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Changes in Accumulated Other Comprehensive (Loss) Income by Component, Net of Tax (Detail) ¥ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | ¥ 119,350 |
Cumulative effect of accounting change |  |  | ¥ 967 |  |  | 967 |
Net current-period other comprehensive income |  | $ 70 | 483 | ¥ 872 | $ 69 | 476 | ¥ 1,661
Balances |  | 25,166 | 172,844 |  | 25,166 | 172,844 |
Foreign currency translation adjustment |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | (888) | (2,022)
Cumulative effect of accounting change | [1] |  | 0 |  |  | 0 |
Other comprehensive income before reclassification |  |  |  |  |  | 79 | 974
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  | 80 | 48
Net current-period other comprehensive income |  |  |  |  |  | 159 | 1,022
Other comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  | (992) | 192
Balances |  | (251) | (1,721) | (808) | (251) | (1,721) | (808)
Unrealized gains on available- for-sale investments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | 1,818 | 239
Cumulative effect of accounting change | [1] |  | (1,854) |  |  | (1,854) |
Other comprehensive income before reclassification |  |  |  |  |  | 3,529 | 1,406
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  | (1,358) | (767)
Net current-period other comprehensive income |  |  |  |  |  | 317 | 639
Other comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  | (15) | 0
Balances |  | 309 | 2,120 | 878 | 309 | 2,120 | 878
Accumulated Other Comprehensive Income |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | 930 | (1,783)
Cumulative effect of accounting change | [1] |  | (1,854) |  |  | (1,854) |
Other comprehensive income before reclassification |  |  |  |  |  | 3,608 | 2,380
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  | (1,278) | (719)
Net current-period other comprehensive income |  |  |  |  |  | 476 | 1,661
Other comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  | (1,007) | 192
Balances |  | $ 58 | ¥ 399 | ¥ 70 | $ 58 | ¥ 399 | ¥ 70
[1] | Adjustment of net unrealized gains related to available-for-sale equity investments from accumulated other comprehensive income to opening retained earnings as a result of the adoption of ASC 321 on January 1, 2018.

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