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Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 29 Months Ended 0 Months Ended 3 Months Ended
Jan. 09, 2009
Patent Matters [Member]
Rambus Patent Litigation Delaware [Member]
integer
Aug. 28, 2000
Patent Matters [Member]
Rambus Patent Litigation Delaware [Member]
integer
Jan. 02, 2013
Patent Matters [Member]
Rambus Patent Litigation Delaware [Member]
Legal Opinion [Member]
Scenario, Forecast [Member]
integer
Jan. 13, 2006
Patent Matters [Member]
Rambus Patent Litigation Northern California [Member]
integer
Nov. 29, 2012
Patent Matters [Member]
HSM Portfolio LLC and Technology Properties LLC [Member]
integer
Sep. 01, 2011
Patent Matters [Member]
HSM Portfolio LLC and Technology Properties LLC [Member]
integer
Nov. 29, 2012
Patent Matters [Member]
Advanced Data Access LLC [Member]
integer
Nov. 16, 2011
Patent Matters [Member]
Advanced Data Access LLC [Member]
integer
Sep. 14, 2011
Patent Matters [Member]
Smart Memory Solutions LLC [Member]
integer
Nov. 29, 2012
Patent Matters [Member]
Board Of Trustees For The University Of Illinois [Member]
integer
Dec. 05, 2011
Patent Matters [Member]
Board Of Trustees For The University Of Illinois [Member]
integer
Mar. 26, 2012
Patent Matters [Member]
Semiconductor Technologies, LLC [Member]
integer
Apr. 27, 2012
Patent Matters [Member]
Semcon Tech, LLC [Member]
integer
Nov. 29, 2012
Antitrust Matters [Member]
Rambus DRAM Complaint [Member]
Jul. 31, 2006
Antitrust Matters [Member]
DRAM Purported Class Action Price-fixing Lawsuit [Member]
integer
Nov. 29, 2012
Antitrust Matters [Member]
DRAM Purported Class Action Price-fixing Lawsuit [Member]
integer
Nov. 29, 2012
Antitrust Matters [Member]
DRAM Purported Class Action Price-fixing Lawsuit [Member]
integer
Jun. 23, 2010
Antitrust Matters [Member]
DRAM Purported Class Action Price-fixing Lawsuit [Member]
integer
Oct. 16, 2012
Antitrust Matters [Member]
Canadian DRAM Putative Class Action Price-fixing Lawsuit [Member]
integer
Nov. 29, 2012
Antitrust Matters [Member]
Canadian DRAM Putative Class Action Price-fixing Lawsuit [Member]
integer
Nov. 29, 2012
Commercial Matters [Member]
Qimonda AG Inotera Share Purchase Proceedings [Member]
Inotera [Member]
Loss Contingencies [Line Items]                                          
Alleged number of patents infringed   12   14   2   2 1   3 5 1                
Number of petitions submitted for inter-partes review                   3                      
Court ruling patents unenforceable against us due to spoliation (number of patents) 12   12                                    
Number of other defendants         17   7                            
Approximation of damages claimed                           $ 3,900              
Number of lawsuits filed                               68 68     3  
Approximate number of U.S. states and territories filing suit                             40            
Settlement agreement execution date                               June 23, 2010       October 16, 2012  
Settlement agreement amount                                   67      
Settlement agreement number of installment payments                                   3      
Settlement agreement number of years for installment payments (in years)                                   2 years      
Amount paid into an escrow account in connection with settlement                                 67        
Loss Contingency, Claims Settled and Dismissed, Number                                     3    
Equity method investment net carrying value of shares acquired from Qimonda                                         $ 149