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Cash Cash Equivalents And Marketable Securities Measured At Adjusted Cost Gross unrealized Gains Gross Unrealized Losses And Fair Value By Significant Investment Categories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost $ 47,278 $ 44,157    
Gross Unrealized Gains 840 583    
Gross Unrealized Losses (30) (114)    
Total cash, cash equivalents, and marketable securities 48,088 44,626    
Cash and Cash Equivalents 14,778 9,983 13,630 10,198
Marketable securities 33,310 34,643    
Cash
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 8,066 4,712    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Total cash, cash equivalents, and marketable securities 8,066 4,712    
Cash and Cash Equivalents 8,066 4,712    
Marketable securities 0 0    
Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 16,086 14,905    
Gross Unrealized Gains 165 183    
Gross Unrealized Losses (1) 0    
Total cash, cash equivalents, and marketable securities 16,250 15,088    
Cash and Cash Equivalents 5,221 3,202    
Marketable securities 11,029 11,886    
Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market and other funds
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 5,221 3,202    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Total cash, cash equivalents, and marketable securities 5,221 3,202    
Cash and Cash Equivalents 5,221 3,202    
Marketable securities 0 0    
Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1) | US Government notes
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 10,853 11,475    
Gross Unrealized Gains 77 104    
Gross Unrealized Losses (1) 0    
Total cash, cash equivalents, and marketable securities 10,929 11,579    
Cash and Cash Equivalents 0 0    
Marketable securities 10,929 11,579    
Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 12 228    
Gross Unrealized Gains 88 79    
Gross Unrealized Losses 0 0    
Total cash, cash equivalents, and marketable securities 100 307    
Cash and Cash Equivalents 0 0    
Marketable securities 100 307    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 23,126 24,540    
Gross Unrealized Gains 675 400    
Gross Unrealized Losses (29) (114)    
Total cash, cash equivalents, and marketable securities 23,772 24,826    
Cash and Cash Equivalents 1,491 2,069    
Marketable securities 22,281 22,757    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Money market and other funds
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 929 [1] 1,260 [1]    
Gross Unrealized Gains 0 [1] 0 [1]    
Gross Unrealized Losses 0 [1] 0 [1]    
Total cash, cash equivalents, and marketable securities 929 [1] 1,260 [1]    
Cash and Cash Equivalents 929 [1] 1,260 [1]    
Marketable securities 0 [1] 0 [1]    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Time deposits
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 984 1,029    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Total cash, cash equivalents, and marketable securities 984 1,029    
Cash and Cash Equivalents 562 534    
Marketable securities 422 495    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | U.S. government agencies
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 1,882 6,486    
Gross Unrealized Gains 20 15    
Gross Unrealized Losses 0 0    
Total cash, cash equivalents, and marketable securities 1,902 6,501    
Cash and Cash Equivalents 0 275    
Marketable securities 1,902 6,226    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Foreign government bonds
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 1,996 1,608    
Gross Unrealized Gains 81 32    
Gross Unrealized Losses (3) (11)    
Total cash, cash equivalents, and marketable securities 2,074 1,629    
Cash and Cash Equivalents 0 0    
Marketable securities 2,074 1,629    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Municipal securities
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 2,249 1,775    
Gross Unrealized Gains 23 19    
Gross Unrealized Losses (6) 0    
Total cash, cash equivalents, and marketable securities 2,266 1,794    
Cash and Cash Equivalents 0 0    
Marketable securities 2,266 1,794    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Corporate debt securities
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 7,200 6,023    
Gross Unrealized Gains 414 187    
Gross Unrealized Losses (14) (98)    
Total cash, cash equivalents, and marketable securities 7,600 6,112    
Cash and Cash Equivalents 0 0    
Marketable securities 7,600 6,112    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Agency residential mortgage-backed securities
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 7,039 6,359    
Gross Unrealized Gains 136 147    
Gross Unrealized Losses (6) (5)    
Total cash, cash equivalents, and marketable securities 7,169 6,501    
Cash and Cash Equivalents 0 0    
Marketable securities 7,169 6,501    
Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2) | Asset-backed Securities
        
Cash, cash equivalents and marketable securities [Line Items]        
Adjusted Cost 847      
Gross Unrealized Gains 1      
Gross Unrealized Losses 0      
Total cash, cash equivalents, and marketable securities 848      
Cash and Cash Equivalents 0      
Marketable securities $ 848      
[1] The balances at December 31, 2011 and December 31, 2012 were 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.