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, 2019
Dec. 31, 2018
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 3,323 $ 2,254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (21) (35)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,041 9,679
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (30) (324)
Debt Securities, Available-for-sale, Unrealized Loss Position 5,364 11,933
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (51) (359)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 678 141
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) (2)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 112 7,711
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2) (279)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 790 7,852
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (3) (281)
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 1,206 425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 519 5,943
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (8) (198)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,725 6,368
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (18) (201)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 218 12
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 112 2,004
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2) (47)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 330 2,016
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (3) (47)
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 1,169 259
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3) (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 9 319
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (9)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,178 578
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (3) (15)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 317 16
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 1,457
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (42)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 317 1,473
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 (42)
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 472 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 272 1,573
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2) (58)
Debt Securities, Available-for-sale, Unrealized Loss Position 744 1,583
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (4) (58)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 81 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 0 4,041
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (186)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 81 4,041
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 (186)
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 86 0
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 0 124
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 86 124
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1) (2)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 58 113
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (2)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 205
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (4)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 58 318
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 0 (6)
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 2,933 694
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (16) (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 800 7,959
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (10) (267)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,733 8,653
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (26) (276)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 674 141
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) (2)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 112 7,707
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2) (279)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 786 7,848
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (3) (281)
Municipal securities    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 273 1,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (4) (24)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,204 1,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (19) (54)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,477 3,027
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (23) (78)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 4 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 0 4
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 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 116 95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) (2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 37 117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1) (2)
Debt Securities, Available-for-sale, Unrealized Loss Position 153 212
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2) (4)
Corporate debt    
Investment securities and other securities disclosure [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1 40
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 0 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (1)
Debt Securities, Available-for-sale, Unrealized Loss Position 1 41
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 0 $ (1)