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LONG-TERM DEBT - Senior Notes (Details) - USD ($)
$ in Millions
Sep. 05, 2019
Sep. 15, 2016
Jun. 18, 2013
Sep. 10, 2012
Jul. 13, 2010
Oct. 31, 2019
Aug. 01, 2019
Oct. 31, 2018
Jul. 01, 2012
Aug. 09, 2011
Debt Instrument [Line Items]                    
Debt Instrument Net Discount Premium Amount           $ 1,786   $ 1,792    
Senior Notes 2020 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Net Discount Premium Amount               499    
Issuance date of debt         Jul. 13, 2010          
Aggregate face amount of debt         $ 500         $ 500
Issue rate percentage of principal amount         99.54%          
Maturity date         Jul. 15, 2020          
Fixed interest rate per annum (in hundredths)         5.00%          
Senior Notes 2022 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Net Discount Premium Amount           399   399    
Issuance date of debt       Sep. 10, 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]                    
Debt Instrument Net Discount Premium Amount           597   597    
Issuance date of debt     Jun. 18, 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 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Net Discount Premium Amount           298   297    
Issuance date of debt   Sep. 15, 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 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Net Discount Premium Amount           492   $ 0    
Issuance date of debt Sep. 05, 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                  
Treasury Lock [Member] | Senior Notes 2029 [Member]                    
Debt Instrument [Line Items]                    
Derivative, Notional Amount             $ 250      
Remaining gain loss to be amortized on derivative           6        
Treasury Lock [Member] | Senior Notes 2022 [Member]                    
Debt Instrument [Line Items]                    
Derivative, Notional Amount                 $ 400  
Remaining gain loss to be amortized on derivative           $ 1