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Future Policy Benefits - Schedule of Reconciliation of Net FPB to the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Activity
Future policy benefits	$ 9,463	$ 8,749
Traditional Life
Liability for Future Policy Benefit, Activity
Future policy benefits	1,303	1,302
Immediate annuities
Liability for Future Policy Benefit, Activity
Future policy benefits	1,289	1,297
Deferred profit liability	92	90	$ 87
PRT
Liability for Future Policy Benefit, Activity
Future policy benefits	6,772	6,054
Immediate annuities DPL
Liability for Future Policy Benefit, Activity
Deferred profit liability	92	90
PRT DPL
Liability for Future Policy Benefit, Activity
Deferred profit liability	$ 7	$ 6

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