XML 45 R50.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]      
Stock purchase price, percentage of quarter closing stock market price 85.00%    
Maximum percentage of wages withheld for stock purchase 10.00%    
Ownership percentage, minimum threshold for equity method accounting 20.00%    
Ownership percentage, maximum threshold for equity method accounting 50.00%    
Minimum voting securities owned 20.00%    
Research and development costs $ 563 $ 491 $ 465
Interest costs capitalized as part of property $ 46 $ 20 $ 29
Finite-lived intangible assets, useful life, years minimum 4    
Finite-lived intangible assets, useful life, years maximum 50