Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 649 $ 506
Loans and leases, fair value 175 174
Long-term debt, fair value 416 0
Fair Value, Measurements, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 649 506
Long-term debt, fair value 416  
Long-term debt, aggregate unpaid principal 411  
Difference (5)  
Fair Value, Measurements, Recurring | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 649 506
Loans held for sale, aggregate unpaid principal 630 489
Difference 19 17
Fair Value, Measurements, Recurring | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 175 174
Loans held for investment, aggregate unpaid principal 186 184
Difference (11) (10)
Fair Value, Measurements, Recurring | 90 or  more days | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 0 0
Loans held for sale, aggregate unpaid principal 0 0
Difference 0 0
Fair Value, Measurements, Recurring | 90 or  more days | Loans held for investment    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 3 2
Loans held for investment, aggregate unpaid principal 4 3
Difference $ (1) $ (1)