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Borrowings - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]    
Other short-term borrowings $ 6,541 $ 5,999
Weighted-average interest rate of short-term borrowings 4.48% 5.21%
Capacity of allowable commercial paper note issuance $ 5,000  
Commercial paper 800 $ 0
Discounts on commercial paper 4  
Secured Uncommitted Lines Of Credit    
Line of Credit Facility [Line Items]    
Other short-term borrowings $ 1,750 500
Commercial paper | Maximum    
Line of Credit Facility [Line Items]    
Maturity term 270 days  
Federal Reserve Bank Advances    
Line of Credit Facility [Line Items]    
Other short-term borrowings $ 0 0
Total borrowing capacity 29,700 30,500
Repurchase Agreements    
Line of Credit Facility [Line Items]    
Other short-term borrowings 4,000 5,500
Line of Credit | Uncommitted Lines Of Credit With External Banks    
Line of Credit Facility [Line Items]    
Other short-term borrowings 0 0
Total borrowing capacity 1,700  
Line of Credit | Secured Uncommitted Lines Of Credit    
Line of Credit Facility [Line Items]    
Other short-term borrowings 1,800 500
Federal Home Loan Bank Advances | Secured Credit Facility    
Line of Credit Facility [Line Items]    
Borrowings outstanding $ 850 $ 16,700
Weighted average interest rate 4.11% 5.11%
Total borrowing capacity $ 75,300 $ 59,800