v3.26.1
Debt - Summary of Outstanding Debt Net of Discounts and Fees, Weighted Average Contractual Interest Rates and Range of Contractual Interest Rates (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Debt Instrument [Line Items]    
Unsecured debt $ 50,276 $ 49,444
Secured debt 14,908 15,344
Total debt $ 65,184 $ 64,788
Short-Term Debt    
Debt Instrument [Line Items]    
Weighted average contractual interest rate (percentage) 3.83% 3.77%
Commercial paper    
Debt Instrument [Line Items]    
Unsecured debt $ 5,638 $ 2,929
Weighted average contractual interest rate (percentage) 3.83% 3.64%
Bank loans    
Debt Instrument [Line Items]    
Unsecured debt $ 2,355 $ 2,382
Weighted average contractual interest rate (percentage) 3.73% 3.73%
Public MTN Program    
Debt Instrument [Line Items]    
Unsecured debt $ 39,084 $ 40,726
Weighted average contractual interest rate (percentage) 4.01% 3.91%
Other debt    
Debt Instrument [Line Items]    
Unsecured debt $ 3,199 $ 3,407
Weighted average contractual interest rate (percentage) 3.76% 3.74%
Secured debt    
Debt Instrument [Line Items]    
Secured debt $ 14,908 $ 15,344
Weighted average contractual interest rate (percentage) 4.29% 4.33%