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, 2021
Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Fair Value Disclosure $ 1,297 $ 1,198
Loans and leases, fair value 139 94
Fair Value, Measurements, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Fair Value Disclosure 1,297 1,198
Fair Value, Measurements, Recurring | Mortgages Held For Sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held For Sale Unpaid Principal 1,260 1,134
Difference (37) (64)
Fair Value, Measurements, Recurring | Mortgages Held To Maturity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 139 94
Loans Held To Maturity Unpaid Principal 143 99
Difference (4) (5)
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 Disclosure 0 2
Loans Held For Sale Unpaid Principal 0 2
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 3 7
Loans Held To Maturity Unpaid Principal 4 8
Difference $ (1) $ (1)