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Summary of Group's Segment Operating Results (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Revenues:        
Online marketing services $ 11,242 ¥ 73,146 ¥ 64,525 ¥ 64,037
Other services 1,792 11,663 6,024 2,345
Total revenues 13,034 84,809 70,549 66,382
Operating costs and expenses:        
Cost of revenues (6,619) (43,062) (35,278) (27,458)
Selling, general and administrative (2,018) (13,128) (15,071) (17,076)
Research and development (1,987) (12,928) (10,151) (10,176)
Total operating costs and expenses (10,624) (69,118) (60,500) (54,710)
Operating profit (loss) 2,410 15,691 10,049 11,672
Other income:        
Interest income 485 3,154 2,342 2,362
Interest expense (248) (1,615) (1,158) (1,041)
Foreign exchange (loss) income, net (74) (482) 508 182
Income (loss) from equity method investments (10) (63) (1,026) 4
Other income (loss), net 707 4,598 3,794 24,728
Total other income (loss), net 860 5,592 4,460 26,235
Income (loss) before income taxes 3,270 21,283 14,509 37,907
Income taxes (460) (2,995) (2,913) (5,475)
Net income (loss) 2,810 18,288 11,596 32,432
Operating Segments | Baidu Core        
Revenues:        
Online marketing services 9,818 63,880 57,944 60,312
Other services 584 3,801 1,526 917
Total revenues 10,402 67,681 59,470 61,229
Operating costs and expenses:        
Cost of revenues (3,949) (25,688) (23,806) (21,591)
Selling, general and administrative (1,627) (10,586) (13,493) (15,917)
Research and development (1,797) (11,692) (9,298) (9,671)
Total operating costs and expenses (7,373) (47,966) (46,597) (47,179)
Operating profit (loss) 3,029 19,715 12,873 14,050
Other income:        
Interest income 497 3,231 2,426 2,413
Interest expense (230) (1,497) (1,149) (1,041)
Foreign exchange (loss) income, net (136) (883) 747 238
Income (loss) from equity method investments (10) (63) (1,026) 5
Other income (loss), net 707 4,597 3,732 24,736
Total other income (loss), net 828 5,385 4,730 26,351
Income (loss) before income taxes 3,857 25,100 17,603 40,401
Income taxes (461) (3,001) (2,915) (5,523)
Net income (loss) 3,396 22,099 14,688 34,878
Operating Segments | iQIYI        
Revenues:        
Online marketing services 1,254 8,159 5,650 3,400
Other services 1,417 9,219 5,587 1,919
Total revenues 2,671 17,378 11,237 5,319
Operating costs and expenses:        
Cost of revenues (2,672) (17,386) (11,437) (6,042)
Selling, general and administrative (411) (2,675) (1,766) (1,204)
Research and development (195) (1,270) (824) (500)
Total operating costs and expenses (3,278) (21,331) (14,027) (7,746)
Operating profit (loss) (607) (3,953) (2,790) (2,427)
Other income:        
Interest income 13 83 17 5
Interest expense (43) (278) (110) (55)
Foreign exchange (loss) income, net 62 401 (239) (77)
Income (loss) from equity method investments 0 0 0 (1)
Other income (loss), net 0 2 61 (8)
Total other income (loss), net 32 208 (271) (136)
Income (loss) before income taxes (575) (3,745) (3,061) (2,563)
Income taxes 1 8 (13) (11)
Net income (loss) (574) (3,737) (3,074) (2,574)
Intersegment Eliminations & Adjustments        
Revenues:        
Online marketing services 170 1,107 931 325
Other services (209) (1,357) (1,089) (491)
Total revenues (39) (250) (158) (166)
Operating costs and expenses:        
Cost of revenues 2 12 (35) 175
Selling, general and administrative 20 133 188 45
Research and development 5 34 (29) (5)
Total operating costs and expenses 27 179 124 215
Operating profit (loss) (12) (71) (34) 49
Other income:        
Interest income (25) (160) (101) (56)
Interest expense 25 160 101 55
Foreign exchange (loss) income, net 0 0 0 21
Income (loss) from equity method investments 0 0 0 0
Other income (loss), net 0 (1) 1 0
Total other income (loss), net 0 (1) 1 20
Income (loss) before income taxes (12) (72) (33) 69
Income taxes 0 (2) 15 59
Net income (loss) $ (12) ¥ (74) ¥ (18) ¥ 128