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Long-Term Debt (Details) (USD $)
1 Months Ended
Apr. 30, 2013
Apr. 02, 2013
2.70% Senior Notes due April 1, 2023 [Member]
   
Debt Instrument [Line Items]    
Debt instrument, face amount   $ 1,000,000,000
Stated interest rate percentage   2.70%
Debt instrument, unamortized discount   2,000,000
Debt instrument, maturity date Apr. 01, 2023  
4.20% Senior Notes due April 1, 2043 [Member]
   
Debt Instrument [Line Items]    
Debt instrument, face amount   1,000,000,000
Stated interest rate percentage   4.20%
Debt instrument, unamortized discount   4,000,000
Debt instrument, maturity date Apr. 01, 2043  
April 2013 Issuance [Member]
   
Debt Instrument [Line Items]    
Debt instrument, unamortized discount   6,000,000
Debt issuance cost 15,000,000  
Debt instrument, frequency of periodic payment semi-annually on April 1 and October 1  
Long-term debt, redemption price 100.00%  
Debt instrument, change of control, redemption price, percent 101.00%