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
Sep. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 5,085 $ 5,545
Over 12 Months 7,792 6,728
Total 12,877 12,273
Gross Unrealized Losses    
Less than 12 Months (148) (61)
Over 12 Months (416) (225)
Total (564) (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 2,286 1,660
Over 12 Months 4,632 4,520
Total 6,918  
Gross Unrealized Losses    
Less than 12 Months (77) (19)
Over 12 Months (290) (159)
Total (367)  
Residential Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 542 1,078
Over 12 Months 70 11
Total 612 1,089
Gross Unrealized Losses    
Less than 12 Months (23) (5)
Over 12 Months (3) 0
Total (26) (5)
Commercial Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 109 960
Over 12 Months 1,594 1,527
Total 1,703 2,487
Gross Unrealized Losses    
Less than 12 Months (4) (15)
Over 12 Months (76) (37)
Total (80) (52)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 80 39
Over 12 Months 72 0
Total 152 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 3,017 3,737
Over 12 Months 6,368 6,058
Total 9,385 9,795
Gross Unrealized Losses    
Less than 12 Months (106) (39)
Over 12 Months (372) (196)
Total (478) (235)
Municipal securities    
Fair Value    
Less than 12 Months 1,846 1,681
Over 12 Months 1,278 497
Total 3,124 2,178
Gross Unrealized Losses    
Less than 12 Months (39) (21)
Over 12 Months (38) (14)
Total (77) (35)
Asset-backed securities    
Fair Value    
Less than 12 Months 157 127
Over 12 Months 146 173
Total 303 300
Gross Unrealized Losses    
Less than 12 Months (3) (1)
Over 12 Months (6) (15)
Total (9) $ (16)
Corporate debt    
Fair Value    
Less than 12 Months 65  
Over 12 Months 0  
Total 65  
Gross Unrealized Losses    
Less than 12 Months 0  
Over 12 Months 0  
Total 0  
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