Annual report pursuant to Section 13 and 15(d)

HELD-TO-MATURITY SECURITIES - Schedule of Continuous Unrealized Loss Position (Details)

v3.8.0.1
HELD-TO-MATURITY SECURITIES - Schedule of Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value $ 7,048 $ 3,275
Over Twelve Months, Fair Value 1,416 186
Fair Value 8,464 3,461
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses (84) (35)
Over 12 Months, Unrealized Losses (40) (7)
Unrealized Losses (124) (42)
Commercial MBS    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value 3,456 352
Over Twelve Months, Fair Value 253 0
Fair Value 3,709 352
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses (49) (5)
Over 12 Months, Unrealized Losses (6) 0
Unrealized Losses (55) (5)
Residential MBS    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value 974 20
Over Twelve Months, Fair Value 0 0
Fair Value 974 20
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses (7) 0
Over 12 Months, Unrealized Losses 0 0
Unrealized Losses (7) 0
Collateralized Mortgage Obligations [Member]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value 2,369 2,483
Over Twelve Months, Fair Value 1,019 186
Fair Value 3,388 2,669
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses (26) (26)
Over 12 Months, Unrealized Losses (32) (7)
Unrealized Losses (58) (33)
Other agencies    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value 249 414
Over Twelve Months, Fair Value 139 0
Fair Value 388 414
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses (2) (4)
Over 12 Months, Unrealized Losses (2) 0
Unrealized Losses (4) (4)
Total Federal agencies and other agencies    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value 7,048 3,269
Over Twelve Months, Fair Value 1,411 186
Fair Value 8,459 3,455
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses (84) (35)
Over 12 Months, Unrealized Losses (40) (7)
Unrealized Losses (124) (42)
Municipal securities    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value:    
Less Than Twelve Months, Fair Value 0 6
Over Twelve Months, Fair Value 5 0
Fair Value 5 6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss:    
Less than 12 Months, Unrealized Losses 0 0
Over 12 Months, Unrealized Losses 0 0
Unrealized Losses $ 0 $ 0