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, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Long-term debt $ 14,894 [1] $ 12,394
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Long-term debt 2,699 2,731
Auto Loan Securitization Trust    
Debt Instrument [Line Items]    
Long-term debt $ 1,401 0
Weighted average rate 5.38%  
Other borrowings    
Debt Instrument [Line Items]    
Long-term debt $ 510 528
Parent    
Debt Instrument [Line Items]    
Long-term debt 6,171 4,993
Parent | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 5,423 4,233
Parent | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt 748 760
Bank    
Debt Instrument [Line Items]    
Long-term debt 4,113 4,142
Bank | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 3,452 3,480
Bank | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt $ 661 $ 662
[1] Includes VIE balances in net loans and leases and long-term debt of $1.5 billion and $1.4 billion, respectively, at March 31, 2024, and VIE balances in other assets of $136 million and $82 million, and other liabilities of $55 million and $57 million, at March 31, 2024 and December 31, 2023, respectively. See Note 14 - “Variable Interest Entities” for additional information.