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
Mar. 31, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 6,804 $ 5,545
Over 12 Months 6,345 6,728
Total 13,149 12,273
Gross Unrealized Losses    
Less than 12 Months (145) (61)
Over 12 Months (271) (225)
Total (416) (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 3,291 1,660
Over 12 Months 4,027 4,520
Total 7,318  
Gross Unrealized Losses    
Less than 12 Months (71) (19)
Over 12 Months (188) (159)
Total (259)  
Residential Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 648 1,078
Over 12 Months 11 11
Total 659 1,089
Gross Unrealized Losses    
Less than 12 Months (16) (5)
Over 12 Months 0 0
Total (16) (5)
Commercial Mortgage Backed Securities [Member]    
Fair Value    
Less than 12 Months 322 960
Over 12 Months 1,469 1,527
Total 1,791 2,487
Gross Unrealized Losses    
Less than 12 Months (9) (15)
Over 12 Months (54) (37)
Total (63) (52)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 107 39
Over 12 Months 69 0
Total 176 39
Gross Unrealized Losses    
Less than 12 Months (1) 0
Over 12 Months (2) 0
Total (3) 0
Total U.S. Treasury, Federal agency and other agency securities    
Fair Value    
Less than 12 Months 4,368 3,737
Over 12 Months 5,576 6,058
Total 9,944 9,795
Gross Unrealized Losses    
Less than 12 Months (97) (39)
Over 12 Months (244) (196)
Total (341) (235)
Municipal securities    
Fair Value    
Less than 12 Months 2,182 1,681
Over 12 Months 623 497
Total 2,805 2,178
Gross Unrealized Losses    
Less than 12 Months (45) (21)
Over 12 Months (22) (14)
Total (67) (35)
Asset-backed securities    
Fair Value    
Less than 12 Months 240 127
Over 12 Months 144 173
Total 384 300
Gross Unrealized Losses    
Less than 12 Months (3) (1)
Over 12 Months (5) (15)
Total (8) $ (16)
Corporate debt    
Fair Value    
Less than 12 Months 14  
Over 12 Months 0  
Total 14  
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 2  
Total 2  
Gross Unrealized Losses    
Less than 12 Months 0  
Over 12 Months 0  
Total $ 0