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Fair value measurement - Summary of Carrying Amounts and Fair Values of Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 168 | $ 206
Equity securities available-for-sale | 127 | 156
Loans and receivables: |  |
Other financial assets | 117 | 112
Trade and other receivables, excluding prepayments | 477 | 403
Financial assets | 889 | 877
Financial liabilities |  |
Loans and other borrowings | (2,019) | (1,712)
Loyalty programme liability | (760) | (685)
Trade and other payables | (889) | (881)
Derivatives |  | (3)
Provisions | (8) | (8)
Financial Liabilities | (3,676) | (3,289)
GBP400m 3.875% bonds 2022 [member] |  |
Financial liabilities |  |
Loans and other borrowings | (538) | (489)
GBP300m 3.75% bonds 2025 [member] |  |
Financial liabilities |  |
Loans and other borrowings | (406) | (370)
GBP350m 2.125% bonds 2026 [member] |  |
Financial liabilities |  |
Loans and other borrowings | (472) | (430)
Finance lease obligations [member] |  |
Financial liabilities |  |
Loans and other borrowings | (231) | (227)
Unsecured bank loans [member] |  |
Financial liabilities |  |
Loans and other borrowings | (262) | (107)
Bank overdrafts [member] |  |
Financial liabilities |  |
Loans and other borrowings | (110) | (89)
Fair value [member] |  |
Financial assets |  |
Cash and cash equivalents | 168 | 206
Equity securities available-for-sale | 127 | 156
Loans and receivables: |  |
Other financial assets | 117 | 112
Trade and other receivables, excluding prepayments | 477 | 403
Financial assets | 889 | 877
Financial liabilities |  |
Loyalty programme liability | (760) | (685)
Trade and other payables | (889) | (881)
Derivatives |  | (3)
Provisions | (8) | (8)
Financial Liabilities | (3,835) | (3,430)
Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Financial liabilities |  |
Loans and other borrowings | (593) | (541)
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Financial liabilities |  |
Loans and other borrowings | (441) | (408)
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Financial liabilities |  |
Loans and other borrowings | (454) | (411)
Fair value [member] | Finance lease obligations [member] |  |
Financial liabilities |  |
Loans and other borrowings | (318) | (297)
Fair value [member] | Unsecured bank loans [member] |  |
Financial liabilities |  |
Loans and other borrowings | (262) | (107)
Fair value [member] | Bank overdrafts [member] |  |
Financial liabilities |  |
Loans and other borrowings | $ (110) | $ (89)

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