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
Sep. 30, 2021
Dec. 31, 2020
Assets measured at fair value on a recurring basis    
Fair Value $ 25,654 $ 16,485
Loans Held-for-sale, Fair Value Disclosure 1,297 1,198
Consumer loans 139 94
Gross amounts of recognized assets 1,586 1,946
Derivative assets netting (686) (889)
Net amounts of assets presented in the condensed consolidated balance sheets 900 1,057
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,063 1,033
Gross amounts offset in the condensed consolidated balance sheets (813) (917)
Derivatives 250 116
Short-term Debt 435 183
Municipal securities    
Assets measured at fair value on a recurring basis    
Fair Value 3,634 3,004
Private-label CMO    
Assets measured at fair value on a recurring basis    
Fair Value 120 9
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Fair Value 5 5
Residential MBS    
Assets measured at fair value on a recurring basis    
Fair Value 14,337 7,935
Commercial MBS    
Assets measured at fair value on a recurring basis    
Fair Value 1,498 1,163
Other agencies    
Assets measured at fair value on a recurring basis    
Fair Value 264 62
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 285 192
Corporate debt    
Assets measured at fair value on a recurring basis    
Fair Value 1,773 445
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 77  
Fair Value 25,654 16,485
Other securities 86 59
Loans Held-for-sale, Fair Value Disclosure 1,297 1,198
MSRs 338 210
Derivative assets netting (686) (889)
Net amounts of assets presented in the condensed consolidated balance sheets 900 1,057
Restricted Assets, Fair Value Disclosure 151 73
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (813) (917)
Derivatives 250 116
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 77 62
Fair Value 3,634 3,004
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Fair Value 120 9
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Fair Value 4 4
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Fair Value 5 5
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 3,734 3,666
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Fair Value 14,337 7,935
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Fair Value 1,498 1,163
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Fair Value 264 62
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 285 192
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Fair Value 1,773 445
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Fair Value 5 5
Other securities 62 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 151 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
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Other securities    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Fair Value 5 5
Fair Value, Measurements, Recurring | Level 1 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Residential MBS    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Other agencies    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Trading account securities 77  
Fair Value 22,014 13,510
Other securities 24 0
Loans Held-for-sale, Fair Value Disclosure 1,297 1,198
Consumer loans 119 71
MSRs 0 0
Gross amounts of recognized assets 1,567 1,903
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,056 1,031
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 77 62
Fair Value 52 53
Fair Value, Measurements, Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Fair Value 102 0
Fair Value, Measurements, Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Fair Value 4 4
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 2 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 3,734 3,666
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Fair Value 14,337 7,935
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Fair Value 1,498 1,163
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Fair Value 264 62
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 250 182
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Fair Value 1,773 445
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Fair Value 3,635 2,970
Other securities 0  
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 20 23
MSRs 338 210
Gross amounts of recognized assets 19 43
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 7 2
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Fair Value 3,582 2,951
Fair Value, Measurements, Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Fair Value 18 9
Fair Value, Measurements, Recurring | Level 3 | Other securities    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Residential MBS    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Other agencies    
Assets measured at fair value on a recurring basis    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Fair Value 35 10
Fair Value, Measurements, Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Fair Value $ 0 $ 0