Annual report pursuant to Section 13 and 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 2,254 $ 5,545
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 35 61
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 9,679 6,728
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 324 225
Debt Securities, Available-for-sale, Unrealized Loss Position 11,933 12,273
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 359 286
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 141 7,048
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (84)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 7,711 1,416
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (279) (40)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 7,852 8,464
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (281) (124)
Collateralized Mortgage Obligations [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 425 1,660
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,943 4,520
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 198 159
Debt Securities, Available-for-sale, Unrealized Loss Position 6,368 6,180
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 201 178
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 12 2,369
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (26)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 2,004 1,019
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (47) (32)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 2,016 3,388
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (47) (58)
Residential Mortgage Backed Securities [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 259 1,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 319 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9 0
Debt Securities, Available-for-sale, Unrealized Loss Position 578 1,089
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 15 5
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 16 974
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (7)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,457 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (42) 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,473 974
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (42) (7)
Commercial Mortgage Backed Securities [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 10 960
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,573 1,527
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 58 37
Debt Securities, Available-for-sale, Unrealized Loss Position 1,583 2,487
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 58 52
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 3,456
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (49)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 4,041 253
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (186) (6)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 4,041 3,709
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (186) (55)
Other Federal Agencies [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 124 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 0
Debt Securities, Available-for-sale, Unrealized Loss Position 124 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 2 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 113 249
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (2)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 205 139
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (4) (2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 318 388
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (6) (4)
US Government-sponsored Enterprises Debt Securities [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 694 3,737
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9 39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7,959 6,058
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 267 196
Debt Securities, Available-for-sale, Unrealized Loss Position 8,653 9,795
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 276 235
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 141 7,048
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (84)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 7,707 1,411
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (279) (40)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 7,848 8,459
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (281) (124)
Municipal securities    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,425 1,681
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 24 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,602 497
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 54 14
Debt Securities, Available-for-sale, Unrealized Loss Position 3,027 2,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 78 35
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 4 5
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 4 5
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 0
Asset-backed Securities [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 95 127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 117 173
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 15
Debt Securities, Available-for-sale, Unrealized Loss Position 212 300
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 4 $ 16
Corporate debt    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 40  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1  
Debt Securities, Available-for-sale, Unrealized Loss Position 41  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1