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Components of Accumulated Other Comprehensive Income (Loss) (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | ¥ 92,251 | ¥ 80,266 | ¥ 52,157
Other comprehensive income (loss) before reclassification |  | 3,306 | (78) | (156)
Amounts reclassified from accumulated other comprehensive income |  | (928) | (572) | (194)
Other comprehensive (loss) income, net of tax | $ 365 | 2,378 | (650) | (350)
Other comprehensive income (loss) attribute to noncontrolling interests and redeemable noncontrolling interests |  | 335 | (327) | (176)
Balances | 18,344 | 119,350 | 92,251 | 80,266
Foreign currency translation adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | (2,026) | (1,106) | (285)
Other comprehensive income (loss) before reclassification |  | 732 | (593) | (645)
Amounts reclassified from accumulated other comprehensive income |  | 71 | 0 | 0
Other comprehensive (loss) income, net of tax |  | 803 | (593) | (645)
Other comprehensive income (loss) attribute to noncontrolling interests and redeemable noncontrolling interests |  | 335 | (327) | (176)
Balances | (136) | (888) | (2,026) | (1,106)
Unrealized gains on available- for-sale investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | 243 | 300 | 5
Other comprehensive income (loss) before reclassification |  | 2,574 | 515 | 489
Amounts reclassified from accumulated other comprehensive income |  | (999) | (572) | (194)
Other comprehensive (loss) income, net of tax |  | 1,575 | (57) | 295
Other comprehensive income (loss) attribute to noncontrolling interests and redeemable noncontrolling interests |  | 0 | 0 | 0
Balances | 279 | 1,818 | 243 | 300
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | (1,783) | (806) | (280)
Balances | $ 143 | ¥ 930 | ¥ (1,783) | ¥ (806)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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