Quarterly report pursuant to Section 13 or 15(d)

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

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INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,721 $ 3,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 53 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,223 2,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (48) (30)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,944 5,364
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (101) (51)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 150 678
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 4 112
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 154 790
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 1 3
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 94 1,206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 519
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (8)
Debt Securities, Available-for-sale, Unrealized Loss Position 94 1,725
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1) (18)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 218
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 112
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 0 330
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 3
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 0 1,169
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 7 1,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0 (3)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 78 317
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 0 0
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 78 317
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 0
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 0 472
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4 272
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (2)
Debt Securities, Available-for-sale, Unrealized Loss Position 4 744
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0 (4)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 72 81
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 4 0
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 76 81
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 1 0
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 50 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 50 86
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0 (1)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 58
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 0 0
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 0 58
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 0
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 144 2,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 11 800
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (10)
Debt Securities, Available-for-sale, Unrealized Loss Position 155 3,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1) (26)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 150 674
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 4 112
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 154 786
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 1 3
Municipal securities    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,102 273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,178 1,204
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (45) (19)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,280 1,477
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (72) (23)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 4
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 0 0
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 0 4
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 439 116
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 24 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 34 37
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3) (1)
Debt Securities, Available-for-sale, Unrealized Loss Position 473 153
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (27) (2)
Corporate Debt Securities [Member]    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 36 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 36 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (1) $ 0