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, 2023
Dec. 31, 2022
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 24,086 $ 23,423
Loans held for sale 446 520
Loans Accounted for Under FVO 187 185
Gross amounts of recognized assets 1,990 2,164
Derivative assets netting (1,564) (1,808)
Net amounts of assets presented in the condensed consolidated balance sheets 426 356
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,598 2,337
Gross amounts offset in the condensed consolidated balance sheets (861) (1,345)
Derivative liabilities 737 992
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,381 3,290
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 103
Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 12,333 12,263
Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,967 1,953
Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 176 182
Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 130 128
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 375 372
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,265 2,214
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 24,086 23,423
Other securities 33 32
Loans held for sale 446 520
MSRs 485 494
Derivative assets netting (1,564) (1,808)
Net amounts of assets presented in the condensed consolidated balance sheets 426 356
Restricted Assets, Fair Value Disclosure 164 155
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (861) (1,345)
Derivative liabilities 737 992
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 18 19
Available-for-sale securities 3,381 3,290
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 103
Fair Value, Measurements, Recurring | Residential CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,450 2,914
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 12,333 12,263
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,967 1,953
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 176 182
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 130 128
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 375 372
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,265 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    
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 164 155
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 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 103
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    
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    
Available-for-sale securities 20,648 19,978
Other securities 1 1
Loans held for sale 446 520
Loans Accounted for Under FVO 172 169
MSRs 0 0
Gross amounts of recognized assets 1,984 2,161
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,595 2,332
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 18 19
Available-for-sale securities 42 42
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 | Residential CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,450 2,914
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 12,333 12,263
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,967 1,953
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 176 182
Fair Value, Measurements, Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 110 108
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 301 298
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,265 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    
Available-for-sale securities 3,433 3,342
Other securities 0 0
Loans held for sale 0 0
Loans Accounted for Under FVO 15 16
MSRs 485 494
Gross amounts of recognized assets 6 3
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 3 5
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 3,339 3,248
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 | 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 74 74
Fair Value, Measurements, Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
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