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Borrowings (narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2018
May 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2018
Debt Instrument [Line Items]            
Weighted average interest rate (in percentage)     2.36%      
Line of credit facility, remaining borrowing capacity     $ 6,170,000,000      
Line of credit facility, outstanding     25,900,000 $ 6,000,000    
Proceeds from issuance of long-term debt     $ 2,477,700,000 $ 2,232,000,000 $ 1,206,600,000  
Proceeds from issuance of secured debt   $ 2,230,000,000        
Description of derivative activity volume percent     20.00%      
Debt instrument, interest rate, effective percentage (in percentage)     3.36% 2.65%    
Cash payments for interest on borrowings     $ 223,800,000 $ 192,700,000 $ 146,400,000  
Notes Due in May 2022            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 750,000,000        
Stated interest rate (in percentage)   2.35%        
Notes Due in May 2027            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 750,000,000        
Stated interest rate (in percentage)   3.10%        
Notes Due in 2047            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 750,000,000        
Stated interest rate (in percentage)   3.95%        
Minimum            
Debt Instrument [Line Items]            
Stated interest rate (in percentage)     0.15%      
Maximum            
Debt Instrument [Line Items]            
Stated interest rate (in percentage)     7.13%      
Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 2,000,000,000
Senior Notes | Senior Notes Due August 27, 2021            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 500,000,000
Stated interest rate (in percentage)           3.91%
Senior Notes | Senior Notes Due August 28, 2023            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 750,000,000
Stated interest rate (in percentage)           4.27%
Senior Notes | Senior Notes Due August 28, 2028            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 750,000,000
Stated interest rate (in percentage)           4.90%
Secured Debt | Term Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 500,000,000          
Debt instrument, term (in years) 3 years          
Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 750,000,000          
Debt instrument, term (in years) 5 years          
Borrowings outstanding     $ 0      
Maturity Date, 2023            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     3,000,000,000      
Maturity Date, 2019            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     $ 2,000,000,000