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Trade and Other Receivables - Additional Information (Detail) ¥ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
Disclosure of trade and other receivables [line items] |  |  |
Trade receivables wrote off | ¥ 21.5 | $ 3.0 | ¥ 0.0
Outstanding bills receivable discounted with banks by retaining recourse obligation | 1,000.0 | 142.4 | 1,700.0
Outstanding bills receivable endorsed to suppliers with recourse obligation | ¥ 1,400.0 | $ 189.5 | ¥ 1,600.0
Top of range [member] |  |  |
Disclosure of trade and other receivables [line items] |  |  |
Trade receivables payment terms | 90 days |  |
Bills receivables discounted maturity period | 12 months |  |
Bottom of range [member] |  |  |
Disclosure of trade and other receivables [line items] |  |  |
Trade receivables payment terms | 60 days |  |

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- Definition Bills receivable discounted with banks with recourse obligation. + References No definition available. + Details
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Namespace Prefix: | ck0000932695_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Bills receivable endorsed with recourse obligation. + References No definition available. + Details
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Namespace Prefix: | ck0000932695_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Bills receivables discounted maturity period. + References No definition available. + Details
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- Definition Disclosure of trade and other receivables. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Trade receivables payment terms. + References No definition available. + Details
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- Definition Trade receivables write off. + References No definition available. + Details
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Namespace Prefix: | ck0000932695_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |