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Marketable Securities And Cash Equivalents (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost of marketable securities and cash equivalents $ 2,250 $ 2,340
Unrealized gains on marketable securities and cash equivalents 11 3
Unrealized losses on marketable securities and cash equivalents (10) (5)
Fair value of marketable securities and cash equivalents 2,251 2,338
United States Government Obligations [Member] | Maturity Less Than 1 Year [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 329 583
Unrealized gains on available for sale securities 0 0
Unrealized losses on available for sale securities 0 0
Fair Value 329 583
United States Government Obligations [Member] | Maturity 1 To 5 Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 161 93
Unrealized gains on available for sale securities 0 0
Unrealized losses on available for sale securities 0 0
Fair Value 161 93
Government-Sponsored Enterprise Obligations [Member] | Maturity 1 To 5 Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 2 2
Unrealized gains on available for sale securities 0 0
Unrealized losses on available for sale securities 0 0
Fair Value 2 2
Corporate Debt Securities [Member] | Maturity Less Than 1 Year [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 1  
Unrealized gains on available for sale securities 0  
Unrealized losses on available for sale securities 0  
Fair Value 1  
Corporate Debt Securities [Member] | Maturity 1 To 5 Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 13 15
Unrealized gains on available for sale securities 0 0
Unrealized losses on available for sale securities 0 0
Fair Value 13 15
Other Debt Securities [Member] | Maturity Less Than 1 Year [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 1,201 1,038
Unrealized gains on available for sale securities 0 0
Unrealized losses on available for sale securities 0 0
Fair Value 1,201 1,038
Other Debt Securities [Member] | Maturity 1 To 5 Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 3 3
Unrealized gains on available for sale securities 0 0
Unrealized losses on available for sale securities 0 0
Fair Value 3 3
Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 540 606
Unrealized gains on available for sale securities 11 3
Unrealized losses on available for sale securities (10) (5)
Fair Value $ 541 $ 604