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Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balances |  | ¥ 175,036 |  | ¥ 119,350 | ¥ 92,251
Cumulative effect of accounting change* |  |  |  | 933 |
Net current-period other comprehensive income (loss) |  | (1,490) | $ (215) | 286 | 2,378
Balances |  | 171,706 | 24,663 | 175,036 | 119,350
Foreign currency translation adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balances |  | (1,700) |  | (888) | (2,026)
Other comprehensive income (loss) before reclassification |  | 207 |  | 114 | 732
Amounts reclassified from accumulated other comprehensive income (loss) |  | (989) |  | 80 | 71
Net current-period other comprehensive income (loss) |  | (782) |  | 194 | 803
Other comprehensive loss (income) attribute to noncontrolling interests and redeemable noncontrolling interests |  | (102) |  | (1,006) | 335
Balances |  | (2,584) | (372) | (1,700) | (888)
Unrealized gains on available- for-sale investments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balances |  | 1,910 |  | 1,818 | 243
Cumulative effect of accounting change* | [1] |  |  | (1,854) |
Other comprehensive income (loss) before reclassification |  | 1,981 |  | 4,117 | 2,574
Amounts reclassified from accumulated other comprehensive income (loss) |  | (2,689) |  | (2,171) | (999)
Net current-period other comprehensive income (loss) |  | (708) |  | 92 | 1,575
Other comprehensive loss (income) attribute to noncontrolling interests and redeemable noncontrolling interests |  | (1) |  |  |
Balances |  | 1,201 | 173 | 1,910 | 1,818
Accumulated Other Comprehensive Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balances |  | 210 |  | 930 | (1,783)
Cumulative effect of accounting change* | [1] |  |  | (1,854) |
Other comprehensive income (loss) before reclassification |  | 2,188 |  | 4,231 | 3,306
Amounts reclassified from accumulated other comprehensive income (loss) |  | (3,678) |  | (2,091) | (928)
Net current-period other comprehensive income (loss) |  | (1,490) |  | 286 | 2,378
Other comprehensive loss (income) attribute to noncontrolling interests and redeemable noncontrolling interests |  | (103) |  | (1,006) | 335
Balances |  | ¥ (1,383) | $ (199) | ¥ 210 | ¥ 930
[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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