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, 2022
Dec. 31, 2021
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 25,152 $ 28,460
Loans held for sale 835 1,270
Loans Accounted for Under FVO 172 171
Gross amounts of recognized assets 1,560 1,065
Derivative assets netting (859) (465)
Net amounts of assets presented in the condensed consolidated balance sheets 701 600
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,229 743
Gross amounts offset in the condensed consolidated balance sheets (684) (624)
Derivative liabilities 545 119
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,329 3,526
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 13,901 15,508
Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,850 1,865
Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 225 248
Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 145 106
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 396 382
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,381 2,167
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 25,152 28,460
Other securities 66 72
Loans held for sale 835 1,270
MSRs 416 351
Derivative assets netting (859) (465)
Net amounts of assets presented in the condensed consolidated balance sheets 701 600
Restricted Assets, Fair Value Disclosure 140 156
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (684) (624)
Derivative liabilities 545 119
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 74 46
Available-for-sale securities 3,329 3,526
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 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,916 4,649
Fair Value, Measurements, Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 13,901 15,508
Fair Value, Measurements, Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,850 1,865
Fair Value, Measurements, Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 225 248
Fair Value, Measurements, Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 145 106
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 396 382
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,381 2,167
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 5
Other securities 60 65
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 140 156
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 5
Fair Value, Measurements, Recurring | Level 1 | Residential CMOs    
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 21,784 24,888
Other securities 6 7
Loans held for sale 835 1,270
Loans Accounted for Under FVO 154 152
MSRs 0 0
Gross amounts of recognized assets 1,557 1,055
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,216 737
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 74 46
Available-for-sale securities 47 49
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 CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,916 4,649
Fair Value, Measurements, Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 13,901 15,508
Fair Value, Measurements, Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,850 1,865
Fair Value, Measurements, Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 225 248
Fair Value, Measurements, Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 126 86
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 334 312
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,381 2,167
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 3,363 3,567
Other securities 0 0
Loans held for sale 0 0
Loans Accounted for Under FVO 18 19
MSRs 416 351
Gross amounts of recognized assets 3 10
Restricted Assets, Fair Value Disclosure 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 13 6
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 3,282 3,477
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 CMOs    
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 19 20
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 62 70
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