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
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term debt $ 13,072 $ 9,686
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Long-term debt 3,709 211
Other borrowings    
Debt Instrument [Line Items]    
Long-term debt 570 572
Parent    
Debt Instrument [Line Items]    
Long-term debt 3,825 3,980
Parent | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 3,057 3,005
Parent | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt 768 975
Bank    
Debt Instrument [Line Items]    
Long-term debt 4,968 4,923
Bank | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 4,309 4,272
Bank | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt $ 659 $ 651