Equity securities available-for-sale | $ 127 | $ 156
Liabilities |  |
Loans and other borrowings | (2,019) | (1,712)
Derivatives |  | (3)
GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (538) | (489)
GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (406) | (370)
GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (472) | (430)
Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | (231) | (227)
Fair value [member] |  |
Equity securities available-for-sale: |  |
Equity securities available-for-sale | 127 | 156
Liabilities |  |
Derivatives |  | (3)
Fair value [member] | Quoted equity shares [member] |  |
Equity securities available-for-sale: |  |
Equity securities available-for-sale | 10 | 14
Fair value [member] | Unquoted equity shares [member] |  |
Equity securities available-for-sale: |  |
Equity securities available-for-sale | 117 | 142
Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (593) | (541)
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (441) | (408)
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (454) | (411)
Fair value [member] | Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | (318) | (297)
Level 1 [member] | Fair value [member] | Quoted equity shares [member] |  |
Equity securities available-for-sale: |  |
Equity securities available-for-sale | 10 | 14
Level 1 [member] | Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (593) | (541)
Level 1 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (441) | (408)
Level 1 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (454) | (411)
Level 2 [member] | Fair value [member] |  |
Liabilities |  |
Derivatives |  | (3)
Level 2 [member] | Fair value [member] | Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | (318) | (297)
Level 3 [member] | Fair value [member] | Unquoted equity shares [member] |  |
Equity securities available-for-sale: |  |
Equity securities available-for-sale | $ 117 | $ 142

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