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Debt - Senior Unsecured Notes (Details) - USD ($)
May 01, 2017
Nov. 30, 2016
Sep. 15, 2016
Feb. 01, 2016
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument            
Total debt before discount, net         $ 7,445,960,000  
Senior unsecured notes         6,889,045,000 $ 7,133,538,000
Unsecured Debt            
Debt Instrument            
Total debt before discount, net         6,950,000,000  
Senior unsecured notes         $ 0 $ 0
Unsecured Note 3.75%            
Debt Instrument            
Repayment of senior unsecured notes       $ 500,000,000    
Percentage of stated interest rate       3.75%    
Unsecured Note 6.3%            
Debt Instrument            
Repayment of senior unsecured notes     $ 400,000,000      
Percentage of stated interest rate     6.30%      
Unsecured Note 6.0%            
Debt Instrument            
Repayment of senior unsecured notes   $ 500,000,000        
Percentage of stated interest rate   6.00%        
Unsecured Note 6.7%            
Debt Instrument            
Repayment of senior unsecured notes   $ 600,000,000        
Percentage of stated interest rate   6.70%        
Unsecured Note 5.625%            
Debt Instrument            
Repayment of senior unsecured notes $ 250,000,000          
Percentage of stated interest rate 5.625%