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Cash, Cash Equivalents, and Marketable Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents $ 9,983 $ 13,630 $ 10,198 $ 8,657
Marketable securities 34,643 21,345    
Total cash, cash equivalents, and marketable securities 44,626 34,975    
Time deposits
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 495 307    
U.S. government agencies
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 6,226 1,857    
U.S. government notes
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 11,579 3,930    
Foreign government bonds
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 1,629 1,172    
Municipal securities
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 1,794 2,503    
Corporate debt securities
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 6,112 5,742    
Agency residential mortgage-backed securities
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 6,501 5,673    
Marketable equity securities
       
Cash, cash equivalents and marketable securities [Line Items]        
Marketable securities 307 161    
Cash
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents 4,712 4,652    
Cash equivalents | Time deposits
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents 534 973    
Cash equivalents | Money market and other funds
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents 4,462 [1] 7,547 [1]    
Cash equivalents | U.S. government agencies
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents 275 0    
Cash equivalents | U.S. government notes
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents 0 300    
Cash equivalents | Foreign government bonds
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents 0 150    
Cash equivalents | Corporate debt securities
       
Cash, cash equivalents and marketable securities [Line Items]        
Cash and cash equivalents $ 0 $ 8    
[1] The balances at December 31, 2010 and December 31, 2011 included $1.6 billion and $1.3 billion of cash collateral received in connection with our securities lending program, which was invested in reverse repurchase agreements maturing within three months. See below for further discussion on this program.