Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure $ 1,141 $ 1,198
Consumer loans 131 94
Gross amounts of recognized assets 1,684 1,946
Derivative assets netting (732) (889)
Net amounts of assets presented in the condensed consolidated balance sheets 952 1,057
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,048 1,033
Gross amounts offset in the condensed consolidated balance sheets (875) (917)
Derivatives 173 116
Short-term Debt 391 183
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 93  
Available-for-sale securities 22,915 16,485
Other securities 66 59
Loans Held-for-sale, Fair Value Disclosure 1,141 1,198
MSRs 327 210
Derivative assets netting (732) (889)
Net amounts of assets presented in the condensed consolidated balance sheets 952 1,057
Restricted Assets, Fair Value Disclosure 130 73
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (875) (917)
Derivatives 173 116
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 92 62
Available-for-sale securities 3,661 3,004
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 142 9
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4 4
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,649 3,666
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 13,197 7,935
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,368 1,163
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 284 62
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 301 192
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 1  
Available-for-sale securities 1,304 445
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 5 5
Other securities 42 59
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 0 0
MSRs 0 0
Gross amounts of recognized assets 0 0
Restricted Assets, Fair Value Disclosure 130 73
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Fair Value, Measurements, Recurring | Level 1 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Trading account securities 93  
Available-for-sale securities 19,237 13,510
Other securities 24 0
Loans Held-for-sale, Fair Value Disclosure 1,141 1,198
Consumer loans 110 71
MSRs 0 0
Gross amounts of recognized assets 1,655 1,903
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,042 1,031
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 92 62
Available-for-sale securities 52 53
Fair Value, Measurements, Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 124 0
Fair Value, Measurements, Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4 4
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,649 3,666
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 13,197 7,935
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,368 1,163
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 284 62
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 255 182
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 1  
Available-for-sale securities 1,304 445
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 3,673 2,970
Other securities 0  
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 21 23
MSRs 327 210
Gross amounts of recognized assets 29 43
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 6 2
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,609 2,951
Fair Value, Measurements, Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 18 9
Fair Value, Measurements, Recurring | Level 3 | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 46 10
Fair Value, Measurements, Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities $ 0 $ 0