Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Assets measured at fair value on a recurring basis    
Loans held for sale $ 613 $ 413
Trading account securities 105 86
Consumer loans 79 93
Derivative assets gross 500 322
Derivative assets netting (291) (190)
Derivative assets 209 132
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 404 331
Derivative liabilities netting (217) (245)
Derivative liabilities 187 86
Recurring    
Assets measured at fair value on a recurring basis    
Loans held for sale 613 413
Trading account securities   86
Available-for-sale securities 13,780 14,869
Other Securities, Fair Value 22 19
MSRs 10 11
Derivative assets netting (291) (190)
Derivative assets 209 132
Liabilities measured at fair value on a recurring basis    
Derivative liabilities netting (217) (245)
Derivative liabilities 187 86
Recurring | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Recurring | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6,999 6,484
Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,255 1,367
Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,583 2,487
Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 126 70
Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 28  
Available-for-sale securities 3,440 3,878
Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 315 467
Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 53 109
Recurring | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Trading account securities 77 86
Available-for-sale securities 4 2
Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Trading account securities   83
Available-for-sale securities 5 5
Other Securities, Fair Value 22 19
Consumer loans 0 0
MSRs 0 0
Derivative assets gross 21 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 11 0
Recurring | Level 1 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 5 5
Recurring | Level 1 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0  
Recurring | Level 1 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0  
Recurring | Level 1 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 1  
Available-for-sale securities 0 0
Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Trading account securities 77 83
Available-for-sale securities 0 0
Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Loans held for sale 613 413
Trading account securities   3
Available-for-sale securities 10,610 11,673
Consumer loans 49 55
MSRs 0 0
Derivative assets gross 474 316
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 390 326
Recurring | Level 2 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 2 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 6,999 6,484
Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,255 1,367
Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 1,583 2,487
Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 126 70
Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 27  
Available-for-sale securities 275 711
Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 315 443
Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 53 109
Recurring | Level 2 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Trading account securities 0 3
Available-for-sale securities 4 2
Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Trading account securities   0
Available-for-sale securities 3,165 3,191
Consumer loans 30 38
MSRs 10 11
Derivative assets gross 5 6
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 3 5
Recurring | Level 3 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0  
Recurring | Level 3 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0  
Recurring | Level 3 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0  
Available-for-sale securities 3,165 3,167
Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 24
Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Other securities/Sovereign debt    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale securities $ 0 $ 0