Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE SECURITIES AVAILABLE-FOR-SALE SECURITIES - Continuous Unrealized Loss Position (Details)

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AVAILABLE-FOR-SALE SECURITIES AVAILABLE-FOR-SALE SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 6,805 $ 5,545
Over 12 Months 6,368 6,728
Total 13,173 12,273
Gross Unrealized Losses    
Less than 12 Months (170) (61)
Over 12 Months (312) (225)
Total (482) (286)
Federal agencies: Mortgage-backed securities    
Fair Value    
Total   6,180
Gross Unrealized Losses    
Total   (178)
Collateralized Mortgage Obligations [Member]    
Fair Value    
Less than 12 Months 3,217 1,660
Over 12 Months 3,988 4,520
Total 7,205  
Gross Unrealized Losses    
Less than 12 Months (86) (19)
Over 12 Months (218) (159)
Total (304)  
Residential Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 638 1,078
Over 12 Months 12 11
Total 650 1,089
Gross Unrealized Losses    
Less than 12 Months (19) (5)
Over 12 Months 0 0
Total (19) (5)
Commercial Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 285 960
Over 12 Months 1,458 1,527
Total 1,743 2,487
Gross Unrealized Losses    
Less than 12 Months (9) (15)
Over 12 Months (63) (37)
Total (72) (52)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 88 39
Over 12 Months 85 0
Total 173 39
Gross Unrealized Losses    
Less than 12 Months (2) 0
Over 12 Months (3) 0
Total (5) 0
Total U.S. Treasury, Federal agency and other agency securities    
Fair Value    
Less than 12 Months 4,228 3,737
Over 12 Months 5,543 6,058
Total 9,771 9,795
Gross Unrealized Losses    
Less than 12 Months (116) (39)
Over 12 Months (284) (196)
Total (400) (235)
Municipal securities    
Fair Value    
Less than 12 Months 2,306 1,681
Over 12 Months 723 497
Total 3,029 2,178
Gross Unrealized Losses    
Less than 12 Months (49) (21)
Over 12 Months (24) (14)
Total (73) (35)
Asset-backed securities    
Fair Value    
Less than 12 Months 210 127
Over 12 Months 102 173
Total 312 300
Gross Unrealized Losses    
Less than 12 Months (4) (1)
Over 12 Months (4) (15)
Total (8) $ (16)
Corporate debt    
Fair Value    
Less than 12 Months 61  
Over 12 Months 0  
Total 61  
Gross Unrealized Losses    
Less than 12 Months (1)  
Over 12 Months 0  
Total (1)  
Other securities/Sovereign debt    
Fair Value    
Less than 12 Months 0  
Over 12 Months 0  
Total 0  
Gross Unrealized Losses    
Less than 12 Months 0  
Over 12 Months 0  
Total $ 0