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Debt and Derivative Instruments - Narrative (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Jan. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
tranche
Jan. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Number of tranches | tranche     3  
Debt instrument, face amount   $ 36,400,000,000    
Debt instrument, redemption price, percentage   100.00%    
Debt instrument, change of control, redemption price, percent   101.00%    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity of credit facility   $ 3,000,000,000    
5-year Back-up Credit Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity of credit facility   $ 2,000,000,000    
Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 3,000,000,000
Senior Notes | Senior Notes Due September 2028, 1.50%, First Tranche        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 1,000,000,000  
Debt instrument, interest rate, stated percentage     1.50%  
Unamortized discount     $ 4,000,000  
Senior Notes | Senior Notes Due September 2031, 1.875%, Second Tranche        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 1,000,000,000  
Debt instrument, interest rate, stated percentage     1.875%  
Unamortized discount     $ 6,000,000  
Senior Notes | Senior Notes Due September 2051, 2.75%, Third Tranche        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 1,000,000,000  
Debt instrument, interest rate, stated percentage     2.75%  
Unamortized discount     $ 11,000,000  
Senior Notes | September 2021 Issuance        
Debt Instrument [Line Items]        
Debt issuance costs     $ 17,000,000  
Senior Notes | 3.25% Senior notes due March 2022        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   3.25%    
Senior Notes | 5.875% Senior notes due December 2036        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   5.875%    
Senior Notes | 2.00% Senior notes due April 2021        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 2.00%      
Repayments of debt $ 1,350,000,000