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Debt - Term Loans Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 30, 2013
Nov. 07, 2012
Long-Term Debt Instrument [Line Items]      
Credit Facility Commitment Period five-year    
Unsecured Debt     $ 2,000,000,000
Net proceeds from issuance of unsecured loan 1,935,000,000    
Debt Instrument Margin Rate Range, Minimum   4.50%  
Base Rate Margin   0.50%  
Euro Rate Margin   1.00%  
Long-term Debt, Gross 12,620,000,000 12,736,000,000  
Term Loan [Member]
     
Long-Term Debt Instrument [Line Items]      
Debt Instrument Margin Rate Range, Minimum   3.50%  
Term Loan [Member] | Euro Rate Floor Percentage Per Annum [Member]
     
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.25%  
Term Loan [Member] | Base Rate Floor Percentage Per Annum [Member]
     
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.25%  
Term Loan [Member] | Maximum
     
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross   $ 125,000,000