v3.26.1
Investment Securities - Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Amortized
Cost Basis $ 2,776 $ 3,149
Gross Unrealized Gains in Other Comprehensive Income 200 225
Gross Unrealized Losses in Other Comprehensive Income (64) (58)
Available-for-Sale, at fair value 2,912 3,316
Accrued Interest Receivable 11 13
Agency    
Debt Securities, Available-for-sale [Line Items]    
Amortized
Cost Basis 2,371 2,726
Gross Unrealized Gains in Other Comprehensive Income 12 16
Gross Unrealized Losses in Other Comprehensive Income (45) (40)
Available-for-Sale, at fair value 2,338 2,702
Accrued Interest Receivable 5 6
Other mortgage-related securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized
Cost Basis 405 423
Gross Unrealized Gains in Other Comprehensive Income 188 209
Gross Unrealized Losses in Other Comprehensive Income (19) (18)
Available-for-Sale, at fair value 574 614
Accrued Interest Receivable $ 6 $ 7