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Debt and Borrowing Arrangements - Debt Repayments (Details)
SFr in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Amount $ 3,878   $ 2,677 $ 1,821
Loans Payable | 0.625% Swiss Franc Notes Due October 2020        
Debt Instrument [Line Items]        
Interest Rate 0.625% 0.625%    
Amount $ 147 SFr 135    
Loans Payable | Variable Notes Due September 2020        
Debt Instrument [Line Items]        
Amount [1] $ 750      
Loans Payable | 3.000% Notes Due May 2020        
Debt Instrument [Line Items]        
Interest Rate 3.00% 3.00%    
Amount $ 750      
Loans Payable | 0.050% Swiss Franc Notes Due March 2020        
Debt Instrument [Line Items]        
Interest Rate 0.05% 0.05%    
Amount $ 234 SFr 225    
Loans Payable | 5.375% Notes Due February 2020        
Debt Instrument [Line Items]        
Interest Rate 5.375% 5.375%    
Amount $ 427      
Loans Payable | 1.625% Notes Due October 2019        
Debt Instrument [Line Items]        
Interest Rate     1.625%  
Amount     $ 1,750  
Loans Payable | Variable Notes Due October 2019        
Debt Instrument [Line Items]        
Amount     500  
Loans Payable | Variable Notes Due February 2019        
Debt Instrument [Line Items]        
Amount     $ 400  
[1] We repaid the $750 million term loan early with proceeds from the issuance of notes.