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Summary of Group's Operating Segment Results (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 (¥)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total revenues |  |  | ¥ 23,489 |  |  | ¥ 61,254
Total revenues | $ 4,106 | ¥ 28,203 |  | $ 10,932 | ¥ 75,082 |
Operating costs and expenses: |  |  |  |  |  |
Cost of revenues | 2,070 | 14,218 | 11,801 | 5,261 | 36,133 | 31,616
Selling, general and administrative | 821 | 5,641 | 3,746 | 1,935 | 13,288 | 9,497
Research and development | 570 | 3,916 | 3,242 | 1,637 | 11,243 | 9,225
Total operating costs and expenses | 3,461 | 23,775 | 18,789 | 8,833 | 60,664 | 50,338
Operating profit (loss) | 645 | 4,428 | 4,700 | 2,099 | 14,418 | 10,916
Total other income (loss), net | 1,313 | 9,021 | 4,345 | 1,726 | 11,855 | 5,279
Income (loss) before income taxes | 1,958 | 13,449 | 9,045 | 3,825 | 26,273 | 16,195
Income taxes | 299 | 2,053 | 1,097 | 620 | 4,259 | 2,066
Net income (loss) | 1,659 | 11,396 | 7,948 | 3,205 | 22,014 | 14,129
Less: net income (loss) attributable to noncontrolling interests | (146) | (1,000) | (1) | (506) | (3,478) | (12)
Net income (loss) attributable to Baidu, Inc. | 1,805 | 12,396 | 7,949 | 3,711 | 25,492 | 14,141
Operating Segments | Baidu Core |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total revenues |  |  | 18,342 |  |  | 48,571
Total revenues | 3,145 | 21,606 |  | 8,409 | 57,751 |
Operating costs and expenses: |  |  |  |  |  |
Cost of revenues | 990 | 6,804 | 6,829 | 2,620 | 17,995 | 18,907
Selling, general and administrative | 645 | 4,428 | 3,023 | 1,532 | 10,522 | 7,623
Research and development | 489 | 3,359 | 2,901 | 1,435 | 9,859 | 8,337
Total operating costs and expenses | 2,124 | 14,591 | 12,753 | 5,587 | 38,376 | 34,867
Operating profit (loss) | 1,021 | 7,015 | 5,589 | 2,822 | 19,375 | 13,704
Total other income (loss), net | 1,409 | 9,687 | 4,292 | 1,921 | 13,199 | 5,266
Income (loss) before income taxes | 2,430 | 16,702 | 9,881 | 4,743 | 32,574 | 18,970
Income taxes | 300 | 2,059 | 1,098 | 620 | 4,260 | 2,062
Net income (loss) | 2,130 | 14,643 | 8,783 | 4,123 | 28,314 | 16,908
Less: net income (loss) attributable to noncontrolling interests | 49 | 334 | (1) | (181) | (1,241) | (9)
Net income (loss) attributable to Baidu, Inc. | 2,081 | 14,309 | 8,784 | 4,304 | 29,555 | 16,917
Operating Segments | iQIYI |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total revenues |  |  | 4,951 |  |  | 12,561
Total revenues | 1,007 | 6,914 |  | 2,615 | 17,961 |
Operating costs and expenses: |  |  |  |  |  |
Cost of revenues | 1,115 | 7,655 | 4,898 | 2,710 | 18,610 | 12,852
Selling, general and administrative | 188 | 1,292 | 777 | 429 | 2,945 | 1,902
Research and development | 81 | 558 | 343 | 202 | 1,387 | 905
Total operating costs and expenses | 1,384 | 9,505 | 6,018 | 3,341 | 22,942 | 15,659
Operating profit (loss) | (377) | (2,591) | (1,067) | (726) | (4,981) | (3,098)
Total other income (loss), net | (78) | (539) | 16 | (93) | (643) | (25)
Income (loss) before income taxes | (455) | (3,130) | (1,051) | (819) | (5,624) | (3,123)
Income taxes | (1) | (6) | 1 | 0 | (1) | 2
Net income (loss) | (454) | (3,124) | (1,052) | (819) | (5,623) | (3,125)
Less: net income (loss) attributable to noncontrolling interests | 2 | 16 | 0 | 2 | 10 | 0
Net income (loss) attributable to Baidu, Inc. | (456) | (3,140) | (1,052) | (821) | (5,633) | (3,125)
Intersegment Eliminations & Adjustments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total revenues |  |  | 196 |  |  | 122
Total revenues | (46) | (317) |  | (92) | (630) |
Operating costs and expenses: |  |  |  |  |  |
Cost of revenues | (35) | (241) | 74 | (69) | (472) | (143)
Selling, general and administrative | (12) | (79) | (54) | (26) | (179) | (28)
Research and development | 0 | (1) | (2) | 0 | (3) | (17)
Total operating costs and expenses | (47) | (321) | 18 | (95) | (654) | (188)
Operating profit (loss) | 1 | 4 | 178 | 3 | 24 | 310
Total other income (loss), net | (18) | (127) | 37 | (102) | (701) | 38
Income (loss) before income taxes | (17) | (123) | 215 | (99) | (677) | 348
Income taxes | 0 | 0 | (2) | 0 | 0 | 2
Net income (loss) | (17) | (123) | 217 | (99) | (677) | 346
Less: net income (loss) attributable to noncontrolling interests | (197) | (1,350) | 0 | (327) | (2,247) | (3)
Net income (loss) attributable to Baidu, Inc. | $ 180 | ¥ 1,227 | ¥ 217 | $ 228 | ¥ 1,570 | ¥ 349

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