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, 2019
Dec. 31, 2018
Assets measured at fair value on a recurring basis    
Trading account securities $ 176 $ 105
Loans Held-for-sale, Fair Value Disclosure 736 613
Consumer loans 78 79
Gross amounts of recognized assets 831 500
Derivative assets netting (398) (291)
Net amounts of assets presented in the condensed consolidated balance sheets 433 209
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 489 404
Gross amounts offset in the condensed consolidated balance sheets (372) (217)
Derivative liabilities 117 187
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 176 105
Available-for-sale securities 13,695 13,780
Other securities 14 22
Loans Held-for-sale, Fair Value Disclosure 736 613
MSRs 9 10
Derivative assets netting (398) (291)
Net amounts of assets presented in the condensed consolidated balance sheets 433 209
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (372) (217)
Derivative liabilities 117 187
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 105 28
Available-for-sale securities 3,260 3,440
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 68 77
Available-for-sale securities 5 4
Fair Value, Measurements, Recurring | US Treasury Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 11 5
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6,458 6,999
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,880 1,255
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,460 1,583
Fair Value, Measurements, Recurring | Other Federal Agencies [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 3  
Available-for-sale securities 115 126
Fair Value, Measurements, Recurring | Asset-backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 455 315
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 51 53
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 68 78
Available-for-sale securities 11 5
Other securities 14 22
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 0 0
MSRs 0 0
Gross amounts of recognized assets 2 21
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 12 11
Fair Value, Measurements, Recurring | Level 1 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 1
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 68 77
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 11 5
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 108 27
Available-for-sale securities 10,482 10,610
Loans Held-for-sale, Fair Value Disclosure 736 613
Consumer loans 50 49
MSRs 0 0
Gross amounts of recognized assets 817 474
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 474 390
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 105 27
Available-for-sale securities 58 275
Fair Value, Measurements, Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 5 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 6,458 6,999
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,880 1,255
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,460 1,583
Fair Value, Measurements, Recurring | Level 2 | Other Federal Agencies [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 3  
Available-for-sale securities 115 126
Fair Value, Measurements, Recurring | Level 2 | Asset-backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 455 315
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 51 53
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,202 3,165
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 28 30
MSRs 9 10
Gross amounts of recognized assets 12 5
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 3 3
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 3,202 3,165
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  
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  
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 0 0
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