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Schedule of Investments at Amortized Cost and Fair Value (Detail) ¥ in Millions, $ in Millions | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
--- | --- | --- | ---
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Equity investments at fair value with readily determinable fair value, fair value | $ 609 | ¥ 4,200 |
Trading Securities |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Other invested securities, cost or amortized cost |  |  | ¥ 18,289
Other invested securities, gross unrealized gains |  |  | 169
Other invested securities, gross unrealized losses |  |  | (108)
Other invested securities, fair value |  |  | 18,350
Other Long-term Investments |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Available-for-sale debt investments, cost or amortized cost |  | 2,000 |
Available-for-sale debt investments, gross unrealized gains |  | 23 |
Available-for-sale debt investments, fair value | 294 | 2,023 |
Available-for-sale equity investments, cost or amortized cost |  |  | 2,077
Available-for-sale equity investments, gross unrealized gains |  |  | 742
Available-for-sale equity investments, gross unrealized losses |  |  | (46)
Available-for-sale equity investments, fair value |  |  | 2,773
Other Long-term Investments | Equity Investments |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Equity investments at fair value with readily determinable fair value, cost or amortized cost |  | 4,808 |
Equity investments at fair value with readily determinable fair value, gross unrealized gains |  | 1,022 |
Equity investments at fair value with readily determinable fair value, gross unrealized loss |  | (827) |
Equity investments at fair value with readily determinable fair value, fair value | 728 | 5,003 |
Investments accounted for at fair value, cost or amortized cost |  | 977 | 307
Investments accounted for at fair value, gross unrealized gains |  | 302 | 14
Investments accounted for at fair value, fair value | 186 | 1,279 | 321
Short-term Investments |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Held-to-maturity debt investments, cost or amortized cost |  | 31,939 | 48,666
Held-to-maturity debt investments, gross unrecognized holding gains |  | 166 | 47
Held-to-maturity debt investments, gross unrecognized holding losses |  |  | (18)
Held-to-maturity debt investments, fair value | 4,675 | 32,105 | 48,695
Available-for-sale debt investments, cost or amortized cost |  | 55,520 | 40,139
Available-for-sale debt investments, gross unrealized gains |  | 1,313 | 581
Available-for-sale debt investments, gross unrealized losses |  | (56) | (5)
Available-for-sale debt investments, fair value | $ 8,267 | ¥ 56,777 | ¥ 40,715

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