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Debt And Financing Arrangements (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended
Oct. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Debt And Financing Arrangements [Line Items]      
Debt face amount exchanged for new debentures $ 568,000,000    
Debt premium 196,000,000   32,000,000
Charges from early extinguishment of debt     12,000,000
Excess of fair value over carrying value of long-term debt   1,600,000,000  
Maximum amount provided under accounts receivable securitization facility excluded in lines of credit   1,000,000,000  
Amount utilized from the securitization facility   1,000,000,000  
5.935% Debentures $500 Million Face Amount, Due In 2032 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 5.935%    
6.45% Debentures $158 Million Face Amount, Due In 2038 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 6.45%    
6.625% Debentures $197 Million Face Amount, Due In 2029 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 6.625%    
6.75% Debentures $141 Million Face Amount, Due In 2027 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 6.75%    
6.95% Debentures $176 Million Face Amount, Due In 2097 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 6.95%    
7.0% Debentures $194 Million Face Amount, Due In 2031 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 7.00%    
7.5% Debentures $222 Million Face Amount, Due In 2027 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 7.50%    
0.875% Convertible Senior Notes $1.15 Billion Face Amount, Due In 2014 [Member]
     
Debt And Financing Arrangements [Line Items]      
Debt instrument face amount   1,150,000,000  
Debt instrument, maturity year   2014  
5.765% Debentures $1.0 Billion Face Amount, Due In 2041 [Member]
     
Debt And Financing Arrangements [Line Items]      
Interest rate stated percentage 5.765%    
4.016% Debentures $570 Face Amount, Due 2043 [Member]
     
Debt And Financing Arrangements [Line Items]      
Debt instrument face amount 570,000,000    
Interest rate stated percentage 4.016%    
Debt instrument, maturity year 2043    
Lines of credit [Member]
     
Debt And Financing Arrangements [Line Items]      
Lines of credit   8,600,000,000  
Unused lines of credit   5,300,000,000  
Commercial Paper [Member]
     
Debt And Financing Arrangements [Line Items]      
Lines of credit   6,300,000,000  
Borrowing under commercial paper borrowing facility   $ 2,400,000,000