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Borrowings (narrative) (Details)
€ in Millions, SFr in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2016
CHF (SFr)
Jun. 30, 2015
EUR (€)
Mar. 31, 2015
USD ($)
Debt Instrument [Line Items]                
Weighted average interest rate (in percentage)     1.34%          
Line of credit facility, remaining borrowing capacity     $ 5,570,000,000          
Line of credit facility, outstanding     6,000,000 $ 0        
Proceeds from issuance of long-term debt     2,232,000,000 1,206,600,000 $ 4,454,700,000      
Repayments of long-term debt   $ 1,950,000,000 630,600,000 200,000 1,955,700,000      
Extinguishment of debt   1,650,000,000            
Debt extinguishment loss (Note 10)     $ 0 $ 0 166,700,000      
Proceeds from issuance of secured debt $ 2,230,000,000              
Description of derivative activity volume percent     28.00%          
Debt instrument, interest rate, effective percentage (in percentage)     2.65% 2.51%        
Cash payments for interest on borrowings     $ 192,700,000 $ 146,400,000 $ 129,600,000      
Maturity Date, 2021                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     1,200,000,000          
Maturity Date, 2017                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     3,800,000,000          
Maturity Date, 2018                
Debt Instrument [Line Items]                
Debt instrument, face amount           SFr 200.0   $ 600,000,000
Stated interest rate (in percentage)           0.00%   1.25%
Maturity Date, 2024                
Debt Instrument [Line Items]                
Debt instrument, face amount | SFr           SFr 600.0    
Stated interest rate (in percentage)           0.15%    
Maturity Date, 2028                
Debt Instrument [Line Items]                
Debt instrument, face amount | SFr           SFr 400.0    
Stated interest rate (in percentage)           0.45%    
Swiss Franc-Denominated Debt Issuance                
Debt Instrument [Line Items]                
Proceeds from issuance of long-term debt     1,210,000,000          
Maturity Date, 2025                
Debt Instrument [Line Items]                
Debt instrument, face amount               $ 800,000,000
Stated interest rate (in percentage)               2.75%
Maturity Date, 2045                
Debt Instrument [Line Items]                
Debt instrument, face amount               $ 800,000,000
Stated interest rate (in percentage)               3.70%
Maturity Date, 2022                
Debt Instrument [Line Items]                
Debt instrument, face amount | €             € 600.0  
Stated interest rate (in percentage)             1.00%  
Maturity Date, 2026                
Debt Instrument [Line Items]                
Debt instrument, face amount | €             € 750.0  
Stated interest rate (in percentage)             1.63%  
Maturity Date, 2030                
Debt Instrument [Line Items]                
Debt instrument, face amount | €             € 750.0  
Stated interest rate (in percentage)             2.13%  
Euro-Denominated Debt Issuance                
Debt Instrument [Line Items]                
Proceeds from issuance of long-term debt   2,270,000,000            
Carrying Amount                
Debt Instrument [Line Items]                
Long-term debt     $ 10,950,300,000 $ 9,005,900,000        
Extinguishment of debt   $ 1,780,000,000            
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)     0.00%          
Maximum                
Debt Instrument [Line Items]                
Stated interest rate (in percentage)     7.13%