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Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Balances (Detail) ¥ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2013 CNY (¥)
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Provision for doubtful receivables | $ 44 | ¥ 287 | ¥ 138 |
Accrued expenses, payroll and others | 438 | 2,849 | 2,715 |
Fixed assets depreciation | 8 | 53 | 26 |
Net operating loss carry-forward | 163 | 1,061 | 1,727 |
Less: valuation allowance | (418) | (2,718) | (3,506) |
Deferred tax assets, net | 235 | 1,532 | 1,100 |
Deferred tax liabilities: |  |  |  |
Long-lived assets arising from acquisitions | 20 | 133 | 248 |
Withholding tax on PRC subsidiaries' undistributed earnings | 91 | 586 | 633 | ¥ 581
Withholding tax on capital gains derived from PRC | 408 | 2,656 | 2,708 |
Deferred tax liabilities | $ 519 | ¥ 3,375 | ¥ 3,589 |

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