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Cash, Cash Equivalents, and Marketable Securities (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents$ 10,630$ 13,630$ 11,257$ 10,198
Marketable securities31,93021,345  
Total cash, cash equivalents, and marketable securities42,56034,975  
Cash
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents4,2094,652  
Cash equivalents | Time deposits
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents112973  
Cash equivalents | Money market and other funds
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents5,559[1]7,547[1]  
Cash equivalents | U.S. government agencies
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents4500  
Cash equivalents | U.S. government notes
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents300300  
Cash equivalents | Foreign government bonds
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents0150  
Cash equivalents | Corporate debt securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Cash and cash equivalents08  
Time deposits
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities414307  
U.S. government agencies
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities6,8601,857  
U.S. government notes
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities5,9613,930  
Foreign government bonds
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities1,9611,172  
Municipal securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities2,2522,503  
Corporate debt securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities7,2985,742  
Agency residential mortgage-backed securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities7,0625,673  
Marketable equity securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Marketable securities$ 122$ 161  
[1]The balances at December 31, 2010 and September 30, 2011 include $1.6 billion and $1.9 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.