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Business developments (Details 3)
In Millions, unless otherwise specified
Feb. 25, 2013
Oct. 23, 2013
Nov. 04, 2013
Jun. 16, 2014
Crescent Holding GmbH        
Related party disclosures        
Shares held by related party 88.5cs_EquityInvestmentsByAffiliatesShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_CrescentHoldingGmbhMember		      
Portion of registered Group shares held by related party (as a percent) 6.70%cs_EquityInvestmentsByAffiliatesPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_CrescentHoldingGmbhMember		      
Qatar Holding LLC        
Related party disclosures        
Shares held by related party   82.0cs_EquityInvestmentsByAffiliatesShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_QatarHoldingLlcMember		    
Portion of registered Group shares held by related party (as a percent)   5.20%cs_EquityInvestmentsByAffiliatesPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_QatarHoldingLlcMember		    
Harris Associates LP        
Related party disclosures        
Shares held by related party     81.5cs_EquityInvestmentsByAffiliatesShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_HarrisAssociatesLpMember		  
Portion of registered Group shares held by related party (as a percent)     5.20%cs_EquityInvestmentsByAffiliatesPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_HarrisAssociatesLpMember		  
Norges Bank        
Related party disclosures        
Shares held by related party       80.0cs_EquityInvestmentsByAffiliatesShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_NorgesBankMember
Portion of registered Group shares held by related party (as a percent)       5.00%cs_EquityInvestmentsByAffiliatesPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cs_NorgesBankMember