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
Mar. 31, 2021
Dec. 31, 2020
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure $ 1,531 $ 1,198
Consumer loans 118 94
Gross amounts of recognized assets 1,829 1,946
Derivative assets netting (816) (889)
Net amounts of assets presented in the condensed consolidated balance sheets 1,013 1,057
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 874 1,033
Gross amounts offset in the condensed consolidated balance sheets (703) (917)
Derivatives 171 116
Short-term Debt 219 183
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 51  
Available-for-sale securities 19,375 16,485
Other securities 59 59
Loans Held-for-sale, Fair Value Disclosure 1,531 1,198
MSRs 274 210
Derivative assets netting (816) (889)
Net amounts of assets presented in the condensed consolidated balance sheets 1,013 1,057
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (703) (917)
Derivatives 171 116
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 48 62
Available-for-sale securities 3,122 3,004
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 50 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 3,172 3,666
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10,645 7,935
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,227 1,163
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 46 62
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 247 192
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 3  
Available-for-sale securities 857 445
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
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 51  
Available-for-sale securities 16,242 13,510
Other securities 17 0
Loans Held-for-sale, Fair Value Disclosure 1,531 1,198
Consumer loans 96 71
MSRs 0 0
Gross amounts of recognized assets 1,808 1,903
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 863 1,031
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 48 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 39 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 3,172 3,666
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10,645 7,935
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,227 1,163
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 46 62
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 200 182
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 3  
Available-for-sale securities 857 445
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 3,128 2,970
Other securities 0  
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 22 23
MSRs 274 210
Gross amounts of recognized assets 21 43
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 11 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 3,070 2,951
Fair Value, Measurements, Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 11 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 47 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