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, 2020
Dec. 31, 2019
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure $ 954 $ 781
Consumer loans 92 81
Gross amounts of recognized assets 2,321 856
Derivative assets netting (1,214) (404)
Net amounts of assets presented in the condensed consolidated balance sheets 1,107 452
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,279 521
Gross amounts offset in the condensed consolidated balance sheets (1,107) (417)
Derivative liabilities 172 104
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities   99
Available-for-sale securities 13,297 14,149
Other securities 56 54
Loans Held-for-sale, Fair Value Disclosure 954 781
MSRs 172 7
Derivative assets netting (1,214) (404)
Net amounts of assets presented in the condensed consolidated balance sheets 1,107 452
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (1,107) (417)
Derivative liabilities 172 104
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 45 63
Available-for-sale securities 3,157 3,055
Fair Value, Measurements, Recurring | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 2
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities   32
Available-for-sale securities 4 4
Fair Value, Measurements, Recurring | US Treasury Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 8 10
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5,118 5,085
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,838 4,222
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 788 976
Fair Value, Measurements, Recurring | Other Federal Agencies [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities   4
Available-for-sale securities 147 165
Fair Value, Measurements, Recurring | Asset-backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 211 579
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 21 51
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities   30
Available-for-sale securities 8 10
Other securities 56 54
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 0 0
MSRs 0 0
Gross amounts of recognized assets 0 0
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 | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
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    
Trading account securities   30
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | US Treasury Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 8 10
Fair Value, Measurements, Recurring | Level 1 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0  
Fair Value, Measurements, Recurring | Level 1 | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0  
Fair Value, Measurements, Recurring | Level 1 | Other Federal Agencies [Member]    
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 | Asset-backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate Debt Securities [Member]    
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   69
Available-for-sale securities 10,126 11,090
Loans Held-for-sale, Fair Value Disclosure 954 781
Consumer loans 67 55
MSRs 0 0
Gross amounts of recognized assets 2,278 848
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,276 519
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 45 63
Available-for-sale securities 55 56
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities   2
Available-for-sale securities 4 4
Fair Value, Measurements, Recurring | Level 2 | US Treasury Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5,118 5,085
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,838 4,222
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 788 976
Fair Value, Measurements, Recurring | Level 2 | Other Federal Agencies [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities   4
Available-for-sale securities 147 165
Fair Value, Measurements, Recurring | Level 2 | Asset-backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 155 531
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 21 51
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities   0
Available-for-sale securities 3,163 3,049
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 25 26
MSRs 172 7
Gross amounts of recognized assets 43 8
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 3 2
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 3,102 2,999
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 2
Fair Value, Measurements, Recurring | Level 3 | Other securities    
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 | US Treasury Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Other Federal Agencies [Member]    
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 | Asset-backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 56 48
Fair Value, Measurements, Recurring | Level 3 | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities $ 0 $ 0