v3.26.1
Investments - Schedule of Residential Mortgage-Backed Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Summary of Investment Holdings [Line Items]    
Amortized Cost $ 59,349 $ 53,961
Allowance for Credit Loss 24 11
Gross Unrealized Gains 331 592
Gross Unrealized Losses 3,914 3,751
Fair Value 55,742 50,791
Non-agency RMBS    
Summary of Investment Holdings [Line Items]    
Amortized Cost 305 310
Allowance for Credit Loss 1 4
Gross Unrealized Gains 19 23
Gross Unrealized Losses 20 15
Fair Value 303 314
Non-agency RMBS | Prime    
Summary of Investment Holdings [Line Items]    
Amortized Cost 250 280
Allowance for Credit Loss 1 2
Gross Unrealized Gains 2 3
Gross Unrealized Losses 16 13
Fair Value 235 268
Non-agency RMBS | Alt-A    
Summary of Investment Holdings [Line Items]    
Amortized Cost 18 23
Allowance for Credit Loss 0 2
Gross Unrealized Gains 13 16
Gross Unrealized Losses 4 2
Fair Value 27 35
Non-agency RMBS | Subprime    
Summary of Investment Holdings [Line Items]    
Amortized Cost 37 7
Allowance for Credit Loss 0 0
Gross Unrealized Gains 4 4
Gross Unrealized Losses 0 0
Fair Value $ 41 $ 11