Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 28,460 $ 16,485
Loans held for sale 1,270 1,198
Loans held for investment 171 94
Derivative assets gross 1,065 1,946
Derivative assets netting (465) (889)
Derivative assets 600 1,057
Total short-term borrowings 334 183
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 743 1,033
Derivative liabilities netting (624) (917)
Derivative liabilities 119 116
U.S. Treasury securities    
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 15,508 7,935
Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,865 1,163
Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 248 62
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,526 3,004
Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 106 9
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 382 192
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,167 445
Recurring    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 28,460 16,485
Other securities 72 59
Loans held for sale 1,270 1,198
Loans held for investment 171 94
MSRs 351 210
Derivative assets netting (465) (889)
Derivative assets 600 1,057
Assets held in trust for deferred compensation plans 156 73
Liabilities measured at fair value on a recurring basis    
Derivative liabilities netting (624) (917)
Derivative liabilities 119 116
Recurring | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Recurring | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4,649 3,666
Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 15,508 7,935
Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,865 1,163
Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 248 62
Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 46 62
Available-for-sale securities 3,526 3,004
Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 106 9
Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 382 192
Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,167 445
Recurring | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4 4
Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Other securities 65 59
Loans held for sale 0 0
Loans held for investment 0 0
MSRs 0 0
Derivative assets gross 0 0
Assets held in trust for deferred compensation plans 156 73
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 0 0
Recurring | Level 1 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Recurring | Level 1 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
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
Recurring | Level 1 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 24,888 13,510
Other securities 7 0
Loans held for sale 1,270 1,198
Loans held for investment 152 71
MSRs 0 0
Derivative assets gross 1,055 1,903
Assets held in trust for deferred compensation plans 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 737 1,031
Recurring | Level 2 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 2 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4,649 3,666
Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 15,508 7,935
Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,865 1,163
Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 248 62
Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 46 62
Available-for-sale securities 49 53
Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 86 0
Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 312 182
Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 2,167 445
Recurring | Level 2 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4 4
Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,567 2,970
Other securities 0 0
Loans held for sale 0 0
Loans held for investment 19 23
MSRs 351 210
Derivative assets gross 10 43
Assets held in trust for deferred compensation plans 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 6 2
Recurring | Level 3 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,477 2,951
Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 20 9
Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 70 10
Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 0 $ 0