Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Home Equity Loan, Credit Card and Other Asset-backed VIEs (Details)

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Securitizations and Other Variable Interest Entities - Home Equity Loan, Credit Card and Other Asset-backed VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
On-balance sheet assets        
Trading account assets $ 239,062 $ 214,348    
Debt securities carried at fair value 241,956 238,101    
Held-to-maturity securities 198,718 203,652    
Loans and leases 945,615 946,895    
Allowance for loan and lease losses (9,577) (9,601) $ (10,260) $ (10,393)
All other assets 131,884 116,320    
Total assets 2,377,164 2,354,507 $ 2,328,478  
On-balance sheet liabilities        
Long-term debt 233,929 229,392    
Total liabilities 2,110,154 2,089,182    
Consolidated VIEs        
On-balance sheet assets        
Trading account assets 5,453 5,798    
Loans and leases 41,528 43,850    
Allowance for loan and lease losses (884) (912)    
All other assets 332 337    
Total assets 46,429 49,073    
On-balance sheet liabilities        
Long-term debt 8,182 10,944    
All other liabilities 25 30    
Total liabilities 9,754 11,716    
Home Equity Loan | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 855 908    
On-balance sheet assets        
Total assets 26 27    
Unconsolidated total assets of VIEs 1,710 1,813    
Home Equity Loan | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 79 85    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 123 133    
Allowance for loan and lease losses (4) (5)    
All other assets 4 4    
Total assets 123 132    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 51 55    
All other liabilities 0 0    
Total liabilities 51 55    
Home Equity Loan | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 0    
Debt securities carried at fair value 26 27    
Held-to-maturity securities 0 0    
Credit Card | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 0 0    
On-balance sheet assets        
Total assets 0 0    
Unconsolidated total assets of VIEs 0 0    
Credit Card | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 19,452 18,800    
On-balance sheet assets        
Trading account assets 0 0    
Loans and leases 28,062 29,906    
Allowance for loan and lease losses (874) (901)    
All other assets 131 136    
Total assets 27,319 29,141    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 7,852 10,321    
All other liabilities 15 20    
Total liabilities 7,867 10,341    
Residual interests 12,100 11,000    
Credit Card | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 0    
Debt securities carried at fair value 0 0    
Held-to-maturity securities 0 0    
Resecuritization Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 7,755 7,647    
On-balance sheet assets        
Total assets 7,755 7,647    
Unconsolidated total assets of VIEs 17,440 16,949    
Resecuritization Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 49 128    
On-balance sheet assets        
Trading account assets 69 366    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
All other assets 0 0    
Total assets 69 366    
On-balance sheet liabilities        
Short-term borrowings 0 0    
Long-term debt 20 238    
All other liabilities 0 0    
Total liabilities 20 238    
Resecuritization Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 1,700 1,419    
Debt securities carried at fair value 1,297 1,337    
Held-to-maturity securities 4,758 4,891    
Municipal Bond Trusts | Unconsolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 2,296 2,150    
On-balance sheet assets        
Total assets 0 26    
Unconsolidated total assets of VIEs 2,947 2,829    
Municipal Bond Trusts | Consolidated VIEs        
Variable Interest Entity [Line Items]        
Maximum loss exposure 2,380 1,540    
On-balance sheet assets        
Trading account assets 2,391 1,553    
Loans and leases 0 0    
Allowance for loan and lease losses 0 0    
All other assets 1 1    
Total assets 2,392 1,554    
On-balance sheet liabilities        
Short-term borrowings 1,547 742    
Long-term debt 12 12    
All other liabilities 0 0    
Total liabilities 1,559 754    
Municipal Bond Trusts | Senior Lien | Unconsolidated VIEs        
On-balance sheet assets        
Trading account assets 0 26    
Debt securities carried at fair value 0 0    
Held-to-maturity securities $ 0 $ 0