Annual report pursuant to Section 13 and 15(d)

HELD-TO-MATURITY SECURITIES - Contractual Maturities (Details)

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HELD-TO-MATURITY SECURITIES - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Amortized Cost $ 9,091 $ 7,807
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Fair Value 8,971 7,787
Collateralized Mortgage Obligations [Member]    
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 0 0
Held-to-maturity Securities, 6-10 years 0 0
Held-to-maturity Securities, Over 10 years 3,714 4,189
Amortized Cost 3,714 4,189
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 0 0
Fair Value, Over 10 Years 3,657 4,163
Held-to-maturity Securities, Fair Value 3,657 4,163
Residential MBS    
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 0 0
Held-to-maturity Securities, 6-10 years 28 15
Held-to-maturity Securities, Over 10 years 1,021 83
Amortized Cost 1,049 98
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 28 15
Fair Value, Over 10 Years 1,016 86
Held-to-maturity Securities, Fair Value 1,044 101
Commercial MBS    
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 38 0
Held-to-maturity Securities, 6-10 years 1 26
Held-to-maturity Securities, Over 10 years 3,752 2,885
Amortized Cost 3,791 2,911
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 37 0
Fair Value, 6-10 years 1 25
Fair Value, Over 10 Years 3,698 2,891
Held-to-maturity Securities, Fair Value 3,736 2,916
Other agencies    
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 7 0
Held-to-maturity Securities, 6-10 years 362 399
Held-to-maturity Securities, Over 10 years 163 204
Amortized Cost 532 603
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 8 0
Fair Value, 6-10 years 360 399
Fair Value, Over 10 Years 161 202
Held-to-maturity Securities, Fair Value 529 601
Total Federal agencies and other agencies    
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Amortized Cost 9,086 7,801
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Fair Value 8,966 7,781
Municipal securities    
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 0 0
Held-to-maturity Securities, 6-10 years 0 0
Held-to-maturity Securities, Over 10 years 5 6
Amortized Cost 5 6
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 0 0
Fair Value, Over 10 Years 5 6
Held-to-maturity Securities, Fair Value $ 5 $ 6