v3.26.1
Deposits and Borrowings - Long-Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Total long-term debt $ 50,262 $ 49,913
Total short-term borrowings and long-term debt 51,888 51,000
Time deposits, at or above FDIC insurance limit 17,700 17,400
Deposit liability, uninsured 13,400 12,900
Unsecured debt (38,421) (36,001)
Euro    
Debt Instrument [Line Items]    
Unsecured debt $ (532) (544)
Securitized debt obligations    
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 3.51%  
Carrying value $ 11,283 12,853
Total senior and subordinated notes    
Debt Instrument [Line Items]    
Carrying value $ 38,421 36,001
Senior notes | Fixed unsecured senior debt    
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 5.06%  
Carrying value $ 33,767 31,335
Subordinated notes | Fixed unsecured subordinated debt    
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 4.59%  
Carrying value $ 4,654 4,666
Total other long-term borrowings    
Debt Instrument [Line Items]    
Carrying value $ 558 1,059
FHLB advances    
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 4.82%  
Carrying value $ 536 1,037
Finance lease liabilities    
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 5.58%  
Carrying value $ 22 $ 22
Minimum | Securitized debt obligations    
Debt Instrument [Line Items]    
Stated Interest Rates 1.03%  
Minimum | Senior notes | Fixed unsecured senior debt    
Debt Instrument [Line Items]    
Stated Interest Rates 1.65%  
Minimum | Subordinated notes | Fixed unsecured subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rates 2.36%  
Minimum | FHLB advances    
Debt Instrument [Line Items]    
Stated Interest Rates 4.77%  
Minimum | Finance lease liabilities    
Debt Instrument [Line Items]    
Stated Interest Rates 3.74%  
Maximum | Securitized debt obligations    
Debt Instrument [Line Items]    
Stated Interest Rates 5.82%  
Maximum | Senior notes | Fixed unsecured senior debt    
Debt Instrument [Line Items]    
Stated Interest Rates 7.96%  
Maximum | Subordinated notes | Fixed unsecured subordinated debt    
Debt Instrument [Line Items]    
Stated Interest Rates 6.18%  
Maximum | FHLB advances    
Debt Instrument [Line Items]    
Stated Interest Rates 4.82%  
Maximum | Finance lease liabilities    
Debt Instrument [Line Items]    
Stated Interest Rates 9.91%