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Debt and Derivatives - Borrowings and Repayments (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jul. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Debt      
Debt repayments   $ 10,619 $ 16,991
Net proceeds   10,914 $ 17,319
Commercial Paper Program [Member]      
Debt      
Commercial paper repayments   10,300  
Commercial paper borrowings   9,400  
Net proceeds $ 1,500    
4.950% senior notes due 2027 and 2031 [Member]      
Debt      
Net proceeds   $ 1,500  
4.950% senior notes due 2027 [Member]      
Debt      
Interest rate (as a percent)   4.95%  
Debt instrument face amount   $ 750  
4.950% senior notes due 2031 [Member]      
Debt      
Interest rate (as a percent)   4.95%  
Debt instrument face amount   $ 750  
3.50% senior notes due 2024 [Member]      
Debt      
Interest rate (as a percent)   3.50%  
Debt repayments   $ 156