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, 2018
Dec. 31, 2017
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure $ 643 $ 413
Consumer loans 84 93
Trading account securities 85 86
Available-for-sale securities 14,070 14,869
Other Securities, Fair Value 597 600
Gross amounts of recognized assets 454 322
Derivative assets netting (275) (190)
Net amounts of assets presented in the condensed consolidated balance sheets 179 132
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 406 331
Gross amounts offset in the condensed consolidated balance sheets (204) (245)
Derivative liabilities 202 86
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6 5
Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 183 70
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,765 3,878
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 373 467
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 87 109
Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 659 1,367
Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,743 2,487
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 643 413
Trading account securities 85 86
Available-for-sale securities 14,070 14,869
Other Securities, Fair Value 21 19
MSRs 11 11
Derivative assets netting (275) (190)
Net amounts of assets presented in the condensed consolidated balance sheets 179 132
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (204) (245)
Derivative liabilities 202 86
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6 5
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 7,250 6,484
Fair Value, Measurements, Recurring | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 183 70
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 5  
Available-for-sale securities 3,765 3,878
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 373 467
Fair Value, Measurements, Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 87 109
Fair Value, Measurements, Recurring | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 80 86
Available-for-sale securities 4 2
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 659 1,367
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,743 2,487
Fair Value, Measurements, Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 0 0
Trading account securities 78 83
Available-for-sale securities 6 5
Other Securities, Fair Value 21 19
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 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6 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 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal 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 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 78 83
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 643 413
Consumer loans 50 55
Trading account securities 7 3
Available-for-sale securities 10,886 11,673
MSRs 0 0
Gross amounts of recognized assets 446 316
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 399 326
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
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 7,250 6,484
Fair Value, Measurements, Recurring | Level 2 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 183 70
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 5  
Available-for-sale securities 587 711
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 373 443
Fair Value, Measurements, Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 87 109
Fair Value, Measurements, Recurring | Level 2 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 2 3
Available-for-sale securities 4 2
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 659 1,367
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,743 2,487
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 34 38
Trading account securities 0 0
Available-for-sale securities 3,178 3,191
MSRs 11 11
Gross amounts of recognized assets 8 6
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 7 5
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
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 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 3,178 3,167
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 24
Fair Value, Measurements, Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Other Debt Obligations [Member]    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities $ 0 $ 0