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Income Taxes (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Jun. 30, 2010
Sep. 30, 2010
Income Taxes (Textuals)              
Annual effective tax rate before discrete period items 19.00% 18.00%     19.00% 18.00%  
Potential valuation allowance adjustment         $ 50    
Total valuation allowance adjustment   (13)   (69)      
Amount of reduction in the period in cumulative translation adjustments related to the change in the valuation allowance for a specified deferred tax asset       24      
Valuation allowance adjustment recorded as income tax expense   (13)   (93)   (106)  
Gross tax effected unrecognized tax benefits             1,262
Amount of unrecognized tax benefits which may impact effective tax rate             1,063
Total net accrued interest, net of tax benefit             68
Net change in interest and penalties         27 52  
Interest and penalties included in change in uncertain tax positions       26   26  
Interest expense on existing uncertain tax positions           26  
Uncertain tax positions   (38)   31   (7)  
Number of months estimated for conclusion period for tax examinations, appellate proceedings and/or tax litigation         12 months    
Potential adjustment to tax expense due to the conclusion of tax examinations, appellate proceedings and/or tax litigation within the next 12 months 100       100    
Medicare Part D     $ 18     $ 18  
IRS Appeals [Member]
             
Income Taxes (Textuals)              
Fiscal years currently under exam by the Internal Revenue Service (IRS)         2004-2006    
Internal Revenue Service (IRS) [Member]
             
Income Taxes (Textuals)              
Fiscal years currently under exam by the Internal Revenue Service (IRS)         2007-2009