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Summary of Group's Operating Segment Results (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Segment Reporting Information [Line Items]        
Total revenues       ¥ 84,809
Total revenues ¥ 107,413 $ 15,429 ¥ 102,277  
Operating costs and expenses:        
Cost of revenues 62,850 9,028 51,744 43,062
Selling, general and administrative 19,910 2,860 19,231 13,128
Research and development 18,346 2,635 15,772 12,928
Total operating costs and expenses 101,106 14,523 86,747 69,118
Operating profit (loss) 6,307 906 15,530 15,691
Total other income (loss), net (6,647) (955) 11,795 5,592
Income (loss) before income taxes (340) (49) 27,325 21,283
Income taxes 1,948 279 4,743 2,995
Net income (loss) (2,288) (328) 22,582 18,288
Less: net (loss) income attributable to noncontrolling interests (4,345) (624) (4,991) (13)
Net income (loss) attributable to Baidu, Inc. 2,057 296 27,573 18,301
Operating Segments | Baidu Core        
Segment Reporting Information [Line Items]        
Total revenues       67,681
Total revenues 79,711 11,450 78,271  
Operating costs and expenses:        
Cost of revenues 34,019 4,887 25,370 25,688
Selling, general and administrative 14,733 2,116 15,310 10,586
Research and development 15,698 2,255 13,783 11,692
Total operating costs and expenses 64,450 9,258 54,463 47,966
Operating profit (loss) 15,261 2,192 23,808 19,715
Total other income (loss), net (5,680) (816) 13,169 5,385
Income (loss) before income taxes 9,581 1,376 36,977 25,100
Income taxes 1,896 272 4,664 3,001
Net income (loss) 7,685 1,104 32,313 22,099
Less: net (loss) income attributable to noncontrolling interests 105 15 (1,292) (9)
Net income (loss) attributable to Baidu, Inc. 7,580 1,089 33,605 22,108
Operating Segments | iQIYI        
Segment Reporting Information [Line Items]        
Total revenues       17,378
Total revenues 28,994 4,165 24,989  
Operating costs and expenses:        
Cost of revenues 30,348 4,359 27,133 17,386
Selling, general and administrative 5,237 753 4,168 2,675
Research and development 2,667 383 1,994 1,270
Total operating costs and expenses 38,252 5,495 33,295 21,331
Operating profit (loss) (9,258) (1,330) (8,306) (3,953)
Total other income (loss), net (967) (139) (676) 208
Income (loss) before income taxes (10,225) (1,469) (8,982) (3,745)
Income taxes 52 7 79 (8)
Net income (loss) (10,277) (1,476) (9,061) (3,737)
Less: net (loss) income attributable to noncontrolling interests 46 7 49  
Net income (loss) attributable to Baidu, Inc. (10,323) (1,483) (9,110) (3,737)
Intersegment Eliminations & Adjustments        
Segment Reporting Information [Line Items]        
Total revenues       (250)
Total revenues (1,292) (186) (983)  
Operating costs and expenses:        
Cost of revenues (1,517) (218) (759) (12)
Selling, general and administrative (60) (9) (247) (133)
Research and development (19) (3) (5) (34)
Total operating costs and expenses (1,596) (230) (1,011) (179)
Operating profit (loss) 304 44 28 (71)
Total other income (loss), net     (698) (1)
Income (loss) before income taxes 304 44 (670) (72)
Income taxes       2
Net income (loss) 304 44 (670) (74)
Less: net (loss) income attributable to noncontrolling interests (4,496) (646) (3,748) (4)
Net income (loss) attributable to Baidu, Inc. ¥ 4,800 $ 690 ¥ 3,078 ¥ (70)