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, 2020
Dec. 31, 2019
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure $ 836 $ 781
Consumer loans 81 81
Gross amounts of recognized assets 2,384 856
Derivative assets netting (1,302) (404)
Net amounts of assets presented in the condensed consolidated balance sheets 1,082 452
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,372 521
Gross amounts offset in the condensed consolidated balance sheets (1,066) (417)
Derivative liabilities 306 104
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 36 99
Available-for-sale securities 14,622 14,149
Other securities 50 54
Loans Held-for-sale, Fair Value Disclosure 836 781
MSRs 165 7
Derivative assets netting (1,302) (404)
Net amounts of assets presented in the condensed consolidated balance sheets 1,082 452
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (1,066) (417)
Derivative liabilities 306 104
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 28 63
Available-for-sale securities 2,992 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 2 2
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 8 32
Available-for-sale securities 3 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 5,723 5,085
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 4,304 4,222
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 849 976
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 547 579
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 47 51
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 8 30
Available-for-sale securities 8 10
Other securities 50 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 8 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 28 69
Available-for-sale securities 11,606 11,090
Loans Held-for-sale, Fair Value Disclosure 836 781
Consumer loans 55 55
MSRs 0 0
Gross amounts of recognized assets 2,342 848
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 1,369 519
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 28 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 0 2
Available-for-sale securities 3 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 5,723 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 4,304 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 849 976
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 478 531
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 47 51
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,008 3,049
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 26 26
MSRs 165 7
Gross amounts of recognized assets 42 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 2,937 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 2 2
Fair Value, Measurements, Recurring | Level 3 | Other 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 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 69 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