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Cover Page
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2021
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Entity Registrant Name Kingsoft Cloud Holdings Ltd
Entity Central Index Key 0001795589
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 3,646,381,840
Entity Shell Company false
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
Entity File Number 001-39278
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Building E, Xiaomi Science and Technology Park, No. 33 Xierqi Middle Road
Entity Address, Address Line Two Haidian District
Entity Address, City or Town Beijing
Entity Address, Postal Zip Code 100085
Entity Address, Country CN
ICFR Auditor Attestation Flag true
Auditor Name Ernst & Young Hua Ming LLP
Auditor Firm ID 1408
Auditor Location Beijing, the People’s Republic of China
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Haijian He
Entity Address, Address Line One Building E, Xiaomi Science and Technology Park, No. 33 Xierqi Middle Road
Entity Address, Address Line Two Haidian District
Entity Address, City or Town Beijing
Entity Address, Postal Zip Code 100085
Entity Address, Country CN
City Area Code 86
Extension 10
Local Phone Number 6292 7777
American Depositary Shares [Member]  
Document Information [Line Items]  
Title of 12(b) Security American depositary shares, each ADS represents 15 ordinary shares, par value US$0.001 per share
Trading Symbol KC
Security Exchange Name NASDAQ
Ordinary Shares [Member]  
Document Information [Line Items]  
Title of 12(b) Security Ordinary shares, par value US$0.001 per share
No Trading Symbol Flag true
Security Exchange Name NASDAQ