v3.26.1
Securitizations and Variable Interest Entities, Consolidated VIEs (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Variable Interest Entity [Line Items]      
Trading assets $ 243,168 $ 227,935  
Available-for-sale debt securities, at fair value 250,326 213,573  
Total loans 1,031,115 986,167 $ 924,418
Short-Term Debt (25,168) (18,323)  
Accrued expenses and other liabilities (82,731) (68,196)  
Long-term debt $ (182,139) $ (174,712)  
Securitizations and Variable Interest Entities Textual [Abstract]      
Variable interest entity, creditor or beneficial interest holder, lack of recourse [true false] true true  
Carrying value [Member]      
Variable Interest Entity [Line Items]      
Short-Term Debt $ (25,132) $ (18,323)  
VIEs that we consolidate [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 14,767 13,935  
VIEs that we consolidate [Member] | Credit card securitizations [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 9,511 9,860  
Securitizations and Variable Interest Entities Textual [Abstract]      
Transferor's interests in transferred financial assets, fair value $ 2,700 $ 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 2,735 2,307  
VIEs that we consolidate [Member] | Commercial financing structures [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 1,753 1,768  
VIEs that we consolidate [Member] | Municipal tender option bond (MTOB) [Member]      
Variable Interest Entity [Line Items]      
Total VIE assets 768 0  
VIEs that we consolidate [Member] | Carrying value [Member]      
Variable Interest Entity [Line Items]      
Trading assets 2,688 2,271  
Available-for-sale debt securities, at fair value 763 0  
Total loans 10,916 11,282  
All other assets 249 224  
Short-Term Debt (711) 0  
Accrued expenses and other liabilities (228) (206)  
Long-term debt (4,972) (3,775)  
VIEs that we consolidate [Member] | Carrying value [Member] | Credit card securitizations [Member]      
Variable Interest Entity [Line Items]      
Trading assets 0 0  
Available-for-sale debt securities, at fair value 0 0  
Total loans 9,300 9,653  
All other assets 63 50  
Short-Term Debt 0 0  
Accrued expenses and other liabilities (10) (7)  
Long-term debt (4,972) (3,775)  
VIEs that we consolidate [Member] | Carrying value [Member] | Corporate loan structures [Member]      
Variable Interest Entity [Line Items]      
Trading assets 2,688 2,271  
Available-for-sale debt securities, at fair value 0 0  
Total loans 0 0  
All other assets 44 36  
Short-Term Debt 0 0  
Accrued expenses and other liabilities (8) (6)  
Long-term debt 0 0  
VIEs that we consolidate [Member] | Carrying value [Member] | Commercial financing structures [Member]      
Variable Interest Entity [Line Items]      
Trading assets 0 0  
Available-for-sale debt securities, at fair value 0 0  
Total loans 1,616 1,629  
All other assets 137 138  
Short-Term Debt 0 0  
Accrued expenses and other liabilities (204) (193)  
Long-term debt 0 0  
VIEs that we consolidate [Member] | Carrying value [Member] | Municipal tender option bond (MTOB) [Member]      
Variable Interest Entity [Line Items]      
Trading assets 0 0  
Available-for-sale debt securities, at fair value 763 0  
Total loans 0 0  
All other assets 5 0  
Short-Term Debt (711) 0  
Accrued expenses and other liabilities (6) 0  
Long-term debt $ 0 $ 0