Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Schedule of Long-Term Debt and Debt Issuances (Details)

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BORROWINGS - Schedule of Long-Term Debt and Debt Issuances (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term debt $ 14,711 $ 9,686
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Long-term debt 5,708 211
Other borrowings    
Debt Instrument [Line Items]    
Long-term debt 547 572
Parent    
Debt Instrument [Line Items]    
Long-term debt 3,659 3,980
Parent | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 2,908 3,005
Parent | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt 751 975
Bank    
Debt Instrument [Line Items]    
Long-term debt 4,797 4,923
Bank | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 4,146 4,272
Bank | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt $ 651 $ 651