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, 2024
Dec. 31, 2023
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 26,801 $ 25,305
Loans held for sale 487 506
Loans Accounted for Under FVO 175 174
Gross amounts of recognized assets 1,740 1,723
Derivative assets netting (1,399) (1,330)
Net amounts of assets presented in the condensed consolidated balance sheets 341 393
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,626 1,421
Gross amounts offset in the condensed consolidated balance sheets (872) (751)
Derivative liabilities 754 670
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5,027 2,856
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,331 3,373
Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10,930 11,382
Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,795 1,827
Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 147 155
Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 117 119
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 351 356
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,018 2,043
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 167 125
Available-for-sale securities 26,801 25,305
Other securities 32 32
Loans held for sale 487 506
MSRs 534 515
Derivative assets netting (1,399) (1,330)
Net amounts of assets presented in the condensed consolidated balance sheets 341 393
Assets held in trust for deferred compensation plans 186 177
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (872) (751)
Derivative liabilities 754 670
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Trading account securities 92 91
Available-for-sale securities 5,027 2,856
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 51 32
Available-for-sale securities 3,331 3,373
Fair Value, Measurements, Recurring | Residential CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,075 3,184
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10,930 11,382
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,795 1,827
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities   2
Available-for-sale securities 147 155
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 117 119
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 351 356
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 24  
Available-for-sale securities 2,018 2,043
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10 10
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 92 91
Available-for-sale securities 5,027 2,856
Other securities 31 30
Loans held for sale 0 0
Loans Accounted for Under FVO 0 0
MSRs 0 0
Gross amounts of recognized assets 0 0
Assets held in trust for deferred compensation plans 186 177
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Trading account securities 92 91
Available-for-sale securities 5,027 2,856
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 | Residential CMO    
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    
Trading account securities   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 | 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 1 | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Trading account securities 75 34
Available-for-sale securities 18,389 19,019
Other securities 1 2
Loans held for sale 487 506
Loans Accounted for Under FVO 117 120
MSRs 0 0
Gross amounts of recognized assets 1,734 1,720
Assets held in trust for deferred compensation plans 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,624 1,416
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
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 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 51 32
Available-for-sale securities 38 38
Fair Value, Measurements, Recurring | Level 2 | Residential CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,075 3,184
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10,930 11,382
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,795 1,827
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities   2
Available-for-sale securities 147 155
Fair Value, Measurements, Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 97 99
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 279 281
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 24  
Available-for-sale securities 2,018 2,043
Fair Value, Measurements, Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10 10
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,385 3,430
Other securities 0 0
Loans held for sale 0 0
Loans Accounted for Under FVO 58 54
MSRs 534 515
Gross amounts of recognized assets 6 3
Assets held in trust for deferred compensation plans 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 2 5
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
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 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,293 3,335
Fair Value, Measurements, Recurring | Level 3 | Residential CMO    
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    
Trading account securities   0
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 20 20
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 72 75
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
Fair Value, Measurements, Recurring | Level 3 | Other securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 0 $ 0