v3.26.3
Investment Securities - Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Amortized
Cost Basis $ 2,059 $ 3,149
Gross Unrealized Gains in Other Comprehensive Income 189 225
Gross Unrealized Losses in Other Comprehensive Income (90) (58)
Available-for-Sale, at fair value 2,158 3,316
Accrued Interest Receivable 9 13
Agency    
Debt Securities, Available-for-sale [Line Items]    
Amortized
Cost Basis 1,681 2,726
Gross Unrealized Gains in Other Comprehensive Income 8 16
Gross Unrealized Losses in Other Comprehensive Income (58) (40)
Available-for-Sale, at fair value 1,631 2,702
Accrued Interest Receivable 4 6
Other mortgage-related securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized
Cost Basis 378 423
Gross Unrealized Gains in Other Comprehensive Income 181 209
Gross Unrealized Losses in Other Comprehensive Income (32) (18)
Available-for-Sale, at fair value 527 614
Accrued Interest Receivable $ 5 $ 7