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Borrowings - Schedule of Long-Term Debt (Details) - USD ($)
Oct. 31, 2020
Jul. 22, 2020
Jun. 30, 2020
Oct. 31, 2019
Debt Instrument [Line Items]        
Total $ 6,261,000,000      
Fair value adjustment related to hedged debt 2,000,000     $ 4,000,000
Unamortized debt issuance cost (37,000,000)   $ (26,000,000) (16,000,000)
Current portion of long-term debt (633,000,000)     (307,000,000)
Total long-term debt 5,543,000,000     4,780,000,000
U.S. Dollar Global Notes        
Debt Instrument [Line Items]        
Total 5,689,000,000     4,246,000,000
$1,350 issued at discount to par at a price of 99.827% in December 2010 at 3.75%, due December 2020        
Debt Instrument [Line Items]        
Total 0     648,000,000
Face amount of debt instrument $ 1,350,000,000      
Discount to par (percent) 99.827%      
Interest rate (percent) 3.75% 3.75% 3.75%  
$1,250 issued at discount to par at a price of 99.799% in May 2011 at 4.3%, due June 2021        
Debt Instrument [Line Items]        
Total $ 0     667,000,000
Face amount of debt instrument $ 1,250,000,000      
Discount to par (percent) 99.799%      
Interest rate (percent) 4.30% 4.30% 4.30%  
$1,000 issued at discount to par at a price of 99.816% in September 2011 at 4.375%, due September 2021        
Debt Instrument [Line Items]        
Total $ 412,000,000     538,000,000
Face amount of debt instrument $ 1,000,000,000      
Discount to par (percent) 99.816%      
Interest rate (percent) 4.375%   4.375%  
$1,500 issued at discount to par at a price of 99.707% in December 2011 at 4.65%, due December 2021        
Debt Instrument [Line Items]        
Total $ 586,000,000     695,000,000
Face amount of debt instrument $ 1,500,000,000      
Discount to par (percent) 99.707%      
Interest rate (percent) 4.65%   4.65%  
$500 issued at discount to par at a price of 99.771% in March 2012 at 4.05%, due September 2022        
Debt Instrument [Line Items]        
Total $ 499,000,000     499,000,000
Face amount of debt instrument $ 500,000,000      
Discount to par (percent) 99.771%      
Interest rate (percent) 4.05%      
$1,200 issued at discount to par at a price of 99.863% in September 2011 at 6.0%, due September 2041        
Debt Instrument [Line Items]        
Total $ 1,199,000,000     1,199,000,000
Face amount of debt instrument $ 1,200,000,000      
Discount to par (percent) 99.863%      
Interest rate (percent) 6.00%      
$1,150 issued at discount to par at a price of 99.769% in June 2020 at 2.2%, due June 2025        
Debt Instrument [Line Items]        
Total $ 1,148,000,000     0
Face amount of debt instrument $ 1,150,000,000   $ 1,150,000,000  
Discount to par (percent) 99.769%      
Interest rate (percent) 2.20%   2.20%  
$1,000 issued at discount to par at a price of 99.718% in June 2020 at 3.0%, due June 2027        
Debt Instrument [Line Items]        
Total $ 997,000,000     0
Face amount of debt instrument $ 1,000,000,000   $ 1,000,000,000.0  
Discount to par (percent) 99.718%      
Interest rate (percent) 3.00%   3.00%  
$850 issued at discount to par at a price of 99.790% in June 2020 at 3.4%, due June 2030        
Debt Instrument [Line Items]        
Total $ 848,000,000     0
Face amount of debt instrument $ 850,000,000   $ 850,000,000  
Discount to par (percent) 99.79%      
Interest rate (percent) 3.40%   3.40%  
Other borrowings at 0.51%-9.00%, due in fiscal years 2021-2027        
Debt Instrument [Line Items]        
Other borrowings at 0.51%-9.00%, due in fiscal years 2021-2027 $ 522,000,000     $ 853,000,000
Minimum | Other borrowings at 0.51%-9.00%, due in fiscal years 2021-2027        
Debt Instrument [Line Items]        
Interest rate (percent) 0.51%      
Maximum | Other borrowings at 0.51%-9.00%, due in fiscal years 2021-2027        
Debt Instrument [Line Items]        
Interest rate (percent) 9.00%