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Investment Securities - Securities in Gross Unrealized Loss Position (Details)
$ in Millions
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 5,068 $ 30,629
Gross Unrealized Loss - Less than 12 Months (50) (2,141)
Fair Value - 12 Months or Longer 62,711 40,544
Gross Unrealized Loss - 12 Months or Longer (9,102) (8,133)
Fair Value - Total 67,779 71,173
Gross Unrealized Loss - Total $ (9,152) $ (10,274)
Number of securities in gross unrealized loss positions | security 2,740 2,840
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 733 $ 2,464
Gross Unrealized Loss - Less than 12 Months 0 (57)
Fair Value - 12 Months or Longer 2,242 448
Gross Unrealized Loss - 12 Months or Longer (49) (33)
Fair Value - Total 2,975 2,912
Gross Unrealized Loss - Total (49) (90)
RMBS, Agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 3,511 23,271
Gross Unrealized Loss - Less than 12 Months (43) (1,809)
Fair Value - 12 Months or Longer 53,987 36,803
Gross Unrealized Loss - 12 Months or Longer (8,407) (7,604)
Fair Value - Total 57,498 60,074
Gross Unrealized Loss - Total (8,450) (9,413)
RMBS, Non-agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 1 14
Gross Unrealized Loss - Less than 12 Months 0 (1)
Fair Value - 12 Months or Longer 13 3
Gross Unrealized Loss - 12 Months or Longer (1) 0
Fair Value - Total 14 17
Gross Unrealized Loss - Total (1) (1)
Total RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 3,512 23,285
Gross Unrealized Loss - Less than 12 Months (43) (1,810)
Fair Value - 12 Months or Longer 54,000 36,806
Gross Unrealized Loss - 12 Months or Longer (8,408) (7,604)
Fair Value - Total 57,512 60,091
Gross Unrealized Loss - Total (8,451) (9,414)
Agency CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 547 4,325
Gross Unrealized Loss - Less than 12 Months (7) (267)
Fair Value - 12 Months or Longer 6,465 3,214
Gross Unrealized Loss - 12 Months or Longer (645) (493)
Fair Value - Total 7,012 7,539
Gross Unrealized Loss - Total (652) (760)
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 276 555
Gross Unrealized Loss - Less than 12 Months 0 (7)
Fair Value - 12 Months or Longer 4 76
Gross Unrealized Loss - 12 Months or Longer 0 (3)
Fair Value - Total 280 631
Gross Unrealized Loss - Total $ 0 $ (10)