Quarterly report pursuant to Section 13 or 15(d)

HELD-TO-MATURITY SECURITIES - Continuous Unrealized Loss Position (Details)

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HELD-TO-MATURITY SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 6,249 $ 7,048
Over 12 Months 2,049 1,416
Total 8,298 8,464
Gross Unrealized Losses    
Less than 12 Months (223) (84)
Over 12 Months (68) (40)
Total (291) (124)
Collateralized Mortgage Obligations [Member]    
Fair Value    
Less than 12 Months 958 2,369
Over 12 Months 1,264 1,019
Total 2,222 3,388
Gross Unrealized Losses    
Less than 12 Months (29) (26)
Over 12 Months (48) (32)
Total (77) (58)
Residential Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 1,552 974
Over 12 Months 0 0
Total 1,552 974
Gross Unrealized Losses    
Less than 12 Months (54) (7)
Over 12 Months 0 0
Total (54) (7)
Commercial Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 3,458 3,456
Over 12 Months 716 253
Total 4,174 3,709
Gross Unrealized Losses    
Less than 12 Months (134) (49)
Over 12 Months (18) (6)
Total (152) (55)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 281 249
Over 12 Months 64 139
Total 345 388
Gross Unrealized Losses    
Less than 12 Months (6) (2)
Over 12 Months (2) (2)
Total (8) (4)
Total U.S. Treasury, Federal agency and other agency securities    
Fair Value    
Less than 12 Months 6,249 7,048
Over 12 Months 2,044 1,411
Total 8,293 8,459
Gross Unrealized Losses    
Less than 12 Months (223) (84)
Over 12 Months (68) (40)
Total (291) (124)
Municipal securities    
Fair Value    
Less than 12 Months 0 0
Over 12 Months 5 5
Total 5 5
Gross Unrealized Losses    
Less than 12 Months 0 0
Over 12 Months 0 0
Total $ 0 $ 0