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
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 777 $ 1,270
Loans and leases, fair value 179 171
Fair Value, Measurements, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 777 1,270
Fair Value, Measurements, Recurring | Mortgages Held For Sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principal 778 1,237
Difference (1) 33
Fair Value, Measurements, Recurring | Mortgages Held To Maturity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 179 171
Loans held for investment, aggregate unpaid principal 184 177
Difference (5) (6)
Fair Value, Measurements, Recurring | 90 or  more days | Mortgages 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 | Mortgages Held To Maturity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 5 4
Loans held for investment, aggregate unpaid principal 5 4
Difference $ 0 $ 0