Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 5,545 $ 10,687
Over 12 Months, Fair Value 6,728 495
Total, Fair Value 12,273 11,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (61) (222)
Over 12 Months, Unrealized Losses (225) (40)
Total, Unrealized Losses (286) (262)
Collateralized Mortgage Obligations [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 1,660 5,858
Over 12 Months, Fair Value 4,520 21
Total, Fair Value 6,180 5,879
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (19) (150)
Over 12 Months, Unrealized Losses (159) (1)
Total, Unrealized Losses (178) (151)
Commercial MBS    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 960 3,019
Over 12 Months, Fair Value 1,527 21
Total, Fair Value 2,487 3,040
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (15) (39)
Over 12 Months, Unrealized Losses (37) 0
Total, Unrealized Losses (52) (39)
Residential MBS    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 1,078 31
Over 12 Months, Fair Value 11 0
Total, Fair Value 1,089 31
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (5) (1)
Over 12 Months, Unrealized Losses 0 0
Total, Unrealized Losses (5) (1)
Other agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 39 1
Over 12 Months, Fair Value 0 0
Total, Fair Value 39 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses 0 0
Over 12 Months, Unrealized Losses 0 0
Total, Unrealized Losses 0 0
Total Federal agencies and other agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 3,737 8,909
Over 12 Months, Fair Value 6,058 42
Total, Fair Value 9,795 8,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (39) (190)
Over 12 Months, Unrealized Losses (196) (1)
Total, Unrealized Losses (235) (191)
Municipal securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 1,681 1,412
Over 12 Months, Fair Value 497 272
Total, Fair Value 2,178 1,684
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (21) (29)
Over 12 Months, Unrealized Losses (14) (10)
Total, Unrealized Losses (35) (39)
Asset-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 127 361
Over 12 Months, Fair Value 173 179
Total, Fair Value 300 540
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (1) (3)
Over 12 Months, Unrealized Losses (15) (29)
Total, Unrealized Losses (16) (32)
Corporate debt    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 0 4
Over 12 Months, Fair Value 0 0
Total, Fair Value 0 4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses 0 0
Over 12 Months, Unrealized Losses 0 0
Total, Unrealized Losses 0 0
Other securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 0 1
Over 12 Months, Fair Value 0 2
Total, Fair Value 0 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses 0 0
Over 12 Months, Unrealized Losses 0 0
Total, Unrealized Losses $ 0 $ 0