v3.26.1
Securitizations and Variable Interest Entities, Consolidated VIEs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Variable Interest Entity [Line Items]      
Trading assets $ 221,711 $ 227,935  
Total loans 1,016,787 986,167 $ 913,842
Long-term debt (183,941) (174,712)  
Accrued expenses and other liabilities $ (66,259) $ (68,196)  
Securitizations and Variable Interest Entities Textual [Abstract]      
Variable interest entity, creditor or beneficial interest holder, lack of recourse [true false] true true  
VIEs that we consolidate [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets $ 13,421 $ 13,935  
VIEs that we consolidate [Member] | Credit card securitizations [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 9,468 9,860  
Securitizations and Variable Interest Entities Textual [Abstract]      
Transferor's interests in transferred financial assets, fair value $ 3,900 $ 4,300  
VIEs that we consolidate [Member] | Credit card securitizations [Member] | Minimum [Member]      
Securitizations and Variable Interest Entities Textual [Abstract]      
Seller's interest percent 5.00% 5.00%  
VIEs that we consolidate [Member] | Credit card securitizations [Member] | Subordinated securities [Member]      
Securitizations and Variable Interest Entities Textual [Abstract]      
Transferor's interests in transferred financial assets, fair value $ 1,500 $ 1,500  
VIEs that we consolidate [Member] | Corporate loan structures [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 2,169 2,307  
VIEs that we consolidate [Member] | Commercial financing structures [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 1,784 1,768  
VIEs that we consolidate [Member] | Carrying value [Member]      
Variable Interest Entity [Line Items]      
Trading assets 2,128 2,271  
Total loans 10,937 11,282  
All other assets 208 224  
Long-term debt (3,753) (3,775)  
Accrued expenses and other liabilities (202) (206)  
VIEs that we consolidate [Member] | Carrying value [Member] | Credit card securitizations [Member]      
Variable Interest Entity [Line Items]      
Trading assets 0 0  
Total loans 9,274 9,653  
All other assets 50 50  
Long-term debt (3,753) (3,775)  
Accrued expenses and other liabilities (7) (7)  
VIEs that we consolidate [Member] | Carrying value [Member] | Corporate loan structures [Member]      
Variable Interest Entity [Line Items]      
Trading assets 2,128 2,271  
Total loans 0 0  
All other assets 37 36  
Long-term debt 0 0  
Accrued expenses and other liabilities (7) (6)  
VIEs that we consolidate [Member] | Carrying value [Member] | Commercial financing structures [Member]      
Variable Interest Entity [Line Items]      
Trading assets 0 0  
Total loans 1,663 1,629  
All other assets 121 138  
Long-term debt 0 0  
Accrued expenses and other liabilities $ (188) $ (193)