v3.26.1
Unsecured Borrowings - Unsecured Short-Term Borrowings (Detail) - USD ($)
Mar. 31, 2026
Dec. 31, 2025
Short-Term Debt [Line Items]    
Unsecured short-term borrowings $ 33,130,000,000 $ 30,520,000,000
Weighted average interest rate 4.73% 4.34%
Commercial Paper    
Short-Term Debt [Line Items]    
Unsecured short-term borrowings $ 1,000,000,000.00 $ 0