v3.26.1
Investments - Schedule of Residential Mortgage-Backed Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Summary of Investment Holdings [Line Items]    
Amortized Cost $ 55,707 $ 53,961
Allowance for Credit Loss 17 11
Gross Unrealized Gains 337 592
Gross Unrealized Losses 4,079 3,751
Fair Value 51,948 50,791
Non-agency RMBS    
Summary of Investment Holdings [Line Items]    
Amortized Cost 338 310
Allowance for Credit Loss 1 4
Gross Unrealized Gains 20 23
Gross Unrealized Losses 17 15
Fair Value 340 314
Non-agency RMBS | Prime    
Summary of Investment Holdings [Line Items]    
Amortized Cost 310 280
Allowance for Credit Loss 1 2
Gross Unrealized Gains 2 3
Gross Unrealized Losses 14 13
Fair Value 297 268
Non-agency RMBS | Alt-A    
Summary of Investment Holdings [Line Items]    
Amortized Cost 21 23
Allowance for Credit Loss 0 2
Gross Unrealized Gains 14 16
Gross Unrealized Losses 3 2
Fair Value 32 35
Non-agency RMBS | Subprime    
Summary of Investment Holdings [Line Items]    
Amortized Cost 7 7
Allowance for Credit Loss 0 0
Gross Unrealized Gains 4 4
Gross Unrealized Losses 0 0
Fair Value $ 11 $ 11