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Summary of Changes in Equity and Redeemable Noncontrolling Interests (Detail) ¥ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) shares | Sep. 30, 2018 CNY (¥) shares | Sep. 30, 2017 CNY (¥) | Sep. 30, 2018 USD ($) shares | Sep. 30, 2018 CNY (¥) shares | Sep. 30, 2017 CNY (¥)
Class of Stock [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | ¥ 119,350 |
Cumulative effect of accounting change |  |  | ¥ 967 |  |  | 967 |
Net income (loss) |  |  |  |  |  | 22,014 |
Other comprehensive income (loss) |  |  |  |  |  | 2,330 |
Business combination |  |  |  |  |  | 1,013 |
Issuance of subsidiary shares |  |  |  |  |  | 14,168 |
Exercise of share-based awards |  |  |  |  |  | 686 |
Share-based compensation |  |  |  |  |  | 3,048 |
Accretion of redeemable non-controlling interests |  | $ 0 | 0 | ¥ 466 | $ (19) | (128) | ¥ (173)
Disposal of a subsidiary's shares |  |  |  |  |  | 1,558 |
Repurchase and retirement of ordinary shares |  |  |  |  | (487) | (3,312) |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | 11,150 |
Balances |  | 25,166 | 172,844 |  | 25,166 | 172,844 |
Balances |  |  |  |  |  | 11,022 |
Accretion of redeemable non-controlling interests |  |  |  |  |  | 128 |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | (11,150) |
Balances |  | $ 0 | 0 |  | $ 0 | ¥ 0 |
Ordinary Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Balances (in shares) | shares |  |  |  |  | 34,816,232 | 34,816,232 |
Balances |  |  |  |  |  | ¥ 0 |
Cumulative effect of accounting change |  |  | ¥ 0 |  |  | 0 |
Net income (loss) |  |  |  |  |  | 0 |
Other comprehensive income (loss) |  |  |  |  |  | 0 |
Business combination |  |  |  |  |  | 0 |
Issuance of subsidiary shares |  |  |  |  |  | 0 |
Exercise of share-based awards |  |  |  |  |  | ¥ 0 |
Exercise of share-based awards, shares | shares |  |  |  |  | 246,989 | 246,989 |
Share-based compensation |  |  |  |  |  | ¥ 0 |
Accretion of redeemable non-controlling interests |  |  |  |  |  | 0 |
Disposal of a subsidiary's shares |  |  |  |  |  | 0 |
Repurchase and retirement of ordinary shares |  |  |  |  |  | ¥ 0 |
Repurchase and retirement of ordinary shares (in shares) | shares |  |  |  |  | (207,165) | (207,165) |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | ¥ 0 |
Balances (in shares) | shares |  | 34,856,056 | 34,856,056 |  | 34,856,056 | 34,856,056 |
Balances |  | $ 0 | ¥ 0 |  | $ 0 | ¥ 0 |
Additional Paid-in Capital |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | 12,088 |
Cumulative effect of accounting change |  |  | 0 |  |  | 0 |
Net income (loss) |  |  |  |  |  | 0 |
Other comprehensive income (loss) |  |  |  |  |  | 0 |
Business combination |  |  |  |  |  | 75 |
Issuance of subsidiary shares |  |  |  |  |  | 14,990 |
Exercise of share-based awards |  |  |  |  |  | 685 |
Share-based compensation |  |  |  |  |  | 2,929 |
Accretion of redeemable non-controlling interests |  |  |  |  |  | 0 |
Disposal of a subsidiary's shares |  |  |  |  |  | 1,323 |
Repurchase and retirement of ordinary shares |  |  |  |  |  | 0 |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | 0 |
Balances |  | 4,672 | 32,090 |  | 4,672 | 32,090 |
Retained Earnings |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | 102,328 |
Cumulative effect of accounting change |  |  | 2,821 |  |  | 2,821 |
Net income (loss) |  |  |  |  |  | 25,492 |
Other comprehensive income (loss) |  |  |  |  |  | 0 |
Business combination |  |  |  |  |  | 0 |
Issuance of subsidiary shares |  |  |  |  |  | 0 |
Exercise of share-based awards |  |  |  |  |  | 0 |
Share-based compensation |  |  |  |  |  | 0 |
Accretion of redeemable non-controlling interests |  |  |  |  |  | (128) |
Disposal of a subsidiary's shares |  |  |  |  |  | 0 |
Repurchase and retirement of ordinary shares |  |  |  |  |  | (3,312) |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | 0 |
Balances |  | 18,521 | 127,201 |  | 18,521 | 127,201 |
Accumulated Other Comprehensive Income |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | 930 | (1,783)
Cumulative effect of accounting change | [1] |  | (1,854) |  |  | (1,854) |
Net income (loss) |  |  |  |  |  | 0 |
Other comprehensive income (loss) |  |  |  |  |  | 1,323 |
Business combination |  |  |  |  |  | 0 |
Issuance of subsidiary shares |  |  |  |  |  | 0 |
Exercise of share-based awards |  |  |  |  |  | 0 |
Share-based compensation |  |  |  |  |  | 0 |
Accretion of redeemable non-controlling interests |  |  |  |  |  | 0 |
Disposal of a subsidiary's shares |  |  |  |  |  | 0 |
Repurchase and retirement of ordinary shares |  |  |  |  |  | 0 |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | 0 |
Balances |  | 58 | 399 | ¥ 70 | 58 | 399 | ¥ 70
Non-controlling Interests |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Balances |  |  |  |  |  | 4,004 |
Cumulative effect of accounting change |  |  | 0 |  |  | 0 |
Net income (loss) |  |  |  |  |  | (3,478) |
Other comprehensive income (loss) |  |  |  |  |  | 1,007 |
Business combination |  |  |  |  |  | 938 |
Issuance of subsidiary shares |  |  |  |  |  | (822) |
Exercise of share-based awards |  |  |  |  |  | 1 |
Share-based compensation |  |  |  |  |  | 119 |
Accretion of redeemable non-controlling interests |  |  |  |  |  | 0 |
Disposal of a subsidiary's shares |  |  |  |  |  | 235 |
Repurchase and retirement of ordinary shares |  |  |  |  |  | 0 |
Conversion of iQIYI preferred shares recognized as redeemable noncontrolling interests to ordinary shares |  |  |  |  |  | 11,150 |
Balances |  | $ 1,915 | ¥ 13,154 |  | $ 1,915 | ¥ 13,154 |
[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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