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Financial Risk Management Objectives and Policies - Maturity Profile of Financial Assets and Liabilities Based on Contractual Undiscounted Payments (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Financial assets |  |  |
Trade and bills receivables | ¥ 12,150 | $ 1,920 | ¥ 0
Cash and bank balances | 6,029,207 | 952,572 | 4,052,957
Financial assets | 13,218,760 | 2,088,471 | 11,370,669
Financial liabilities |  |  |
Derivative not designated as hedges - foreign exchange forward contract |  |  | 140
Trade and other payables (Note 28) | 7,624,496 | 1,204,616 | 6,981,815
Other liabilities | 79 | 12 | 248
Financial liabilities | 9,060,142 | 1,431,438 | 7,581,144
Liquidity risk [Member] |  |  |
Financial assets |  |  |
Trade and bills receivables | 7,075,319 | 1,117,850 | 7,111,890
Other receivables, excluding tax recoverable | 133,295 | 21,060 | 248,275
Cash and bank balances | 6,029,207 | 952,572 | 4,052,957
Held for trading investment | 24,714 | 3,905 | 12,181
Financial assets | 13,262,535 | 2,095,387 | 11,425,303
Financial liabilities |  |  |
Derivative not designated as hedges - foreign exchange forward contract |  |  | 140
Interest-bearing loans and borrowings | 1,652,413 | 261,069 | 928,233
Trade and other payables (Note 28) | 7,485,109 | 1,182,594 | 6,713,240
Other liabilities | 79 | 12 | 113
Financial liabilities | 9,137,601 | $ 1,443,675 | 7,641,726
Liquidity risk [Member] | One Year or Less [Member] |  |  |
Financial assets |  |  |
Trade and bills receivables | 7,075,319 |  | 7,111,890
Other receivables, excluding tax recoverable | 132,675 |  | 246,687
Cash and bank balances | 6,029,207 |  | 4,052,957
Held for trading investment | 24,714 |  | 12,181
Financial assets | 13,261,915 |  | 11,423,715
Financial liabilities |  |  |
Derivative not designated as hedges - foreign exchange forward contract |  |  | 140
Interest-bearing loans and borrowings | 1,624,539 |  | 909,824
Trade and other payables (Note 28) | 7,328,762 |  | 6,576,468
Other liabilities | 33 |  | 43
Financial liabilities | 8,953,334 |  | 7,486,475
Liquidity risk [Member] | Two to Five Years [Member] |  |  |
Financial assets |  |  |
Other receivables, excluding tax recoverable | 620 |  | 1,588
Financial assets | 620 |  | 1,588
Financial liabilities |  |  |
Interest-bearing loans and borrowings | 27,874 |  | 18,409
Trade and other payables (Note 28) | 156,347 |  | 136,772
Other liabilities | 46 |  | 70
Financial liabilities | ¥ 184,267 |  | ¥ 155,251

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