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Investment Securities - Securities in Gross Unrealized Loss Position (Details)
$ in Millions
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 3,724 $ 15,189
Gross Unrealized Loss - Less than 12 Months (8) (194)
Fair Value - 12 Months or Longer 55,080 55,326
Gross Unrealized Loss - 12 Months or Longer (7,553) (9,927)
Fair Value - Total 58,804 70,515
Gross Unrealized Loss - Total $ (7,561) $ (10,121)
Number of securities in gross unrealized loss positions | security 2,330 2,740
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months $ 712 $ 1,724
Gross Unrealized Loss - Less than 12 Months (1) (6)
Fair Value - 12 Months or Longer 1,204 931
Gross Unrealized Loss - 12 Months or Longer (3) (3)
Fair Value - Total 1,916 2,655
Gross Unrealized Loss - Total (4) (9)
RMBS, Agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 2,014 11,324
Gross Unrealized Loss - Less than 12 Months (5) (178)
Fair Value - 12 Months or Longer 48,313 48,707
Gross Unrealized Loss - 12 Months or Longer (7,162) (9,349)
Fair Value - Total 50,327 60,031
Gross Unrealized Loss - Total (7,167) (9,527)
RMBS, Non-agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 2 3
Gross Unrealized Loss - Less than 12 Months 0 0
Fair Value - 12 Months or Longer 8 11
Gross Unrealized Loss - 12 Months or Longer 0 (1)
Fair Value - Total 10 14
Gross Unrealized Loss - Total 0 (1)
Total RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 2,016 11,327
Gross Unrealized Loss - Less than 12 Months (5) (178)
Fair Value - 12 Months or Longer 48,321 48,718
Gross Unrealized Loss - 12 Months or Longer (7,162) (9,350)
Fair Value - Total 50,337 60,045
Gross Unrealized Loss - Total (7,167) (9,528)
Agency CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 466 700
Gross Unrealized Loss - Less than 12 Months (2) (7)
Fair Value - 12 Months or Longer 5,555 5,677
Gross Unrealized Loss - 12 Months or Longer (388) (574)
Fair Value - Total 6,021 6,377
Gross Unrealized Loss - Total (390) (581)
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value - Less than 12 Months 530 1,438
Gross Unrealized Loss - Less than 12 Months 0 (3)
Fair Value - 12 Months or Longer 0 0
Gross Unrealized Loss - 12 Months or Longer 0 0
Fair Value - Total 530 1,438
Gross Unrealized Loss - Total $ 0 $ (3)