v3.26.1
Borrowings - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Line of Credit Facility [Line Items]      
Other finance liabilities $ 22,965 $ 22,965  
Other short-term borrowings $ 13,945 $ 13,945 $ 6,913
Weighted-average interest rate of short-term borrowings 3.25% 3.25% 4.09%
Secured Uncommitted Lines Of Credit      
Line of Credit Facility [Line Items]      
Other short-term borrowings $ 2,300 $ 2,300 $ 3,800
CSC Commercial Paper Notes | 5.0 Billion Commercial Paper Notes      
Line of Credit Facility [Line Items]      
Capacity of allowable commercial paper note issuance 5,000 $ 5,000  
Maturity term   270 days  
Commercial paper 2,500 $ 2,500 1,900
Discounts on commercial paper 16 16 32
CS & Co Unsecured Commercial Paper Notes | 10.0 Billion Commercial Paper Notes | Charles Schwab & Co., Inc.      
Line of Credit Facility [Line Items]      
Other short-term borrowings 4,900 4,900  
Capacity of allowable commercial paper note issuance 10,000 $ 10,000  
Maturity term   270 days  
Discounts on commercial paper 48 $ 48  
Federal Reserve Bank Advances      
Line of Credit Facility [Line Items]      
Other short-term borrowings 0 0 0
Total borrowing capacity 28,000 28,000 29,300
Repurchase Agreements      
Line of Credit Facility [Line Items]      
Other short-term borrowings 4,300 4,300 1,300
Line of Credit | Uncommitted Lines Of Credit With External Banks      
Line of Credit Facility [Line Items]      
Other short-term borrowings 0 0 0
Total borrowing capacity 1,900 1,900  
Line of Credit | Secured Uncommitted Lines Of Credit      
Line of Credit Facility [Line Items]      
Other short-term borrowings 2,300 2,300 3,800
Software License Agreement | Third-Party Long Term Software Licensing Agreement      
Line of Credit Facility [Line Items]      
Other finance liabilities 633 633  
Initial debt payment 49    
Federal Home Loan Bank Advances | Secured Credit Facility      
Line of Credit Facility [Line Items]      
Borrowings outstanding $ 500 $ 500 $ 1,900
Weighted average interest rate 3.79% 3.79% 3.90%
Total borrowing capacity $ 32,800 $ 32,800 $ 74,200