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LONG-TERM DEBT - Senior Notes (Details) - USD ($)
$ in Millions
Jun. 04, 2020
Sep. 16, 2019
Sep. 22, 2016
Jun. 21, 2013
Sep. 13, 2012
Oct. 31, 2020
Aug. 01, 2019
Sep. 15, 2016
Feb. 01, 2016
Jul. 01, 2012
Senior Notes 2022                    
Debt Instrument [Line Items]                    
Issuance date of debt         Sep. 13, 2012          
Aggregate face amount of debt         $ 400          
Issue rate percentage of principal amount         99.80%          
Maturity date         Oct. 01, 2022          
Fixed interest rate per annum (in hundredths)         3.20%          
Interest payment frequency         semi-annually          
Date payments commenced         Apr. 01, 2013          
Senior Notes 2023 [Member]                    
Debt Instrument [Line Items]                    
Issuance date of debt       Jun. 21, 2013            
Aggregate face amount of debt       $ 600            
Issue rate percentage of principal amount       99.544%            
Maturity date       Jul. 15, 2023            
Fixed interest rate per annum (in hundredths)       3.875%            
Interest payment frequency       semi-annually            
Date payments commenced       Jan. 15, 2014            
Senior Notes 2026                    
Debt Instrument [Line Items]                    
Issuance date of debt     Sep. 22, 2016              
Aggregate face amount of debt     $ 300              
Issue rate percentage of principal amount     99.624%              
Maturity date     Sep. 22, 2026              
Fixed interest rate per annum (in hundredths)     3.05%              
Interest payment frequency     semi-annually              
Date payments commenced     Mar. 22, 2017              
Senior Notes 2029                    
Debt Instrument [Line Items]                    
Issuance date of debt   Sep. 16, 2019                
Aggregate face amount of debt   $ 500                
Issue rate percentage of principal amount   99.316%                
Maturity date   Sep. 15, 2029                
Fixed interest rate per annum (in hundredths)   2.75%                
Interest payment frequency   semi-annually                
Date payments commenced   Mar. 15, 2020                
Senior Notes 2030 [Member]                    
Debt Instrument [Line Items]                    
Issuance date of debt Jun. 04, 2020                  
Aggregate face amount of debt $ 500                  
Issue rate percentage of principal amount 99.812%                  
Maturity date Jun. 04, 2030                  
Fixed interest rate per annum (in hundredths) 2.10%                  
Interest payment frequency semi-annually                  
Date payments commenced Dec. 04, 2020                  
Treasury Lock | Senior Notes 2029                    
Debt Instrument [Line Items]                    
Derivative, Notional Amount             $ 250      
Remaining gain loss to be amortized on derivative           $ 5        
Treasury Lock | Senior Notes 2022                    
Debt Instrument [Line Items]                    
Derivative, Notional Amount                   $ 400
Remaining gain loss to be amortized on derivative           1        
Treasury Lock | Senior Notes 2026 | Cash Flow Hedges                    
Debt Instrument [Line Items]                    
Derivative, Notional Amount                 $ 300  
Remaining gain loss to be amortized on derivative           $ 6        
Interest Rate Swap                 $ 300  
Notional Amount Of Terminated Interest Rate Fair Value Hedge Derivatives               $ 10