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, 2023
Dec. 31, 2022
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 23,233 $ 23,423
Loans held for sale 543 520
Loans Accounted for Under FVO 175 185
Gross amounts of recognized assets 2,164 2,164
Derivative assets netting (1,715) (1,808)
Net amounts of assets presented in the condensed consolidated balance sheets 449 356
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 2,046 2,337
Gross amounts offset in the condensed consolidated balance sheets (1,111) (1,345)
Derivative liabilities 935 992
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 103
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,536 3,290
Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 11,811 12,263
Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,898 1,953
Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 168 182
Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 123 128
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 369 372
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,011 2,214
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 128  
Available-for-sale securities 23,233 23,423
Other securities 33 32
Loans held for sale 543 520
MSRs 505 494
Derivative assets netting (1,715) (1,808)
Net amounts of assets presented in the condensed consolidated balance sheets 449 356
Restricted Assets, Fair Value Disclosure 168 155
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (1,111) (1,345)
Derivative liabilities 935 992
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Trading account securities 90  
Available-for-sale securities 5 103
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 33 19
Available-for-sale securities 3,536 3,290
Fair Value, Measurements, Recurring | Residential CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,308 2,914
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 11,811 12,263
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,898 1,953
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 168 182
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 123 128
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 369 372
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 5  
Available-for-sale securities 2,011 2,214
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 | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 90  
Available-for-sale securities 5 103
Other securities 32 31
Loans held for sale 0 0
Loans Accounted for Under FVO 0 0
MSRs 0 0
Gross amounts of recognized assets 0 0
Restricted Assets, Fair Value Disclosure 168 155
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 90  
Available-for-sale securities 5 103
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    
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 38  
Available-for-sale securities 19,637 19,978
Other securities 1 1
Loans held for sale 543 520
Loans Accounted for Under FVO 142 169
MSRs 0 0
Gross amounts of recognized assets 2,159 2,161
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 2,039 2,332
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
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 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 33 19
Available-for-sale securities 40 42
Fair Value, Measurements, Recurring | Level 2 | Residential CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,308 2,914
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 11,811 12,263
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,898 1,953
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 168 182
Fair Value, Measurements, Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 103 108
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 294 298
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Trading account securities 5  
Available-for-sale securities 2,011 2,214
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 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 3,591 3,342
Other securities 0 0
Loans held for sale 0 0
Loans Accounted for Under FVO 33 16
MSRs 505 494
Gross amounts of recognized assets 5 3
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 7 5
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
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 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,496 3,248
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    
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 75 74
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