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Borrowings - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]    
Other short-term borrowings $ 8,472 $ 5,999
Weighted-average interest rate of short-term borrowings 4.49% 5.21%
Capacity of allowable commercial paper note issuance $ 5,000  
Commercial paper 2,000 $ 0
Discounts on commercial paper 19  
Secured Uncommitted Lines Of Credit    
Line of Credit Facility [Line Items]    
Other short-term borrowings $ 500 500
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 29,900 30,500
Repurchase Agreements    
Line of Credit Facility [Line Items]    
Other short-term borrowings 6,000 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 500 500
Federal Home Loan Bank Advances | Secured Credit Facility    
Line of Credit Facility [Line Items]    
Borrowings outstanding $ 9,000 $ 16,700
Weighted average interest rate 4.40% 5.11%
Total borrowing capacity $ 67,300 $ 59,800