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Investment - Schedule of Investments at Amortized Cost and Fair Value (Detail) ¥ in Millions, $ in Millions | Jun. 30, 2020 CNY (¥) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | ---
Short-term Investments |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Held-to-maturity debt investments, fair value | ¥ 126,071 | $ 17,844 | ¥ 107,654
Available-for-sale debt investments, fair value | 7,152 | 1,012 | 5,637
Short-term Investments | Corporate Debt Securities |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Held-to-maturity debt investments, cost or amortized cost | 125,022 |  | 107,287
Held-to-maturity debt investments, gross unrecognized holding gains | 1,049 |  | 367
Held-to-maturity debt investments, fair value | 126,071 | 17,844 | 107,654
Available-for-sale debt investments, cost or amortized cost | 7,138 |  | 5,440
Available-for-sale debt investments, gross unrealized gains | 14 |  | 197
Available-for-sale debt investments, fair value | 7,152 | 1,012 | 5,637
Long-term investments |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Held-to-maturity debt investments, fair value | 513 | 73 | 491
Available-for-sale debt investments, fair value | 3,601 | 510 | 3,970
Equity investments at fair value with readily determinable fair value, fair value | 12,469 | 1,765 | 11,334
Investments accounted for at fair value, fair value | 1,831 | 259 | 1,819
Long-term investments | Corporate Debt Securities |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Held-to-maturity debt investments, gross unrecognized holding gains | 11 |  |
Held-to-maturity debt investments, fair value | 513 | 73 | 491
Available-for-sale debt investments, cost or amortized cost | 3,528 |  | 3,913
Available-for-sale debt investments, gross unrealized gains | 186 |  | 138
Available-for-sale debt investments, gross unrealized losses | (113) |  | (81)
Available-for-sale debt investments, fair value | 3,601 | 510 | 3,970
Investments accounted for at fair value, cost or amortized cost | 1,430 |  | 1,309
Investments accounted for at fair value, gross unrealized Losses | (153) |  | (87)
Investments accounted for at fair value, gross unrealized gains | 554 |  | 597
Investments accounted for at fair value, fair value | 1,831 | 259 | 1,819
Debt Securities, Held-to-maturity, Noncurrent | 502 |  | 496
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  |  | (5)
Long-term investments | Ordinary Shares |  |  |
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 | 12,346 |  | 11,769
Equity investments at fair value with readily determinable fair value, gross unrealized gains | 3,632 |  | 2,195
Equity investments at fair value with readily determinable fair value, gross unrealized loss | (3,509) |  | (2,630)
Equity investments at fair value with readily determinable fair value, fair value | ¥ 12,469 | $ 1,765 | ¥ 11,334

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