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FINANCIAL INSTRUMENTS (Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost $ 5,797 $ 4,916            
Marketable Securities, Unrealized Gain in Accumulated OCI 75 45            
Marketable Securities, Unrealized Loss in Accumulated OCI (6) (12)            
Marketable Securities, Fair Value 5,866 4,949 6,541 6,739 6,453 3,340 4,331 4,638
Cash Equivalents, Fair Value 5,469 4,332            
Cash and cash equivalents maintained in foreign currencies 508              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair value at January 1 598 585            
Settlements (52) (69)            
Unrealized gains/(losses) (66) 36            
Fair value at December 31 566 598            
Current Marketable Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 2,957 2,268            
Noncurrent Marketable Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 2,909 2,681            
Certificates of Deposit [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 1,051 1,209            
Marketable Securities, Fair Value 1,051 1,209            
Corporate Debt Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 2,908 1,996            
Marketable Securities, Unrealized Gain in Accumulated OCI 60 26            
Marketable Securities, Unrealized Loss in Accumulated OCI (3) (10)            
Marketable Securities, Fair Value 2,965 2,012            
Commercial Paper [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 1,035 482            
Marketable Securities, Fair Value 1,035 482            
FDIC insured debt securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 302 353            
Marketable Securities, Unrealized Gain in Accumulated OCI 1 3            
Marketable Securities, Fair Value 303 356            
U.S. Treasury Bills [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 400 400            
Marketable Securities, Unrealized Gain in Accumulated OCI 2 4            
Marketable Securities, Fair Value 402 404            
U.S. Government Agency Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost   375            
Marketable Securities, Unrealized Gain in Accumulated OCI   1            
Marketable Securities, Fair Value   376            
Auction Rate Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 80 80            
Marketable Securities, Unrealized Gain in Accumulated OCI 12 11            
Marketable Securities, Fair Value 92 91            
Available For Sale Securities Maturities After Ten Years, Fair Value 92              
Floating Rate Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Amortized Cost 21 21            
Marketable Securities, Unrealized Loss in Accumulated OCI (3) (2)            
Marketable Securities, Fair Value 18 19            
Corporate Debt Securities Treasury Bills Federal Deposit Insurance Corporation Debt Securities And Floating Rate Securities [Member]
               
Marketable Securities [Line Items]                
Available For Sale Securities Maturities After One Through Five Years, Fair Value 2,817              
Fair Value Level 1 [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 402 780            
Fair Value Level 1 [Member] | U.S. Treasury Bills [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 402 404            
Fair Value Level 1 [Member] | U.S. Government Agency Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value   376            
Fair Value Level 2 [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 5,354 4,059            
Fair Value Level 2 [Member] | Certificates of Deposit [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 1,051 1,209            
Fair Value Level 2 [Member] | Corporate Debt Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 2,965 2,012            
Fair Value Level 2 [Member] | Commercial Paper [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 1,035 482            
Fair Value Level 2 [Member] | FDIC insured debt securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 303 356            
Fair Value Level 3 [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 110 110            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Settlements   (93)            
Unrealized gains/(losses)   24            
Fair value at December 31   179            
Fair Value Level 3 [Member] | Auction Rate Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value 92 91            
Fair Value Level 3 [Member] | Floating Rate Securities [Member]
               
Marketable Securities [Line Items]                
Marketable Securities, Fair Value $ 18 $ 19