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Available-for-Sale and Held-to-Maturity Securities (Details - OTTI) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 3,329  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7,981  
Debt Securities, Available-for-sale, Unrealized Loss Position 11,310  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (35)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (279)  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (314)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 4,654
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   8,492
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   13,146
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (23)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (241)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (264)
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,675 10,952
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 13,740 6,260
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 17,415 17,212
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (34) (83)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (389) (147)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (423) (230)
Agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,945  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7,826  
Debt Securities, Available-for-sale, Unrealized Loss Position 10,771  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (34)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (271)  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (305)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   4,638
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   8,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   12,665
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (23)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (224)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (247)
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 2,802 9,982
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 11,587 4,906
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 14,389 14,888
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (31) (78)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (332) (115)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (363) (193)
Agency Debentures [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 383  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 116  
Debt Securities, Available-for-sale, Unrealized Loss Position 499  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (6)  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (7)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   283
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   283
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (12)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (12)
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 776 597
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 666 9
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,442 606
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, Accumulated Loss (14) 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (16) (2)
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   147
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   147
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (4)
Agency Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 30  
Debt Securities, Available-for-sale, Unrealized Loss Position 30  
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, Accumulated Loss (2)  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   24
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   33
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (1)
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 97 373
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,487 1,345
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,584 1,718
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) (3)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (43) (32)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (44) (35)
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 9  
Debt Securities, Available-for-sale, Unrealized Loss Position 9  
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, Accumulated Loss 0  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   11
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   0
Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0  
Debt Securities, Available-for-sale, Unrealized Loss Position 1  
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, Accumulated Loss 0  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 0  
Equity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ 0