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, 2020
Dec. 31, 2019
Assets measured at fair value on a recurring basis    
Loans held for sale $ 1,198 $ 781
Consumer loans 94 81
Derivative assets gross 1,946 856
Derivative assets netting (889) (404)
Derivative assets 1,057 452
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,033 521
Derivative liabilities netting (917) (417)
Derivative liabilities 116 104
Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities   99
Available-for-sale securities 16,485 14,149
Other Securities, Fair Value 59 54
Loans held for sale 1,198 781
MSRs 210 7
Derivative assets netting (889) (404)
Derivative assets 1,057 452
Liabilities measured at fair value on a recurring basis    
Derivative liabilities netting (917) (417)
Derivative liabilities 116 104
Recurring | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 10
Recurring | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,666 5,085
Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 7,935 4,222
Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,163 976
Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities   4
Available-for-sale securities 62 165
Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 62 63
Available-for-sale securities 3,004 3,055
Recurring | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 9 2
Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 192 579
Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 445 51
Recurring | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Trading account securities   32
Available-for-sale securities 4 4
Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities   30
Available-for-sale securities 5 10
Other Securities, Fair Value 59 54
Loans held for sale 0 0
Consumer loans 0 0
MSRs 0 0
Derivative assets gross 0 0
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 10
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    
Trading account securities   0
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    
Trading account securities   30
Available-for-sale securities 0 0
Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Trading account securities   69
Available-for-sale securities 13,510 11,090
Other Securities, Fair Value 0 0
Loans held for sale 1,198 781
Consumer loans 71 55
MSRs 0 0
Derivative assets gross 1,903 848
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,031 519
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 3,666 5,085
Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 7,935 4,222
Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,163 976
Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Trading account securities   4
Available-for-sale securities 62 165
Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 62 63
Available-for-sale securities 53 56
Recurring | Level 2 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 182 531
Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 445 51
Recurring | Level 2 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Trading account securities   2
Available-for-sale securities 4 4
Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities   0
Available-for-sale securities 2,970 3,049
Other Securities, Fair Value 0 0
Loans held for sale 0 0
Consumer loans 23 26
MSRs 210 7
Derivative assets gross 43 8
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 2 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    
Trading account securities   0
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 2,951 2,999
Recurring | Level 3 | Private-label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 9 2
Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 10 48
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    
Trading account securities   0
Available-for-sale securities $ 0 $ 0