Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details)

v3.10.0.1
FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets measured at fair value on a recurring basis    
Trading account securities $ 83 $ 86
Available-for-sale securities 13,727 14,869
Other securities 565 600
Loans Held-for-sale, Fair Value Disclosure 727 413
Consumer loans 81 93
Gross amounts of recognized assets 498 322
Derivative assets netting (318) (190)
Net amounts of assets presented in the condensed consolidated balance sheets 180 132
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 441 331
Gross amounts offset in the condensed consolidated balance sheets (221) (245)
Derivative liabilities 220 86
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 3,848 3,878
U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 620 1,367
Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,703 2,487
Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 157 70
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 363 467
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 87 109
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
Trading account securities 83 86
Available-for-sale securities 13,727 14,869
Other securities 22 19
Loans Held-for-sale, Fair Value Disclosure 727 413
MSRs 11 11
Derivative assets netting (318) (190)
Net amounts of assets presented in the condensed consolidated balance sheets 180 132
Liabilities measured at fair value on a recurring basis    
Gross amounts offset in the condensed consolidated balance sheets (221) (245)
Derivative liabilities 220 86
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 5  
Available-for-sale securities 3,848 3,878
Fair Value, Measurements, Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 78 86
Available-for-sale securities 4 2
Fair Value, Measurements, Recurring | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6,940 6,484
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 620 1,367
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,703 2,487
Fair Value, Measurements, Recurring | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 157 70
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 363 467
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 | Level 1    
Assets measured at fair value on a recurring basis    
Trading account securities 77 83
Available-for-sale securities 5 5
Other securities 22 19
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  
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 77 83
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 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 | 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 2    
Assets measured at fair value on a recurring basis    
Trading account securities 6 3
Available-for-sale securities 10,445 11,673
Loans Held-for-sale, Fair Value Disclosure 727 413
Consumer loans 49 55
MSRs 0 0
Gross amounts of recognized assets 493 316
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 437 326
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 571 711
Fair Value, Measurements, Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 1 3
Available-for-sale securities 4 2
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 6,940 6,484
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage Backed Securities [Member]    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 620 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 1,703 2,487
Fair Value, Measurements, Recurring | Level 2 | Federal agencies, Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 157 70
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 363 443
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 3    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities 3,277 3,191
Loans Held-for-sale, Fair Value Disclosure 0 0
Consumer loans 32 38
MSRs 11 11
Gross amounts of recognized assets 5 6
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 4 5
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 3,277 3,167
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 | 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 | 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