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, 2017
Dec. 31, 2016
Assets measured at fair value on a recurring basis    
Trading account securities $ 86 $ 133
Available-for-sale and other securities 15,469 15,563
Consumer loans 93 82
Derivative assets gross 322 420
Derivative assets netting (190) (182)
Derivative assets 132 238
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 331 371
Derivative liabilities netting (245) (272)
Derivative liabilities 86 99
U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 5 6
Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 1,367 200
Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 2,487 3,663
Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 70 73
Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 3,878 3,250
Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 467 794
Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 109 199
Recurring    
Assets measured at fair value on a recurring basis    
Loans held for sale 413 438
Trading account securities 86 133
Available-for-sale and other securities 14,888 15,015
MSRs 11 14
Derivative assets netting (190) (182)
Derivative assets 132 238
Liabilities measured at fair value on a recurring basis    
Derivative liabilities netting (245) (272)
Derivative liabilities 86 99
Short-term borrowings 0 0
Recurring | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 5 6
Recurring | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,484 6,810
Recurring | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 1,367 200
Recurring | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 2,487 3,663
Recurring | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 70 73
Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities   1
Available-for-sale and other securities 3,878 3,250
Recurring | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 467 794
Recurring | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 109 199
Recurring | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 86 132
Available-for-sale and other securities 21 20
Recurring | Level 1    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Trading account securities 83 132
Available-for-sale and other securities 25 22
Consumer loans 0 0
MSRs 0 0
Derivative assets gross 0 0
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 0 0
Short-term borrowings 0 0
Recurring | Level 1 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 5 6
Recurring | Level 1 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 1 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 1 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities   0
Available-for-sale and other securities 0 0
Recurring | Level 1 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 1 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 1 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 83 132
Available-for-sale and other securities 20 16
Recurring | Level 2    
Assets measured at fair value on a recurring basis    
Loans held for sale 413 438
Trading account securities 3 1
Available-for-sale and other securities 11,672 12,119
Consumer loans 55 34
MSRs 0 0
Derivative assets gross 316 414
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 326 363
Short-term borrowings 0 0
Recurring | Level 2 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 2 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 6,484 6,810
Recurring | Level 2 | Residential MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 1,367 200
Recurring | Level 2 | Commercial MBS    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 2,487 3,663
Recurring | Level 2 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 70 73
Recurring | Level 2 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities   1
Available-for-sale and other securities 711 452
Recurring | Level 2 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 443 718
Recurring | Level 2 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 109 199
Recurring | Level 2 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 3 0
Available-for-sale and other securities 1 4
Recurring | Level 3    
Assets measured at fair value on a recurring basis    
Loans held for sale 0 0
Trading account securities 0 0
Available-for-sale and other securities 3,191 2,874
Consumer loans 38 48
MSRs 11 14
Derivative assets gross 6 6
Liabilities measured at fair value on a recurring basis    
Gross amounts of recognized liabilities 5 8
Short-term borrowings 0 0
Recurring | Level 3 | U.S. Treasury securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 3 | Residential CMOs    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 3 | Other agencies    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 3 | Municipal securities    
Assets measured at fair value on a recurring basis    
Trading account securities   0
Available-for-sale and other securities 3,167 2,798
Recurring | Level 3 | Asset-backed securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 24 76
Recurring | Level 3 | Corporate debt    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring | Level 3 | Other securities    
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities $ 0 $ 0