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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