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Debt Debt Issuances (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term Debt, Excluding Current Maturities $ 7,816,000,000 $ 4,820,000,000
Debt Instrument, Call Feature We may redeem some or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.  
August 2013 Debt Issuances [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Excluding Current Maturities 3,000,000,000  
Number of Tranches 4  
Senior notes due August 2016 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Month And Year August 2016  
Long-term Debt, Excluding Current Maturities 600,000,000  
Debt Instrument, Interest Rate, Stated Percentage 1.00%  
Senior notes due August 2018 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Month And Year August 2018  
Long-term Debt, Excluding Current Maturities 400,000,000  
Debt Instrument, Interest Rate, Stated Percentage 2.00%  
Senior notes due August 2023 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Month And Year August 2023  
Long-term Debt, Excluding Current Maturities 1,100,000,000  
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Senior notes due August 2043 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Month And Year August 2043  
Long-term Debt, Excluding Current Maturities $ 900,000,000  
Debt Instrument, Interest Rate, Stated Percentage 4.75%