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
Mar. 31, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 6,345 $ 7,048
Over 12 Months 2,106 1,416
Total 8,451 8,464
Gross Unrealized Losses    
Less than 12 Months (181) (84)
Over 12 Months (58) (40)
Total (239) (124)
Collateralized Mortgage Obligations [Member]    
Fair Value    
Less than 12 Months 947 2,369
Over 12 Months 1,313 1,019
Total 2,260 3,388
Gross Unrealized Losses    
Less than 12 Months (23) (26)
Over 12 Months (40) (32)
Total (63) (58)
Residential Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 1,606 974
Over 12 Months 0 0
Total 1,606 974
Gross Unrealized Losses    
Less than 12 Months (45) (7)
Over 12 Months 0 0
Total (45) (7)
Commercial Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 3,495 3,456
Over 12 Months 726 253
Total 4,221 3,709
Gross Unrealized Losses    
Less than 12 Months (109) (49)
Over 12 Months (16) (6)
Total (125) (55)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 297 249
Over 12 Months 62 139
Total 359 388
Gross Unrealized Losses    
Less than 12 Months (4) (2)
Over 12 Months (2) (2)
Total (6) (4)
Total U.S. Treasury, Federal agency and other agency securities    
Fair Value    
Less than 12 Months 6,345 7,048
Over 12 Months 2,101 1,411
Total 8,446 8,459
Gross Unrealized Losses    
Less than 12 Months (181) (84)
Over 12 Months (58) (40)
Total (239) (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