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Investment Securities - Securities in Gross Unrealized Loss Position (Details)
$ in Millions
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 6,551 $ 5,068
Gross Unrealized Loss - Less than 12 Months (15) (50)
Fair Value - 12 Months or Longer 59,724 62,711
Gross Unrealized Loss - 12 Months or Longer (7,593) (9,102)
Fair Value - Total 66,275 67,779
Gross Unrealized Loss - Total $ (7,608) $ (9,152)
Number of securities in gross unrealized loss positions | security 2,500 2,740
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 3,772 $ 733
Gross Unrealized Loss - Less than 12 Months (4) 0
Fair Value - 12 Months or Longer 1,331 2,242
Gross Unrealized Loss - 12 Months or Longer (9) (49)
Fair Value - Total 5,103 2,975
Gross Unrealized Loss - Total (13) (49)
RMBS, Agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 1,807 3,511
Gross Unrealized Loss - Less than 12 Months (10) (43)
Fair Value - 12 Months or Longer 52,413 53,987
Gross Unrealized Loss - 12 Months or Longer (7,120) (8,407)
Fair Value - Total 54,220 57,498
Gross Unrealized Loss - Total (7,130) (8,450)
RMBS, Non-agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 4 1
Gross Unrealized Loss - Less than 12 Months 0 0
Fair Value - 12 Months or Longer 10 13
Gross Unrealized Loss - 12 Months or Longer 0 (1)
Fair Value - Total 14 14
Gross Unrealized Loss - Total 0 (1)
Total RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 1,811 3,512
Gross Unrealized Loss - Less than 12 Months (10) (43)
Fair Value - 12 Months or Longer 52,423 54,000
Gross Unrealized Loss - 12 Months or Longer (7,120) (8,408)
Fair Value - Total 54,234 57,512
Gross Unrealized Loss - Total (7,130) (8,451)
Agency CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 192 547
Gross Unrealized Loss - Less than 12 Months (1) (7)
Fair Value - 12 Months or Longer 5,966 6,465
Gross Unrealized Loss - 12 Months or Longer (464) (645)
Fair Value - Total 6,158 7,012
Gross Unrealized Loss - Total (465) (652)
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 776 276
Gross Unrealized Loss - Less than 12 Months 0 0
Fair Value - 12 Months or Longer 4 4
Gross Unrealized Loss - 12 Months or Longer 0 0
Fair Value - Total 780 280
Gross Unrealized Loss - Total $ 0 $ 0